1660+ Biology (GK) Solved MCQs

401.

Animals living in the three trunks are known as -

A. Arboreal
B. Voiant
C. Amphibious
D. Aquaticx
Answer» A. Arboreal
Explanation: Arboreal means living in trees. In every habitat in which trees are present, animals have evolved to move in them. Some animals may only scale trees occasionally, while others are exclusively arboreal. These habitats pose numerous mechanical challenges to animals moving through them, leading to a variety of anatomical, behavioral and ecological consequences. Arboreal species have behaviors specialized for moving in their habitats, most prominently in terms of posture and gait.
402.

The discoverer of pencillin was -

A. Lord Lister
B. Alexander Fleming
C. Karl Landsteiner
D. Walter Reed
Answer» B. Alexander Fleming
Explanation: 0
403.

Blood groups were discovered by -

A. Altmann
B. Landsteiner
C. Losch
D. Ronald Ross
Answer» B. Landsteiner
Explanation: Karl Landsteiner was an Austrian biologist and physician. He is noted for having first distinguished the main blood groups in 1900, having developed the modern system of classification of blood groups from his identification of the presence of agglutinins in the blood, and having identified, with AlexanderS. Wiener, the Rhesus factor, in 1937, thus enabling physicians to transfuse blood without endangering the patient's life. With Constantin Levaditi and Erwin Popper, he discovered the polio virus, in 1909.
404.

The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is -

A. 4 - 6
B. 2 - 4
C. 8 - 10
D. 12 - 16
Answer» A. 4 - 6
Explanation: Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is considered a primary indicator when assessing the suitability of surface waters to support aquatic life. For maintenance of aquatic health, dissolved oxygen concentrations should approach saturation - that concentration which is in equilibrium with the partial pressure of atmospheric oxygen.
405.

An example of false fruit is –

A. Apple
B. Guava
C. Mango
D. Tomato
Answer» A. Apple
Explanation: An accessory fruit (sometimes called false fruit, spurious fruit, pseudofruit, or pseudocarp) is a fruit in which some of the flesh is derived not from the ovary but from some adjacent tissue exterior to the carpel. Examples of accessory tissue are the receptacle of strawberries, figs, or mulberries, and the calyx of Gaultheria procurribens or Syzygium jambos. Pomes, such as apples and pears, are also accessory fruits, with much of the fruit flesh derived from a hypanthium. Fruit with fleshy seeds, such as pomegranate or mamoncillo, are not considered to be accessory fruit.
406.

The green colour of the leaves is due to the presence of -

A. Proteins
B. Lipids
C. Chlorophyll
D. Carbohydrates
Answer» C. Chlorophyll
Explanation: The green color in leaves is caused by the presence of a compound called "chlorophyll," which the plant produces to do photosynthesis, which is how plants get energy from sunlight. The purpose of chlorophyll is to assist the plant in making food for itself by utilizing energy from sunlight and nutrients from the soil. The chlorophyll is green because it absorbs red and blue wavelengths of light — and so green is not absorbed and is reflected, making the plant look green to our eyes.
407.

The edible part of an onion is -

A. Modified root
B. Aerial flower
C. Aerial stem
D. Fleshy leaves
Answer» D. Fleshy leaves
Explanation: Edible plant stems are one part of plants that are eaten by humans. Most plants are made up of roots, stems, leaves, flowers, buds and produce fruits containing seeds. The edible portion in an onion is swollen leaves with a bit of stem. They are bulbs which, like garlic and leeks, are modified stems in which theprimary storage tissue is expanded leaf bases. They come in white, yellow, and red varieties.
408.

Haemophilia is mostly associated with

A. Labourers
B. Royal families
C. Miners
D. Sportsmen
Answer» B. Royal families
Explanation: Hemophilia is a group of hereditary genetic disorders that impair the body's ability to control blood clotting or coagulation, which is used to stop bleeding when a blood vessel is broken. It has been associated with royal families due to inbreeding, and is sometimes called the 'Royal Disease,' Queen Victoria of England had this disease. However, it can occur in any family as a result of genetic mutation or a change in the genetic code.
409.

Approximately how many times each day, do our heart valves open and close normally?

A. 10,000 times
B. 1,00,000 times
C. 1,50,000 times
D. 2,00,000 times
Answer» B. 1,00,000 times
Explanation: The opening and closing of heart valves is known as a heartbeat. The average human heart beats 100,000 times per day.
410.

Normal blood pressure of man is -

A. 80/120 mm
B. 90/140 mm Hg
C. 120/160 mm Hg
D. 85/120 mm Hg
Answer» A. 80/120 mm
Explanation: Normal blood pressure is considered to be at or below 120 over 80 (120/80). Normally, blood pressures are usually categorized into three groups: low (90/60 or*lower), high ( 140 / 90 or higher), and normal (values above 90/60 and below 130/80).
411.

To which group of blood an universal recipient belongs?

A. A group
B. B group
C. O group
D. AB group
Answer» D. AB group
Explanation: Type AB+ is the universal recipient. Although those with AB blood type may be referred to as universal recipients, in actuality, type Al3+ blood is that of the - universal recipient, whereas type AB- is not. This is an important distinction to make.
412.

The normal body temperature of human beings is -

A. 96.4 °F
B. 97.4 °F
C. 98.4 °F
D. 99.4 °F
Answer» C. 98.4 °F
Explanation: The normal core body temperature of a healthy, resting adult human being is stated to be at 98.6 degrees fahrenheit or 37.0 degrees celsius. Though the body temperature measured on an individual can vary, a healthy human body can maintain a fairly consistent body temperature that is around the mark of 37 degrees celsius. The normal range of human body temperature varies due to an individual's metabolism rate, the higher (faster) it is the higher the normal body temperature or the slower the metabolic rate the lower the normal body temperature.
413.

Normal fasting blood sugar level per 100 ml. of blood in man is -

A. 30 - 50 mg
B. 50 - 70 mg
C. 80 -100 mg
D. 120 -140 mg
Answer» C. 80 -100 mg
Explanation: The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. Glucose levels are usually lowest in the morning, before the first meal of the day (termed the fasting level"), and rise after meals for an hour or two by a few millimolar.
414.

The vector of disease sleeping sickness is

A. sand-fly
B. house-fly
C. fruit-fly
D. tse-tse fly
Answer» D. tse-tse fly
Explanation: Human African tiypanosomia.sis, sleeping sickness, African lethargy, or Congo trypanosomiasis is a parasitic disease of people and animals, caused by protozoa of the species Trypanosoma. brucei and transmitted by the tsetse fly. It results in swelling of the brain. The disease is endemic in some regions of sub- Saharan Africa, covering areas in about 37 countries containing more than 60 million people. An estimated 50,000 to 70,000 people are currently infected, the number having declined somewhat in recent years.
415.

The animal which can tolerate more summer heat is -

A. Buffalo
B. Cow
C. Goat
D. Donkey
Answer» C. Goat
Explanation: Some livestock (and people) tolerate heat better than others. Sheep and goats tend to be less susceptible to heat stress than swine, cattle, llamas, and alpacas. Hair sheepusually tolerate heat better than wooled sheep. This is why they are often used for training and trialing herding dogs. Fat-tailed sheep are also more heat tolerant. The European sheep breeds are usually the least heat-adaptive because they tend to have shorter bodies and legs, short, thick ears, tight skin, and dense fleeces.
416.

Ringworm is a            disease.

A. Bacterial
B. Protozoan
C. Viral
D. Fm gal
Answer» D. Fm gal
Explanation: Dermatophytosis or ringworm is a clinical condition caused by fungal infection of the skin in humans, pets such as cats, and domesticated animals such as sheep and cattle. The term "ringworm" is a misnomer, since the condition is caused by fungi of several different species and not by parasitic worms. The fungi that cause parasitic infection (dermatophytes) feed on keratin, the material found in the outer layer of skin, hair, and nails. These fungi thrive on skin that is warm and moist, but may also survive directly on the outsides of hair shafts or in their interiors. In pets, the fungus responsible for the disease survives in skin and on the outer surface of hairs.
417.

Pituitary gland is situated in -

A. the base of the heart
B. the base of the brain
C. the neck
D. the abdomen
Answer» B. the base of the brain
Explanation: Pituitary gland or hypophysis, is an endocrine gland about the size of a pea and weighing 0.5 grams (0.018 oz) in humans. It is not a part of the brain. It is aprotrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity (sena turcica) covered by a dural fold (diaphragma sellae). The pituitary is functionally connected to the hypothalamus by the median eminence via a small tube called the infundibular stern (Pituitary stalk).
418.

The percentage of Plasma in the total blood volume in human beings is about :

A. 45
B. 50
C. 55
D. 60
Answer» C. 55
Explanation: Blood plasma is a yellowish colored liquid component of blood that normally holds the blood cells in whole blood. It makes up about 55% of the body's total blood volume.
419.

Both erythrocytes and leucocytes are formed in the             .

A. Bone marrow
B. Thymus
C. Arterial walls
D. Lymph nodes
Answer» A. Bone marrow
Explanation: Leukocytes are immune cells that protect your body from infection, and they are found throughout your body, including your blood. Just like erythrocytes, leukocytes are made in the bone marrow.
420.

Tetanus is caused by -

A. Clostridium
B. Virus
C. Bacteriophage
D. Salmonella
Answer» A. Clostridium
Explanation: Tetanus s a medical condition characterized by a prolonged contraction of skeletal muscle fibers. The primary symptoms are caused by tetanospasmin, a neurotoxin produced by the Gram-positive, rodshaped, obligate anaerobic bacterium Clostridium tetani which is a rod-shaped, anaerobic bacterium of the genus species Clostridium. C. tetani is found as spores in soil or in the gastrointestinal tract of animals. C. tetani produces a potent biological toxin, tetanospasmin, and is the causative agent of tetanus, a disease characterized by painfulmuscular spasms that can lead to respiratory failure and, in up to 40% of cases, death.
421.

Which of the following organisms is most likely to produce green-house gases such as nitrous oxide and methane?

A. Fungi
B. Earthworm
C. Bacteria
D. Green plants
Answer» D. Green plants
Explanation: When it comes to greenhouse gases many of us think first of CO2. But a large proportion of global greenhouse gas emissions are actually other gases, such as N2O (nitrous oxide) and CH4 (methane). The emission of methane and nitrous oxide is largely the result of agricultural activities; nitrous oxide from fertilisers and methane mostly from cows. In peat pasture areas these emissions are particularly prevalent.
422.

Which of the following is a fish?

A. Silverfish
B. Starfish
C. Dogfish
D. Cuttlefish
Answer» C. Dogfish
Explanation: The spiny dogfish shark (Squalus acanthias) is the most common shark and travels in schools. They are called dogfish because they travel and hunt in packs. They also migrate in schools, following cool waters. The spiny dogfish shark is found worldwide in temperate and subarctic waters, in the temperate and subarctic latitudes of the North Atlantic and North Pacific oceans. These sharks have even been found in the Black sea and Mediterranean sea.
423.

Which one of the following techniques can be used to establish the paternity of a child?

A. Protein analysis
B. Chromosome counting
C. Quantitative analysis of DNA
D. DNA finger printing
Answer» D. DNA finger printing
Explanation: Paternity law refers to body of law underlying legal relationship between a father and his biological or adopted children and deals with the rights and obligations of both the father and the child to each other as well as to others.
424.

Many Fungi belonging to the general Microporum Trichophyton and Epidermophyton are responsible for

A. Filarial
B. Cancer
C. Ringworms
D. AIDS
Answer» C. Ringworms
Explanation: Ringworm often spreads by direct skin-to-skin contact with an infected person or animal.
425.

In man, the normal number of chromosomes is -

A. 42
B. 44
C. 46
D. 48
Answer» C. 46
Explanation: Chromosomes are the structures that hold our genes. Genes are the individual instructions that tell our bodies how to develop and function; they govern our physical and medical characteristics, such as hair color, blood type and susceptibility to disease. The typical number of chromosomes in a human cell is 46 - two pairs of 23 - holding an estimated 25,000 genes. One set of 23 chromosomes is inherited from the biological mother (from the egg), and the other set is inherited from the biological father (from the sperm).
426.

Scurvy is a disease which is caused due to the deficiency of vitamin.

A. A
B. K
C. C
D. Byg
Answer» C. C
Explanation: Scurvy is a condition where an individual has a vitamin C (ascorbic acid) deficiency. Scurvy often presents itself initially as symptoms of malaise and lethargy, followed by formation of spots on the skin, spongy gums, and bleeding from the mucous membranes. Spots are most abundant on the thighs and legs, and a person with the ailment looks pale, feels depressed, and is partially immobilized. As scurvy advances, there can be open, suppurating wounds, loss of teeth, jaundice, fever, neuropathy and death.
427.

Which are the largest fixator of solar energy -

A. Bacteria
B. Protozoa
C. Fungi
D. Green plants
Answer» D. Green plants
Explanation: Ecological productivity refers to the primary fixation of solar energy by plants and the subsequent use of that fixed energy by plant-eating herbivores, animal-eating carnivores, and the detritivores that feed upon dead biomass. Ecologists refer to the productivity of green plants as primary productivity.
428.

Study of field crops is called -

A. Pomology
B. Agronomy
C. Olericulture
D. Floriculture
Answer» B. Agronomy
Explanation: OlerictiMire is the science of vegetable growing, dealing with the culture of non-woody (herbaceous) plants for food. The Pomo is a name for between five and seven different Native American groups with similar cultures but very different languages. Agronomyis the science and technology of producing and using plants for food, fuel, fiber, and reclamation. Agronomy encompasses work in the areas of plant genetics, plant physiology, meteorology, and soil science. Agronomy is the application of a combination of sciences like biology, chemistry, economics, ecology, earth science, and genetics.
429.

Locked jaw disorder is the other name of the disease -

A. Tetanus
B. Muscular disorder
C. Typhoid
D. Filariasis
Answer» A. Tetanus
Explanation: Locked jaw syndrome is a disorder that is related to our jaw joint. It causes severe pain and sometimes cannot open the mouth. Tetanus, commonly called locked jaw, is a bacterial disease that affects the nervous system. Persons who have not been vaccinated adequately against tetanus are the most likely to get the disease. Tetanus occurs more Often in older people who have not received adequate booster doses of vaccine and in agricultural workers where Contact with animal manure is more likely.
430.

Excretory products of mammalian embryo are eliminated out by -

A. Placenta
B. Amniotic fluid
C. Allantois
D. Ureter
Answer» A. Placenta
Explanation: The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. 'True" placentas are a defining characteristic of eutherian or "placental" mammals, but are also found in some snakes and lizards with yawing levels of development up to mammalian levels.
431.

Who among the following analysed DNA for the first time?

A. Arthur Cornberg
B. Hargobind Khurana
C. M. W. Nirenberg
D. Watson and Krick
Answer» D. Watson and Krick
Explanation: James D Watson and Fracis Crick, the two scientists who discovered the structure of DNA in 1953. Watson and Crick took a crucial conceptual step, suggesting the molecule was made of two chains of nucleotides, each in a helix as Franklin had found, but one going up and the other going down. Crick had just learned of Chargaffs findings about base pairs in the summer of 1952. He added that to the model, so that matching base pairs interlocked in the middle of the double helix to keep the distance between the chains constant.
432.

Virus contains -

A. Protein and lipid
B. Nucleic acid and protein
C. Lipid and carbohydrate
D. Carbohydrate and nucleic acid
Answer» A. Protein and lipid
Explanation: Virus particles (known as virions) consist of two or three parts: the genetic material made from either DNA or RNA, long molecules that carry genetic information, a protein coat that protects these genes, and in some cases an envelope of lipids that surrounds the protein coat when they are outside a cell. The shapes of viruses range from simple helical and icosahedra forms to more complex structures.
433.

By which the sex of a child is determined before birth?

A. Sperms of father
B. Foetus of mother
C. Both (1) and (2)
D. Nutrition of mother
Answer» B. Foetus of mother
Explanation: The gender of the baby can be ascertained accurately after more or less than seven weeks of pregnancy. During this period ofpregnancy, the fetal DNA is sufficiently found in the mother's blood. Thus, identifying the fetus gender through prenatal gender testing is easier.
434.

AIDS virus has –

A. single-stranded RNA
B. double-stranded RNA
C. single-stranded DNA
D. double-stranded DNA
Answer» A. single-stranded RNA
Explanation: AIDS viruses have single stranded RNA. It is composed of two copies of positive single-stranded RNA that codes for the virus's nine genes enclosed by a conical capsid composed of 2,000 copies of the viral protein. The single-stranded RNA is tightly bound to nucleocapsid proteins.
435.

ECG is done to diagnose an ailment connected with?

A. Kidney
B. Heart
C. Brain
D. Blood
Answer» B. Heart
Explanation: ECG stands for electrocardiogram and it is commonly used to detect abnormal heart rhythms and to investigate the cause of chest pains.
436.

Process of digestion is helped by -

A. Enzyme
B. Hormone
C. Mineral
D. Vitamin
Answer» A. Enzyme
Explanation: Enzymes are large biological molecules responsible for the thousands of chemical inter-conversions that sustain life. They are highly selective catalysts, greatly accelerating both the rate and specificity of metabolic reactions, from the digestion of food to the synthesis of DNA. Most enzymes are proteins, although some catalytic RNAmolecules have been identified. Enzymes such as amylases and proteases break down large molecules (starch or proteins, respectively) into smaller ones, so they can be absorbed by the intestines.
437.

Glaucoma is a disease of the -

A. Skin
B. Lungs
C. Liver
D. Eyes
Answer» D. Eyes
Explanation: Glaucoma is an eye disease in which the optic nerve is damaged in a characteristic pattern. This can permanently damage vision in the affected eye(s) and lead to blindness if left untreated. It is normally associated with increased fluid pressure in the eye (aqueous humour). The term "ocular hypertension" is used for people with consistently raised intraocular pressure (MP) without any associated optic nerve damage. Conversely; the term 'normal tension' or slow tension' glaucoma is used for those with optic nerve damage and associated visual field loss, but normal or low TOP.
438.

The chemical used for destroying Fungi in water tanks is -

A. Copper sulphate
B. Magnesium sulphate
C. Zinc sulphate
D. Nitric acid
Answer» A. Copper sulphate
Explanation: Copper sulfate is a chemical compound which is produced commercially by reacting various copper (II) compounds with sulfuric acid. This compound is used in a wide range of industries, from pyrotechnics to viticulture. It is also known as bluestone or blue vitriol. It is also used in agriculture as a treatment for crops and water systems, as it is a fungicide, herbicide, and pesticide. This compound is c,ommonly sprayed on grapes in the form of a water solution to reduce the risk of fungal infestations.
439.

Which of the following blood cells is compulsory for blood coagulation?

A. Platelets
B. Red Blood Corpuscles
C. White Blood Corpuscles
D. Lymphocites
Answer» A. Platelets
Explanation: Coagulation is the process by which blood forms clots. It is an important part of homeostasis, the cessation of blood loss from a damaged vessel, wherein a damaged blood vessel wall is covered by a platelet and fibrin- containing clot to stop bleeding and begin repair of the damaged vessel. Platelets immediately form a plug at the site of injury, this is called primary homeostasis.
440.

Which was the first antibiotic -

A. Terramycin
B. Neomycin
C. Penicilin
D. Streptomycin
Answer» C. Penicilin
Explanation: Penicillin is a group of antibiotics derived from Penicillium fungi. They include penicillin G, procaine penicillin, benzathine penicillin, and penicillin V. Penicillin antibiotics are historically significant because they are the first drugs that were effective against many previously serious diseases, such assyphilis, and infections caused by staphylococci and streptococci. Penicillins are still widely used today, though many types of bacteria are now resistant.
441.

Human kidney disorder is caused by the pollution of –

A. Cadmium
B. Iron
C. Cobalt
D. Carbon
Answer» A. Cadmium
Explanation: Cadmium (Cd), a by-product of zinc production, is one of the most toxic elements to which man can be exposed at work or in the environment. Once absorbed, Cd is efficiently retained in the human body, in which it accumulates throughout life. Cd is primarily toxic to the kidney, especially to the proximal tubular cells, the main site of accumulation. Cadmium accwnulates in the kidneys and may sometimes cause kidney failure when it is in excess.
442.

Dehydration in human body is caused due to the deficiency of –

A. Vitamin
B. Salt
C. Hormone
D. Water
Answer» D. Water
Explanation: dehydration is the condition where there is acute shortage of water in our body. This occurs when the amount of water leaving our body is greater than the amount consumed.
443.

Which is the organ that excretes water, fat and various catabolic wastes :

A. Kidney
B. Skin
C. Spleen
D. Salivary glands
Answer» A. Kidney
Explanation: The kidneys are organs that serve several essential regulatory roles in most animals, including vertebrates and some invertebrates. They are essential in the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid-base balance, and regulation of blood pressure (via maintaining salt and water balance).
444.

Blood Circulation was discovered by –

A. Mary Anderson
B. Virginia Apgar
C. William Harvey
D. Robert Feulgen
Answer» C. William Harvey
Explanation: William Harveywas the first known physician to describe completely and in detail the systemic circulation and properties of blood being pumped to the brain and body by the heart.
445.

Heart is devoid of -

A. cardiac muscle
B. involuntary muscle
C. voluntary muscle
D. smooth muscle
Answer» B. involuntary muscle
Explanation: Cardiac muscle is also an involuntary muscle, found only in the heart.
446.

From which part of the Omit is clove, the commonly used spice, obtained -

A. Fruit
B. Flower bud
C. Stern
D. Root
Answer» B. Flower bud
Explanation: Cloves are the aromatic dried flower buds of a tree in the family Myrtaceae, Syzygium aromaticum. The clove tree is an evergreen that grows to a height ranging from 8- 12 m, having large leaves and sanguine flowers in numerous groups of terminal clusters. The flower buds are at first of a pale color and gradually become green, after which they develop into a bright red, when they are ready for collecting. Cloves are harvested when 1.5-2 cm long, and consist of a long calyx, terminating in four spreading sepals, and four unopened petals which form a small ball in the centre.
447.

Chewing gum is made from -

A. Resin
B. Tannin
C. Latex
D. Gum
Answer» C. Latex
Explanation: Chewing gum is a type of gum made of chicle, a natural latex product, or synthetic rubber known as polyisobutylene. Most chewing gums are considered polymers. Sugar-free gum sweetened with xylitol has been shown to reduce cavities and plaque. The sweetener sorbitol has the same benefit, but is only about one-third as effective as xylitol. Xylitol is specific in its inhibition of Streptococcus mutans, bacteria that are significant contributors to tooth decay.
448.

Rickets is the deficiency disease of Vitamin D, in which the affected part is the -

A. skin
B. hair
C. bone
D. blood
Answer» C. bone
Explanation: Rickets is a softening of bones in children due to deficiency or impaired metabolism of vitamin D, phosphorus or calcium, potentially leading to fractures and deformity. Rickets is among the most frequent childhood diseases in many developing countries. The predominant cause is a vitamin D deficiency, but lack of adequate calcium in the diet may also lead to rickets (cases of severe diarrhea and vomiting may be the cause of the deficiency).
449.

Darvvin finches' refers to a group of -

A. Fishes
B. Lizards
C. Birds
D. Amphibians
Answer» C. Birds
Explanation: Darwin's finches (also known as the Galapagos finches) are a group of about 15 species of passerine birds. They often are classified as the subfamily Geospizinae or tribe Geospizini. It is still not clear which bird familythey belong to, but they are not related to the true finches. They were first collected by Charles Darwin on the Galapagos Islands during the second voyage of the Beagle. All are found only on the Galapagos Islands, except the Cocos Island Finch from Cocos Island.
450.

Which phenomenon do bats or dolphins use to find prey, predators or obstacles?

A. Refraction of sound
B. Formation of beats
C. Scattering of sound
D. Echo location
Answer» D. Echo location
Explanation: Echolocation, also called biosonar, is the biological sonar used by several kinds of animals. Echolocating animals emit calls out to the environment and listen to the echoes of those calls that return from various objects near them. They use these echoes to locate and identify the objects. Echolocating animals include some mammals and a few birds; most notably microchiropteran bats and odontocetes (toothed whales and dolphins), but also in simpler form in other groups such as shrews, one genus of megachiropteran bats (Rousettus) and two cave dwelling bird groups, the so-called cave swiftlets in the genus Aerodramus (formerly Collocalia) and the unrelated Of bird Steatornis caripensis.
451.

Columba livia is the scientific name of -

A. Pigeon
B. Snake
C. Rabbit
D. Shark
Answer» A. Pigeon
Explanation: The Rock Dove (Columba livia) or Rock Pigeon, is a member of the bird family Columbidae (doves and pigeons). In common usage, this bird is often simply referred to as the "pigeon". The species includes the domestic pigeon (including the fancy pigeon), and escaped domestic pigeons have given rise to feral populations around the world. The Rock Dove was first described by Gmelin in 1789. Thegenus name Columba is the Latinized form of the Ancient Greek (kolumbos), "a diver".
452.

Bones are pneumatic in -

A. Fishes
B. Amphibians
C. Reptiles
D. Birds
Answer» D. Birds
Explanation: Pneumatic boneis is hollow bone filled with air, connected to the respiratory system. Many of a bird's bones are pneumatic, with struts across their hollow interiors to provide a combination of light weight and strength as an adaptation to flying. For flight to occur in Ayes, four physical forces (thrust and drag, lift and weight) must work together. In order for birds to balance these forces, certain physical characteristics are required. Flying birds have evolved reduced weight through several characteristics.
453.

The pigment involved in photosynthetic activity is -

A. anthocyanin
B. fucxanthin
C. carotenoid
D. chlorophyll
Answer» D. chlorophyll
Explanation: Chlorophyll is an extremely important bio-molecule, critical in photosynthesis, which allows plants to absorb energy from light. Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion. However, it is a poor absorber of green and near-green portions of the spectrum, hence the green color of chlorophyll-containing tissues.
454.

Free-living nitrogen fixing micro- organisms are -

A. Rhizobia
B. Soil fungi
C. Vesicular arbuscular mycorrhiza
D. Blue green algae
Answer» A. Rhizobia
Explanation: Rhizobia are soil bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes. Rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods.
455.

Vegetable oils are converted into solid fat (ghee) by -

A. Hydrolysis
B. Addition of agar
C. Oxidation using air and a catalyst
D. Hydrogenation
Answer» D. Hydrogenation
Explanation: Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. The largest scale application of hydrogenation is for the processing of vegetable oils (fats to give margarine and related spreads and shortenings). Typical vegetable oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds).
456.

A drug which helps in controlling fever is

A. Ibuprofen
B. Penicillin
C. Paracetamol
D. Corticosteroid
Answer» C. Paracetamol
Explanation: Paracetamol is a widely used over-the-counter analgesic (pain reliever) and antipyretic (fever reducer). The World Health Organization (WHO) recommends that paracetamol only be used to treat fever in children if their temperature is greater than 38.5°C.
457.

An insect - catching plant is :

A. Australian Acacia
B. Smilax
C. Nepenthes
D. Nerium
Answer» C. Nepenthes
Explanation: Nepenthes mirabilis or the Common Swamp Pitcher-Plant, is a tropical carnivorous plant species of the pitfall trap variety. It has by far the widest distribution of any Nepenthes species and is known from the following countries and regions. A great number of in faunal organisms have been found in the pitchers of this species. These include the sarcophagid fly Sarcophaga papuensis and the mite Nepenthacarus warreni.
458.

The method not used as a Biological control is :

A. Use of predators of a pest.
B. Pheromone traps
C. Use of pesticides
D. Use of neem extracts
Answer» C. Use of pesticides
Explanation: Pesticides are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest. Pesticides are a special kind of products for crop protection. Crop protection products in general protect plants from damaging influences such as weeds, diseases or insects. A pesticide is generally a chemical or biological agent (such as a virus, bacterium, antimicrobial or disinfectant) that through its effect deters, incapacitates, kills or otherwise discourages pests.
459.

'Cod' is a variety of -

A. Goat
B. Fish
C. Crop
D. oral
Answer» B. Fish
Explanation: Cod is the common name for the genus Gadus of demersal fishes, belonging to the family Gadidae. Cod is also used as part of the commons name for a number of other fishes, and there are species suggested to belong to genus Gadus that are not called cod (the Alaska pollock). Cod is popular as a food with a mild flavour and a dense, flaky white flesh and omega-3 fatty acids (EPA and DHA). Young Atlantic cod or haddock prepared in strips for cooking is called scrod. In the United Kingdom, Atlantic cod is one of the most common ingredients in fish and chips, along with haddock and plaice.
460.

Dried flower buds are used as a spice in -

A. Cardamom
B. Cinnamon
C. Cloves.
D. Saffron
Answer» C. Cloves.
Explanation: Cloves are the dried flower buds of an evergreen tree native to eastern Indonesia. Cloves are a versatile spice that can be used in drinks and in both sweet and savoury dishes.
461.

The brain of human adult weighs about -

A. 1200 - 1300 gm
B. 1600 - 2000 gm
C. 500 - 800 gm
D. 104 - 200 gm
Answer» A. 1200 - 1300 gm
Explanation: The adult human brain weighs on average about 3 lbs. (1.5 kg) with a volume of around 1130 cubic centimetres (cm3) in women and 1260 cm3 in men, although there is substantial individual. variation. Men with the same body height and body surface area as women have on average 100g heavier brains, although these differences do not correlate in any simple way with IQ or other measures of cognitive performance. The human brain has the same general structure as the brains of other mammals, but is larger than any other in relation to body size.
462.

Total number of bones in man is -

A. 206
B. 266
C. 300
D. 306
Answer» A. 206
Explanation: A typical adult human skeleton consists of 206 bones. The 206 bones of the skeleton provide a framework and points of attachment for many of the soft tissues of the body. The number of bones changrs with age as multiple ossify nuclei joined by synchondroses fuse into fewer mature bones.
463.

Which of the following pairs is incorrectly matched?

A. Vitamin C- Scurvy
B. Vitamin K - Haomorrhage
C. Vitamin A Night Blindness
D. Vitamin E - Rickets
Answer» D. Vitamin E - Rickets
Explanation: The deficiency of Vitamin D leads to rickets, a childhood bone disorder where bones soften and become prone to fractures and deformity.
464.

‘Bos Taurus’ is a scientific name of –

A. Buffalo
B. Horse
C. Cow
D. Cat
Answer» C. Cow
Explanation: Cattle—colloquially cows—are the most common type of large domesticated ungulates. They are a prominent modern member of the subfamily Bovinae, are the most widespread species of the genus Bos, and are most commonly classified collectively as Bostaurus.
465.

The carbon dioxide content in the air that we exhale is about -

A. 4%
B. 8%
C. 12%
D. 16%
Answer» A. 4%
Explanation: Carbon dioxide exists in Earth's atmosphere in this state, as a trace gas at a concentration of 0.039 per cent by volume. The air we breathe in contains about 0.04% carbon dioxide. The air we breathe out contains about 4% carbon dioxide. In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.
466.

Maximum harm to a tree is caused by

A. Loss of half of its leaves
B. loss of all leaves
C. loss of half of its branches
D. loss of its bark
Answer» B. loss of all leaves
Explanation: Maximum harm to a tree is caused by loss of leaves. This means that the tree will loose its ability to perform photosynthesis or food manufacture. Leaves are a plant's main photosynthetic organs. Leaf structure is closely associated with its photosynthetic function. Leaves must permit carbon dioxide access to the photosynthetic cells but impede water from diffusing out. The oxygen that is a waste productof photosynthesis must be allowed to escape from the leaf
467.

Which one of the following is not a plant product?

A. Caffeine
B. Pipeline
C. Nicotine
D. Saccharin
Answer» D. Saccharin
Explanation: Saccharin is an artificial sweetener. The basic substance, benzoic sulfilimine, has effectively no food energy and is much sweeter than sucrose, but has a bitter or metallic aftertaste, especially at high concentrations. It is used to sweeten products such as drinks, candies, cookies, medicines, and toothpaste. Saccharin derives its name from the word saccharine, meaning of, relating to, or resembling that of sugar.
468.

Which one of the following is not a true snake?

A. Glass snake
B. Sea snake
C. Tree snake
D. Blind snake
Answer» A. Glass snake
Explanation: The glass lizards or 'glass snakes, genus Ophisaurus, are a group of reptiles that resemble snakes, but are actually lizards. Although most species have no legs, their head shape and the fact that they have movable eyelids and external ear openings identify them as lizards. A few species have very small stublike legs near the rear vent. These are vestigial organs meaning they have evolved and they are no longer in use. These animals are also known as Glass Snakes or Jointed Snakes.
469.

Tamiflu is frontline drug against -

A. bird flu
B. cancer
C. AIDS
D. polio
Answer» A. bird flu
Explanation: Oseltamivir marketed under the trade name Tami flu, is an antiviral drug, which may slow the spread of influenza (flu) virus between cells in the body by stopping the virus from chemically cutting ties with its host cell. The drug is taken orally in capsules or as a suspension. It has been used to treat and prevent influenza A virus and influenza B virus infection in over 50 million people since 1999.
470.

Insects responsible for transmitting diseases are called -

A. Vector
B. Transmitter
C. Drones
D. Conductor
Answer» A. Vector
Explanation: A vector-borne disease is one in which the pathogenic microorganism is transmitted from an infected individual to another individual by an arthropod or other agent, sometimes with other animals serving as intermediary hosts. The transmission depends upon the attributes and requirements of at least three different living organisms: the pathologic agent, either a virus, protozoa, bacteria, or helminth (worm); the vector, which are commonly arthropods such as ticks or mosquitoes; and the human host.
471.

Clove, the commonly used spice,is obtained from the -

A. root
B. stem
C. flower bud
D. fruit
Answer» C. flower bud
Explanation: Cloves are the aromatic dried flower buds of a tree in the family Myrtaceae, Syzygum aromaticum. Cloves are native to the Maluku islands in Indonesia and used as a spice in cuisines all over the world. The English name derives from Latin clavus 'nail' (also the origin of French clou and Spanish clavo, 'nail') as thebuds vaguely resemble small irregular nails in shape.
472.

Milk is not considered a balanced diet now-a-days because of the absence of :

A. Magnesium and Vitamin D
B. Iron and Vitamin C
C. Calcium and Vitamin C
D. Iron and Vitamin A
Answer» B. Iron and Vitamin C
Explanation: A balanced diet means getting the right types and amounts of foods and drinks to supply nutrition and energy for maintaining body cells, tissues, and organs, and for supporting normal growth and development. Milk is not considered a balanced diet as it lacks iron and some vitamins like Vitamin C. Calcium, phosphate, magnesium, sodium, potassium, citrate, and chlorine are all included as minerals and they typically occur at concentration of 5-40 mM.
473.

Which vitamin helps in blood- coagulation?

A. Vitamin-A
B. Vitamin-c
C. Vitamin-K
D. Vitamin-E
Answer» C. Vitamin-K
Explanation: Vitamin K is a group of structurally similar, fat-soluble vitamins that are needed for the post translational modification of certain proteins required for blood coagulation and in metabolic pathways in bone and other tissue. They are 2-methyl- 1,4-naphthoquihone (3-)derivatives.
474.

A substance that stimulates the production of antibodies when introduced into a living organism is known as—

A. carcinogen
B. androgen
C. antigen
D. oestrogen
Answer» C. antigen
Explanation: Antigens are the substance that when introduced into the body stimulates the production of an antibody. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs. Antigens can also react with formed antibodies. Antigen-antibody reactions serve as host defenses against microorganisms and other foreign bodies, or are used in laboratory tests for detecting the presence of either antigen or antibody. The antigen city of a protein is determined by its sequence of amino acids as well as by its conformation.
475.

Night blindness results from the deficiency of —

A. Glucose
B. Vitamin-E
C. Vitamin-B
D. Vitamin-A
Answer» D. Vitamin-A
Explanation: Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver and dairy products. Nyetalopia also called "Night Blindness" is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases.
476.

How many feet has a crab got?

A. 12
B. 10
C. 8
D. 6
Answer» C. 8
Explanation: Crabs are crustaceans with eight walking legs and two legs that are sometimes used for walking but usually used for eating. These are its pincers and they are called chela. The front two legs are called chelipeds.
477.

Typhoid fever is caused by –

A. virus
B. bacteria
C. fungus
D. allergy
Answer» B. bacteria
Explanation: Typhoid fever, also known as typhoid, is a common worldwide bacterial disease, transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella typhi, serotype Typhi.
478.

Which of the following blood group is a universal reciptient?

A. A
B. B
C. AB
D. 0
Answer» C. AB
Explanation: Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (-with AB being preferable), but cannot donate blood to either A or B group. They are known as universal recipients.
479.

Which of the following is the largest living bird?

A. Peacock
B. Ostrich
C. Dodo
D. Turkey
Answer» B. Ostrich
Explanation: The ostrich is the largest and heaviest bird that is alive today. Although it cannot fly, the ostrich is also the fastest-running bird today; it can run up to about 43 mph (70 kph). It can outrun most predators, but can also kick to protect itself; another strategy against threats is to crouch close to the ground to camouflage itself. The ostrich can grow up to 9 feet (2.7 m) tall and weighs up to 345 pounds (156 kg) . The ostrich also has the biggesteyeballs of any bird alive today; each eyeball is 2 inches (5 cm) across.
480.

In which of the following generally hormone is not found?

A. Rat
B. Monkey
C. Bacteria
D. Cat
Answer» D. Cat
Explanation: Neutering involves removing the source of the hormones that control reproduction and that determine the typical physical and behavioral characteristics that distinguish males and females. In dogs and cats, this is usually done by surgically removing the testicles in males (castration) and the ovaries in females (spaying). The primary purpose of neutering is to prevent reproduction.
481.

Which organ of Human body is affected by Alzheimer disease?

A. Brain
B. Bone Marrow
C. Lung
D. Intestine
Answer» A. Brain
Explanation: Alzheimer’s disease affects the brain. The disease causes degeneration of brain tissues and nerve cells.
482.

Instrument for measuring light intensity is called -

A. Lucimeter
B. Cryometer
C. Cyanometer
D. Barometer
Answer» A. Lucimeter
Explanation: lucimeter (plural lucimeters) An instrument used to measure light intensity.
483.

In a human body, the longest bone is in the -

A. vertebral column
B. thigh
C. rib cage
D. arm
Answer» B. thigh
Explanation: The femur (pl. femurs or femora), or thigh bone, is the most proximal (closest to the center of the body) bone of the leg in tetrapod vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs. In vertebrates with four legs such as dogs and horses, the femur is found only in the rear legs. The femur is the largest bone in the human body. The head of the femur articulates with the acetabulum. By most measures the femur is one of the strongest bones in the body.
484.

Hay fever is a sign of -

A. malnutrition
B. allergy
C. oldage
D. over work
Answer» B. allergy
Explanation: Hay fever involves an allergic reaction to pollen. A similar reaction occurs with allergy to mold, animal dander, dust, and other allergens that you breathe in. Allergic rhinitis is a group of symptoms affecting the nose. These symptoms occur when you breathe in something you are allergic to, such as dust, dander, insect venom, or pollen. An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen or dust, the body releases chemicals, including histamine.
485.

Which of the following moves/transports water and mineral from the soil to other parts of the plants?

A. Phloem
B. Xylem
C. Chlorophyll
D. Roots
Answer» B. Xylem
Explanation: Xylem moves water and minerals obtained from the soil. The other, phloem transports products of photosynthesis from the leaves to other parts.
486.

Which is the longest bone in the human body?

A. Fibula
B. Radius
C. Stapes
D. Femur
Answer» D. Femur
Explanation: The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and kneecap forming the knee joint.
487.

Which of the following is NOT one of the important steps in processing tea leaves?

A. Rolling
B. Drying
C. Fermenting
D. Withering
Answer» C. Fermenting
Explanation: Generally, there are four different tea categories that differ in processing methods. By withering, new picked leaves are thinly spread to dry during this process, Heated air is forced over the leaves if the climate is not suitable. The main goal of this process is to reduce the water content. By the end of withering, the leaves should be pliable enough to be rolled.
488.

Dehydration in human body is caused due to the loss of:

A. vitamins
B. salts
C. hormones
D. water
Answer» D. water
Explanation: Dehydration is the condition where there is acute shortage of water in ourbody. This occurs when the amount of water leaving our body is greater than the amount consumed. There are three types of dehydration: hypotonic or hyponatremic (primarily a loss of electrolytes, sodium in particular).
489.

The average heart beat rate per minute in a normal person is -

A. 82
B. 92
C. 72
D. 98
Answer» C. 72
Explanation: The average heart rate for adult humans is about 70 to 75 beats per minute in a normal relaxed mode. While we tend to think of the "normal" heart beat rate as being "72 beats per minute", in actuality the heart beat rate is not and should not be constant. In fact, the contemporary understanding is that the degree to which the heart beat varies is a key indicator of health and well being. Conversely, the degree to which it does not vary is a key indicator of health risk. The "72 beats per minute" that we are familiar with is the normal average heart beat rate.
490.

HYV refers to -

A. Hybrid yielding variety
B. Human yellow virus
C. High yielding variety
D. Human yellow vaccine
Answer» C. High yielding variety
Explanation: High Yielding Variety (HYV) seeds played vital role in the progress of agriculture. They are considered as 'miracle seeds'. HYV seeds give better quality yielding. The maturity time of crop is less. Multiple crops can be grown easily. Seeds are mostly flood and drought resistant. Problems of pests and diseases are less. HYV seeds yield more under irrigated conditions. However, the crop demands controlled irrigation. This crop should be irrigated at right time as per the schedule and in right quantity. Most of the HYV seeds are dwarf varieties. They need higher doses of fertilizer.
491.

Among the defects of eye, the shortsightedness is called -

A. coma
B. hypermetropia
C. myopia
D. astigmatism
Answer» C. myopia
Explanation: Myopia, commonly known as being nearsighted and shortsighted. It is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it. This causes the image that one sees when looking at a distant object to be out of focus but in focus when looking at a close object. Eye care professionals most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses. It may also be corrected by refractive surgery, though there are cases of associated side effects.
492.

A man with colour blindness will see red as -

A. Yellow
B. Blue
C. Green
D. Violet
Answer» C. Green
Explanation: Colour-blindness is the inability to distinguish the differences between certain colours. This condition results from an absence of colour-sensitive pigment in the cone cells of the retina, the nerve layer at the back of the eye. A person with colour-blindness has trouble seeing red, green, blue, or mixtures of these colors. The most common type is red-green colour-blindness, where red and green are seen as the same color.
493.

EEG is used to detect the functioning of

A. Heart
B. Lung
C. Kidney
D. Brain
Answer» A. Heart
Explanation: The electrocardiogram (ECG or EKG) is a diagnostic tool that measures andrecords the electrical activity of the heart in exquisite detail. The heart is a two stage electrical pump and the heart's electrical activity can be measured by electrodes placed on the skin. The electrocardiogram can measure the rate and rhythm of the heartbeat, as well as provide indirect evidence of blood flow to the heart muscle.
494.

The metal, which is a constituent of vitamin B12 is -

A. Iron
B. Magnesium
C. Zinc
D. Cobalt
Answer» D. Cobalt
Explanation: Vitamin B12 is a "generic descriptor for compounds exhibiting the biologic activity of cyanocobalarnin: the antianemia factor of liver extract that contains cobalt, a cyano group, and coffin in a cobamide structure. Vitamin B12 is vital for the formation of red blood cells, as well as for the proper functioning and health of nerve tissue. If left untreated, vitamin B12 deficiency, also known as B12 deficiency, can lead to anemia, as well as nerve and brain damage, which may eventually become irreversible.
495.

Which of the following has no skeleton at all?

A. Starfish
B. Sponge
C. Jelly fish
D. Silver fish
Answer» D. Silver fish
Explanation: Silverfish are always wingless and are silvery to brown in color because their bodies are covered with fine scales. They are generally soft bodied.
496.

Fluid part of blood devoid of corpuscles is called -

A. Tissue fluid
B. Plasma
C. Serum
D. Lymph
Answer» C. Serum
Explanation: In blood, the serum is the component that is neither a blood cell (serum does not contain white or red blood cells) nor a clotting factor; it is the blood plasma with the fibrinogens removed. Serum includes all proteins not used in blood clotting (coagulation) and all the electrolytes, antibodies, antigens, hormones, and any exogenous substances (e.g., drugs and microorganisms). Serum is an essential factor for the self-renewal of embryonic stem cells in combination with the cytokine leukemia inhibitory factor.
497.

Heart murmur indicates a -

A. defective valve
B. poor oxygenation
C. dislocation of the heart
D. improper development of muscles
Answer» A. defective valve
Explanation: Murmurs are pathologic heart sounds that are produced as a result of turbulent blood flow that is sufficient to produce audible noise. A functional murmur or "physiologic murmur" is a heart murmur that is primarily due to physiologic conditions outside the heart, as opposed to structural defects in the heart itself. Murmurs may also be the result of various problems, such as narrowing or leaking of valves, or the presence of abnormal passages through which blood flows in or near the heart. Such murmurs are known as pathologic murmurs.
498.

Which of these components of the blood is responsible for clotting -

A. R.B.C.
B. Lymphocytes
C. Monocytes
D. Platelets
Answer» D. Platelets
Explanation: Coagulation is the process by which blood forms clots. It is an important part of hemostasis, the cessation of blood loss from a damaged vessel, wherein a damaged bloodvessel wall is covered by a platelet and fibrin- containing clot to stop bleeding and begin repair of the damaged vessel. Disorders of coagulation can lead to an increased risk of bleeding (hemorrhage) or obstructive clotting (thrombosis). Coagulation begins almost instantly after an injury to the blood vessel has damaged the endothelium lining the vessel.
499.

A person will have brown eyes, blue eyes or black eyes depending on the particular pigment present in the :

A. Pupil
B. Cornea
C. Iris
D. Choroid
Answer» C. Iris
Explanation: Eye color is a polygenic phenotypic character determined by 2 distinct factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on the back of the iris), the melanin content within the iris stroma (located at the front of the iris), and the cellular density of the stroma.
500.

Which of the following crops are used for producing Bio fuels?

A. Sugarcane
B. Corn
C. Jatropha
D. All options are correct
Answer» D. All options are correct
Explanation: A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter.
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