McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 401. |
Animals living in the three trunks are known as - |
| A. | Arboreal |
| B. | Voiant |
| C. | Amphibious |
| D. | Aquaticx |
| Answer» A. Arboreal | |
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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. |
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| 402. |
The discoverer of pencillin was - |
| A. | Lord Lister |
| B. | Alexander Fleming |
| C. | Karl Landsteiner |
| D. | Walter Reed |
| Answer» B. Alexander Fleming | |
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Explanation: 0 |
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| 403. |
Blood groups were discovered by - |
| A. | Altmann |
| B. | Landsteiner |
| C. | Losch |
| D. | Ronald Ross |
| Answer» B. Landsteiner | |
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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. |
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| 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 | |
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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. |
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| 405. |
An example of false fruit is – |
| A. | Apple |
| B. | Guava |
| C. | Mango |
| D. | Tomato |
| Answer» A. Apple | |
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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. |
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| 406. |
The green colour of the leaves is due to the presence of - |
| A. | Proteins |
| B. | Lipids |
| C. | Chlorophyll |
| D. | Carbohydrates |
| Answer» C. Chlorophyll | |
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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. |
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| 407. |
The edible part of an onion is - |
| A. | Modified root |
| B. | Aerial flower |
| C. | Aerial stem |
| D. | Fleshy leaves |
| Answer» D. Fleshy leaves | |
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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. |
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| 408. |
Haemophilia is mostly associated with |
| A. | Labourers |
| B. | Royal families |
| C. | Miners |
| D. | Sportsmen |
| Answer» B. Royal families | |
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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. |
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| 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 | |
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Explanation: The opening and closing of heart valves is known as a heartbeat. The average human heart beats 100,000 times per day. |
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| 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 | |
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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). |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 415. |
The animal which can tolerate more summer heat is - |
| A. | Buffalo |
| B. | Cow |
| C. | Goat |
| D. | Donkey |
| Answer» C. Goat | |
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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. |
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| 416. |
Ringworm is a disease. |
| A. | Bacterial |
| B. | Protozoan |
| C. | Viral |
| D. | Fm gal |
| Answer» D. Fm gal | |
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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. |
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| 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 | |
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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). |
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| 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 | |
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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. |
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| 419. |
Both erythrocytes and leucocytes are formed in the . |
| A. | Bone marrow |
| B. | Thymus |
| C. | Arterial walls |
| D. | Lymph nodes |
| Answer» A. Bone marrow | |
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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. |
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| 420. |
Tetanus is caused by - |
| A. | Clostridium |
| B. | Virus |
| C. | Bacteriophage |
| D. | Salmonella |
| Answer» A. Clostridium | |
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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. |
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| 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 | |
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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. |
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| 422. |
Which of the following is a fish? |
| A. | Silverfish |
| B. | Starfish |
| C. | Dogfish |
| D. | Cuttlefish |
| Answer» C. Dogfish | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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Explanation: Ringworm often spreads by direct skin-to-skin contact with an infected person or animal. |
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| 425. |
In man, the normal number of chromosomes is - |
| A. | 42 |
| B. | 44 |
| C. | 46 |
| D. | 48 |
| Answer» C. 46 | |
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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). |
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| 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 | |
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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. |
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| 427. |
Which are the largest fixator of solar energy - |
| A. | Bacteria |
| B. | Protozoa |
| C. | Fungi |
| D. | Green plants |
| Answer» D. Green plants | |
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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. |
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| 428. |
Study of field crops is called - |
| A. | Pomology |
| B. | Agronomy |
| C. | Olericulture |
| D. | Floriculture |
| Answer» B. Agronomy | |
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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. |
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| 429. |
Locked jaw disorder is the other name of the disease - |
| A. | Tetanus |
| B. | Muscular disorder |
| C. | Typhoid |
| D. | Filariasis |
| Answer» A. Tetanus | |
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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. |
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| 430. |
Excretory products of mammalian embryo are eliminated out by - |
| A. | Placenta |
| B. | Amniotic fluid |
| C. | Allantois |
| D. | Ureter |
| Answer» A. Placenta | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 435. |
ECG is done to diagnose an ailment connected with? |
| A. | Kidney |
| B. | Heart |
| C. | Brain |
| D. | Blood |
| Answer» B. Heart | |
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Explanation: ECG stands for electrocardiogram and it is commonly used to detect abnormal heart rhythms and to investigate the cause of chest pains. |
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| 436. |
Process of digestion is helped by - |
| A. | Enzyme |
| B. | Hormone |
| C. | Mineral |
| D. | Vitamin |
| Answer» A. Enzyme | |
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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. |
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| 437. |
Glaucoma is a disease of the - |
| A. | Skin |
| B. | Lungs |
| C. | Liver |
| D. | Eyes |
| Answer» D. Eyes | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 440. |
Which was the first antibiotic - |
| A. | Terramycin |
| B. | Neomycin |
| C. | Penicilin |
| D. | Streptomycin |
| Answer» C. Penicilin | |
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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. |
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| 441. |
Human kidney disorder is caused by the pollution of – |
| A. | Cadmium |
| B. | Iron |
| C. | Cobalt |
| D. | Carbon |
| Answer» A. Cadmium | |
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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. |
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| 442. |
Dehydration in human body is caused due to the deficiency of – |
| A. | Vitamin |
| B. | Salt |
| C. | Hormone |
| D. | Water |
| Answer» D. Water | |
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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. |
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| 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 | |
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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). |
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| 444. |
Blood Circulation was discovered by – |
| A. | Mary Anderson |
| B. | Virginia Apgar |
| C. | William Harvey |
| D. | Robert Feulgen |
| Answer» C. William Harvey | |
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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. |
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| 445. |
Heart is devoid of - |
| A. | cardiac muscle |
| B. | involuntary muscle |
| C. | voluntary muscle |
| D. | smooth muscle |
| Answer» B. involuntary muscle | |
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Explanation: Cardiac muscle is also an involuntary muscle, found only in the heart. |
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| 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 | |
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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. |
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| 447. |
Chewing gum is made from - |
| A. | Resin |
| B. | Tannin |
| C. | Latex |
| D. | Gum |
| Answer» C. Latex | |
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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. |
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| 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 | |
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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). |
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| 449. |
Darvvin finches' refers to a group of - |
| A. | Fishes |
| B. | Lizards |
| C. | Birds |
| D. | Amphibians |
| Answer» C. Birds | |
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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. |
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| 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 | |
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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. |
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