McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 451. |
Columba livia is the scientific name of - |
| A. | Pigeon |
| B. | Snake |
| C. | Rabbit |
| D. | Shark |
| Answer» A. Pigeon | |
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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". |
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| 452. |
Bones are pneumatic in - |
| A. | Fishes |
| B. | Amphibians |
| C. | Reptiles |
| D. | Birds |
| Answer» D. Birds | |
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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. |
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| 453. |
The pigment involved in photosynthetic activity is - |
| A. | anthocyanin |
| B. | fucxanthin |
| C. | carotenoid |
| D. | chlorophyll |
| Answer» D. chlorophyll | |
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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. |
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| 454. |
Free-living nitrogen fixing micro- organisms are - |
| A. | Rhizobia |
| B. | Soil fungi |
| C. | Vesicular arbuscular mycorrhiza |
| D. | Blue green algae |
| Answer» A. Rhizobia | |
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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. |
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| 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 | |
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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). |
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| 456. |
A drug which helps in controlling fever is |
| A. | Ibuprofen |
| B. | Penicillin |
| C. | Paracetamol |
| D. | Corticosteroid |
| Answer» C. Paracetamol | |
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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. |
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| 457. |
An insect - catching plant is : |
| A. | Australian Acacia |
| B. | Smilax |
| C. | Nepenthes |
| D. | Nerium |
| Answer» C. Nepenthes | |
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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. |
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| 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 | |
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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. |
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| 459. |
'Cod' is a variety of - |
| A. | Goat |
| B. | Fish |
| C. | Crop |
| D. | oral |
| Answer» B. Fish | |
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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. |
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| 460. |
Dried flower buds are used as a spice in - |
| A. | Cardamom |
| B. | Cinnamon |
| C. | Cloves. |
| D. | Saffron |
| Answer» C. Cloves. | |
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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. |
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| 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 | |
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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. |
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| 462. |
Total number of bones in man is - |
| A. | 206 |
| B. | 266 |
| C. | 300 |
| D. | 306 |
| Answer» A. 206 | |
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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. |
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| 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 | |
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Explanation: The deficiency of Vitamin D leads to rickets, a childhood bone disorder where bones soften and become prone to fractures and deformity. |
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| 464. |
‘Bos Taurus’ is a scientific name of – |
| A. | Buffalo |
| B. | Horse |
| C. | Cow |
| D. | Cat |
| Answer» C. Cow | |
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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. |
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| 465. |
The carbon dioxide content in the air that we exhale is about - |
| A. | 4% |
| B. | 8% |
| C. | 12% |
| D. | 16% |
| Answer» A. 4% | |
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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. |
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| 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 | |
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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 |
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| 467. |
Which one of the following is not a plant product? |
| A. | Caffeine |
| B. | Pipeline |
| C. | Nicotine |
| D. | Saccharin |
| Answer» D. Saccharin | |
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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. |
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| 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 | |
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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. |
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| 469. |
Tamiflu is frontline drug against - |
| A. | bird flu |
| B. | cancer |
| C. | AIDS |
| D. | polio |
| Answer» A. bird flu | |
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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. |
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| 470. |
Insects responsible for transmitting diseases are called - |
| A. | Vector |
| B. | Transmitter |
| C. | Drones |
| D. | Conductor |
| Answer» A. Vector | |
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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. |
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| 471. |
Clove, the commonly used spice,is obtained from the - |
| A. | root |
| B. | stem |
| C. | flower bud |
| D. | fruit |
| Answer» C. flower bud | |
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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. |
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| 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 | |
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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. |
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| 473. |
Which vitamin helps in blood- coagulation? |
| A. | Vitamin-A |
| B. | Vitamin-c |
| C. | Vitamin-K |
| D. | Vitamin-E |
| Answer» C. Vitamin-K | |
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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. |
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| 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 | |
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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. |
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| 475. |
Night blindness results from the deficiency of — |
| A. | Glucose |
| B. | Vitamin-E |
| C. | Vitamin-B |
| D. | Vitamin-A |
| Answer» D. Vitamin-A | |
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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. |
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| 476. |
How many feet has a crab got? |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 6 |
| Answer» C. 8 | |
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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. |
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| 477. |
Typhoid fever is caused by – |
| A. | virus |
| B. | bacteria |
| C. | fungus |
| D. | allergy |
| Answer» B. bacteria | |
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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. |
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| 478. |
Which of the following blood group is a universal reciptient? |
| A. | A |
| B. | B |
| C. | AB |
| D. | 0 |
| Answer» C. AB | |
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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. |
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| 479. |
Which of the following is the largest living bird? |
| A. | Peacock |
| B. | Ostrich |
| C. | Dodo |
| D. | Turkey |
| Answer» B. Ostrich | |
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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. |
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| 480. |
In which of the following generally hormone is not found? |
| A. | Rat |
| B. | Monkey |
| C. | Bacteria |
| D. | Cat |
| Answer» D. Cat | |
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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. |
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| 481. |
Which organ of Human body is affected by Alzheimer disease? |
| A. | Brain |
| B. | Bone Marrow |
| C. | Lung |
| D. | Intestine |
| Answer» A. Brain | |
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Explanation: Alzheimer’s disease affects the brain. The disease causes degeneration of brain tissues and nerve cells. |
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| 482. |
Instrument for measuring light intensity is called - |
| A. | Lucimeter |
| B. | Cryometer |
| C. | Cyanometer |
| D. | Barometer |
| Answer» A. Lucimeter | |
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Explanation: lucimeter (plural lucimeters) An instrument used to measure light intensity. |
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| 483. |
In a human body, the longest bone is in the - |
| A. | vertebral column |
| B. | thigh |
| C. | rib cage |
| D. | arm |
| Answer» B. thigh | |
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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. |
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| 484. |
Hay fever is a sign of - |
| A. | malnutrition |
| B. | allergy |
| C. | oldage |
| D. | over work |
| Answer» B. allergy | |
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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. |
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| 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 | |
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Explanation: Xylem moves water and minerals obtained from the soil. The other, phloem transports products of photosynthesis from the leaves to other parts. |
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| 486. |
Which is the longest bone in the human body? |
| A. | Fibula |
| B. | Radius |
| C. | Stapes |
| D. | Femur |
| Answer» D. Femur | |
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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. |
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| 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 | |
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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. |
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| 488. |
Dehydration in human body is caused due to the loss of: |
| A. | vitamins |
| B. | salts |
| C. | hormones |
| D. | water |
| Answer» D. water | |
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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). |
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| 489. |
The average heart beat rate per minute in a normal person is - |
| A. | 82 |
| B. | 92 |
| C. | 72 |
| D. | 98 |
| Answer» C. 72 | |
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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. |
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| 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 | |
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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. |
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| 491. |
Among the defects of eye, the shortsightedness is called - |
| A. | coma |
| B. | hypermetropia |
| C. | myopia |
| D. | astigmatism |
| Answer» C. myopia | |
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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. |
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| 492. |
A man with colour blindness will see red as - |
| A. | Yellow |
| B. | Blue |
| C. | Green |
| D. | Violet |
| Answer» C. Green | |
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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. |
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| 493. |
EEG is used to detect the functioning of |
| A. | Heart |
| B. | Lung |
| C. | Kidney |
| D. | Brain |
| Answer» A. Heart | |
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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. |
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| 494. |
The metal, which is a constituent of vitamin B12 is - |
| A. | Iron |
| B. | Magnesium |
| C. | Zinc |
| D. | Cobalt |
| Answer» D. Cobalt | |
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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. |
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| 495. |
Which of the following has no skeleton at all? |
| A. | Starfish |
| B. | Sponge |
| C. | Jelly fish |
| D. | Silver fish |
| Answer» D. Silver fish | |
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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. |
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| 496. |
Fluid part of blood devoid of corpuscles is called - |
| A. | Tissue fluid |
| B. | Plasma |
| C. | Serum |
| D. | Lymph |
| Answer» C. Serum | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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. |
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| 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 | |
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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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Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.