McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 1551. |
Endoscope is an instrument used to detect the ulcers in the stomach has a long narrow tube (with a small glowing bulb at one end) which is inserted in to the stomach through the mouth contains. |
| A. | small current carrying wire |
| B. | a narrow tube containing water |
| C. | optical fibre |
| D. | a narrow tube containing some chemical solution |
| Answer» C. optical fibre | |
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Explanation: An endoscope can consist of a rigid or flexible tube and a light delivery system to illuminate the organ or object under inspection. The light source is normally outside the body and the light is typically directed via an optical fiber system. A lens system transmits the image from the objective lens to the viewer, typically a relay lens system in the case of rigid endoscopes or a bundle of fiber optics in the case of a fiberscope. |
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| 1552. |
Kelp is - |
| A. | Sulphide mineral of iron |
| B. | Partially decomposed vegetalion |
| C. | Sea weed rich in iodine content |
| D. | An aluminium silicate mineral |
| Answer» C. Sea weed rich in iodine content | |
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Explanation: Kelps are large seaweeds (algae) belonging to the brown algae in the order Laminariales. Because of its high concentration of iodine, kelp has been used to treat goiter, an enlargement of the thyroid gland caused by a lack of iodine. |
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| 1553. |
Which of the following plant hormones are incorrectly paired? |
| A. | abscisic acid- transpiration |
| B. | auxins- apical dominance |
| C. | cytoldnins- senescence |
| D. | gibberlins- bud and seed dormancy |
| Answer» D. gibberlins- bud and seed dormancy | |
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Explanation: Abscisic acid is responsible for responsible for dormancy of various types. It maintains dormancy in seeds and buds, stimulates the closing of stomata. Gibberellins are responsible for cell division and growth in cell size. |
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| 1554. |
Which of the following is true with reference to blood platelets? |
| A. | They have prominent nuclei |
| B. | They are involved in phagocytosis |
| C. | They have a pigment called haemoglobin |
| D. | They are also called thrombocytes |
| Answer» D. They are also called thrombocytes | |
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Explanation: Platelets, also called thrombocytes, are a component of blood whose function is to stop bleeding by clumping and clotting blood vessel injuries. Unlike red and white blood cells, platelets are not actually cells but rather small fragments of cells. |
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| 1555. |
The second Green Revolution aims at increasing agricultural output to promote |
| A. | Availability of easy credit to big farmers |
| B. | Co-operative farming |
| C. | Inclusive growth |
| D. | Development of rural sector |
| Answer» C. Inclusive growth | |
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Explanation: In the Indian context, the Second Green Revolution is a change in agricultural production widely thought necessary to feed and sustain the growing population on Earth and promote inclusive growth. As per the Eleventh Plan document, the Second Green Revolution aims to meet the problems of small and marginal farmers for providing income security to a large section of rural households and treating them as partners of development instead of a merebeneficiary of some government schemes or programme. |
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| 1556. |
Food crops comprise. |
| A. | Cotton, Tobacco, Sugarcane |
| B. | Linseed, Castor, Turmeric |
| C. | Foodgrains, Pulses, Edible oilseeds |
| D. | Jute, Cotton, Chilies |
| Answer» C. Foodgrains, Pulses, Edible oilseeds | |
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Explanation: Food crops are any agricultural product that can be eaten. Examples of food crops include food grains (Wheat, Rice, Maize) pulses, soybeans, sunflowers, sorghum, and edible oils (mustard, sunflower, etc). On the contrary, the term non food crop applies to the use of agricultural crops for uses other than human (as food) or animal consumption (as feed). |
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| 1557. |
Point out the incorrect pair - |
| A. | Green Revolution - A ricul-tural Development |
| B. | White Revolution - Dairy Development |
| C. | Blue Revolution - Development of Fisheries |
| D. | Operation Flood - Irrigation Development |
| Answer» D. Operation Flood - Irrigation Development | |
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Explanation: 0 |
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| 1558. |
Transpiration increases in – |
| A. | Hot, thy and windy condition |
| B. | Hot, damp and windy condition |
| C. | Cool, damp and windy condition |
| D. | Cool, dry and still condition |
| Answer» A. Hot, thy and windy condition | |
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Explanation: 0 |
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| 1559. |
Quantity of fresh air required for a man is - |
| A. | 1000 cubic feet of air for every 20 minutes |
| B. | 1000 cubic feet of air for every 20 seconds |
| C. | 1000 cubic feet of air for every 10 minutes |
| D. | 1000 cubic feet of air for every 10 seconds |
| Answer» A. 1000 cubic feet of air for every 20 minutes | |
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Explanation: Breathing sixteen times every minute an average volume of air amounting to 30 cubic inches, we find that the expired air amounts to no less than 17 cubic feet per hour. This contaminated air contains only 16 per cent of oxygen, and 4.5 per cent of carbonic acid gas, and is sufficient to vitiate no less than 3,000 cubic feet of fresh air. Pure fresh air contains from 0.03 to 0.04 per cent of carbonic acid gas, or at the most, . |
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| 1560. |
Dinosaurs were - |
| A. | mammals that became extinct |
| B. | large herbivorous creatures which gave rise to hippopotamus species |
| C. | egg-laying mammals |
| D. | reptiles that became extinct |
| Answer» D. reptiles that became extinct | |
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Explanation: Although the word dinosaur means "terrible lizard," the name is somewhat misleading, as dinosaurs are not lizards. Rather, they represent a separate group of reptiles with a distinct upright posture not found in lizards, and many extinct forms did not exhibit traditional reptilian characteristics. Through the first half of the 20th century, before birds were recognized to be dinosaurs, most of the scientific community believed dinosaurs to be sluggish and cold-blooded. |
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| 1561. |
What is the common in AIDS, mumps and poliomyelitis? |
| A. | Young children get affected most readily |
| B. | No effective vaccine has yet been developed for them |
| C. | These are caused by viruses |
| D. | Their germs can be transmit-ted through blood transfusions |
| Answer» C. These are caused by viruses | |
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Explanation: Human immunodeficiency virus (HIV) is a lentivirus (a member of the retrovirus family) that causes acquired immunodeficiency syndrome (AIDS). Mumps (epidemic parotitis) is a viral disease of the human species, caused by the mumps virus. Poliomyelitis is an acute, viral, infectious disease spread from person top erson, primarily via the fecal-oral route. |
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| 1562. |
A 'breath test' used by traffic police to check drunken driving uses: |
| A. | potassium dichromate-sulphuric acid |
| B. | potassium permanganate-sulphuric acid |
| C. | turmeric on filter paper |
| D. | silica gel coated with silver nitrate |
| Answer» A. potassium dichromate-sulphuric acid | |
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Explanation: The main constituent of alcohol is Ethanol and the concentration of ethanol in a sample can be determined by back titration with acidified potassium dichromate. Reacting the sample with an excess of potassium dichromate, all ethanol is oxidized to acetic acid. One major application for this reaction is in old police breathalyzer tests. When alcohol vapor makes contact with the yellow dichromate-coated crystals, the color changes from yellow to green. |
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| 1563. |
According to Darwin's Theory of Evolution, long necks in giraffes - |
| A. | arose because of constant attempt to reach leaves on tall trees, generation after generation |
| B. | do not give them any special advantage and is just an accident |
| C. | give them advantage in finding food, because of which those with long necks survive |
| D. | is a result of the special weather prevalent in African Savannah |
| Answer» A. arose because of constant attempt to reach leaves on tall trees, generation after generation | |
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Explanation: Darwin was the first to propose that long necks evolved in giraffes because they enabled the animals to eat foliage beyond the reach of shorter browsers. Darwin himself wrote %it seems to me almost certain that an ordinary hoofed quadruped might be converted into a giraffe.' He speculated that four-legged animals with longer and longer necks would be capable of reaching higher leaves and vegetation. |
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| 1564. |
Sugarcane plants are usually propagated by vegetative means because - |
| A. | they do not produce seeds |
| B. | it is possible to maintain genetic quality |
| C. | the incidence of disease may be reduced |
| D. | none |
| Answer» A. they do not produce seeds | |
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Explanation: Vegetative reproduction is a form of asexual reproduction in plants. It is a process by which new individuals arise without production of seeds or spores. The methods of vegetative propagation include cutting, vegetative apomixis, layering, division, budding, grafting and tissue culture. |
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| 1565. |
The term 'GM food' refers to the food - |
| A. | that grows under genetic measures |
| B. | that is genetically modified |
| C. | that grows under geographical modification |
| D. | with greater glucose metabolism |
| Answer» B. that is genetically modified | |
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Explanation: Genetically, modified foods (GM foods) are foods derived from genetically modified organisms (GM0s), such as genetically modified crops or genetically modified fish. GMOs have had specific changes introduced into their DNA by genetic engineering |
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| 1566. |
‘Why excessive heating and repeated use of cooking oil are most undesirable? |
| A. | The oil vapour can cause indoor pollution |
| B. | Carcinogenic substances like benzpyrene are produced |
| C. | Nutrient value of food is lost |
| D. | Loss and wastage of oil |
| Answer» B. Carcinogenic substances like benzpyrene are produced | |
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Explanation: Repeated use of cooking oil at high temperatures will cause the hydraulic fat into free fatty acids are easily oxidized, so that the oil becomes rancid and form trans fatty acids can lead to health problems associated with the metabolism of cholesterol, high blood pressure, and heart. Not only that, the repeated use of used oil will also form acrolein is a compound that causes intense itching in the throat and cause coughing. And that is not less dangerous, this oil is a carcinogen that can cause cancer. Therefore, experts recommend eating foods that contain saturated fat less than 10 percent of the daily intake. |
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| 1567. |
Flat footed camels can walk easily in sandy deserts because - |
| A. | pressure on the sand is decreased by increasing the area of the surface in contact |
| B. | pressure on the sand is increased by increasing the area of the surface in contact |
| C. | pressure on the sand is decreased by decreasing the area of the surface in contact |
| D. | pressure on the sand is increased by decreasing the area of the surface in contact |
| Answer» A. pressure on the sand is decreased by increasing the area of the surface in contact | |
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Explanation: Camels have broad, flat, leathery pads with two toes on each foot. When the camelplaces its foot on the ground the pads spread, preventing the foot from sinking into the sand. When walking, the camel moves both feet on one side of its body, then both feet on the other. This gait suggests the rolling motion of a boat, explaining the camel's 'ship of the desert' nickname. The pad supports the animal on loose sand in much the same way that a snowshoe helps a person walk on snow. |
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| 1568. |
A large number of identical plants can be obtained in a short span of time through - |
| A. | large number of seeds of a single plant |
| B. | stern cuttings |
| C. | tissue culture technique |
| D. | hydroponics method |
| Answer» C. tissue culture technique | |
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Explanation: Plant tissue culture is a collection of techniques used to maintain or grow plant cells, tissues or organs under sterile conditions on a nutrient culture medium of known composition. Plant tissue culture is widely used to produce clones of a plant in a method known as micropropagation. Plant tissue culture relies on the fact that many plant cells have the ability to regenerate a whole plant (totipotency). The culture medium contains a gel (agar) with the proper mixture of nutrients, sugars, vitamins and hormones, which causes the plant part to grow at very rapid rates to produce new plantlets. |
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| 1569. |
Full form of the infectious disease SARS is - |
| A. | Syndrome Associated with Respiratory Symptoms |
| B. | Severe Acute Respiratory Syndrome |
| C. | Severe Asthmatic Respiratory Syndrome |
| D. | Syndrome Alarm on Respiratory System |
| Answer» B. Severe Acute Respiratory Syndrome | |
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Explanation: Severe acute respiratory syndrome (SARS) is a serious form of pneumonia. It is caused by a virus that was first identified in 2003. Infection with the SARS virus causes acute respiratory distress (severe breathing difficulty) and sometimes death. SARS is a dramatic example of how quicklyworld travel can spread a disease. It is also an example of how quickly a connected health system can respond to a new health threat. SARS is caused by a member of the coronavirus family of viruses (the same family that can cause the common cold). |
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| 1570. |
In test-tube babies, the - |
| A. | Ovum is fertilized and developed in test- tubes |
| B. | Ovum is fertilized in the test-tubes and developed in uterus |
| C. | Ovum is fertilized in the uterus and developed in test-tubes |
| D. | Ovum is developed without fertilization in test-tubes |
| Answer» B. Ovum is fertilized in the test-tubes and developed in uterus | |
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Explanation: In vitro fertilization is a process by which an egg is fertilized by sperm outside the body. The process involves monitoring a woman's ovulatory process, removing ovum or ova (egg or eggs) from the woman's ovaries and letting sperm fertilize them in a fluid medium in a laboratory. The fertilized egg (zygote) is then transferred to the patient's uterus with the intention of establishing a successful pregnancy. |
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| 1571. |
Human beings have two ears because two ears help - |
| A. | to judge the direction of sound |
| B. | to hear even a feeble sound |
| C. | to enjoy music better |
| D. | to distinguish between two kinds of sounds arriving at the ears in opposite directions |
| Answer» D. to distinguish between two kinds of sounds arriving at the ears in opposite directions | |
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Explanation: We have two ears basically to widen the scope of hearing so that we can find out where sounds are coming from, and from what distance; i.e., sound localization. The brain utilizes subtle differences in intensity, spectral, and timing cues to allow us to localize sound sources |
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| 1572. |
Cultivable land is defined as |
| A. | land actually under crops |
| B. | cultivable waste land + fallow land |
| C. | old fallow lands 4- current fallow lands |
| D. | total fallow lands + net sown area |
| Answer» D. total fallow lands + net sown area | |
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Explanation: Cultivable land refers to the land capable of being cultivated. It consists of net area sown, total fallow lands, culturable wasteland and land under miscellaneous tree crops. |
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| 1573. |
Which one of the followings is/are correct definition of Habitat? |
| A. | A complex of several types of communities |
| B. | Natural environment of a living organism |
| C. | The place where one would go find the particular living organism. |
| D. | Natural environment of a living organism and the place where one would go find the particular living organism. |
| Answer» D. Natural environment of a living organism and the place where one would go find the particular living organism. | |
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Explanation: Habitat is generally defined as the natural environment of an organism, the place in which it is natural for it to live and grow. It is the natural environment in which an organism lives, or the physical environment that surrounds a species population. It is similar in meaning to biotope an area of uniform environmental conditions associated with a particular community of plants and animals |
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| 1574. |
In bio fortification technique plant breeders use breeding to overcome – |
| A. | Loss due to insect pests |
| B. | Decrease in food production |
| C. | Deficiencies of micronutrients and vitamins |
| D. | Loss due to plant diseases |
| Answer» C. Deficiencies of micronutrients and vitamins | |
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Explanation: Biofortification refers to the breeding of crops to increase their nutritional value. The crops produced through biofortification method are always rich in nutrients like iron, zinc and Vitamin A. |
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| 1575. |
The five key indicators of global climate change of our planet are |
| A. | Antartic Sea ice, Oxygen, Rain-fall, Drought and Sea level |
| B. | Sea-level, Rising temperatures, Rainfall, Nitrogen and Arctic Sea ice |
| C. | Arctic Sea ice, Carbon dioxide, Global Temperature, Sea level and Land ice |
| D. | None of these |
| Answer» C. Arctic Sea ice, Carbon dioxide, Global Temperature, Sea level and Land ice | |
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Explanation: 0 |
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| 1576. |
Green House Effect' means |
| A. | Pollution in houses in tropical region |
| B. | Prevention of ultraviolet radiation by the ozone layer |
| C. | Trapping of solar energy due to atmospheric gases |
| D. | Damage to green painted buildings |
| Answer» C. Trapping of solar energy due to atmospheric gases | |
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Explanation: The greenhouse effect occurs when Earth's atmosphere traps solar radiation because of the presence of certain gases, causing the heating of the earth. These greenhouse gases include water vapor, CO2, methane, nitrous oxide (N2O) and other gases, ac-cording to the Environmental Protection Agency (EPA |
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| 1577. |
The presence of air bubble in blood stream is dangerous to life because- |
| A. | Air combines with blood forming a complex |
| B. | The flow of blood increases manifold |
| C. | The flow of blood is obstructed |
| D. | The pressure of blood increases manifold |
| Answer» C. The flow of blood is obstructed | |
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Explanation: The presence of air bubble in blood, known as air embolism occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can lead to heart attack and death. |
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| 1578. |
In human body, ligaments are made up of |
| A. | white fibres and some yellow elastic fibres |
| B. | white fibres only |
| C. | yellow fibres only |
| D. | yellow fibres and muscle fibres |
| Answer» A. white fibres and some yellow elastic fibres | |
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Explanation: A ligament is composed of dense fibrous bundles of collagenous fibres and spindle-shaped cells known as fibrocytes, with little ground substance. Ligaments may be of two major types: white ligament is rich in coilagenous fibres, which are sturdy and inelastic; and yellow ligament is rich in elastic fibres, which are quite tough even though they allow elastic movement. |
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| 1579. |
People consuming alcohol in heavy quantities generally die of – |
| A. | liver or stomach cancer |
| B. | weakening of heart muscles leading to cardiac arrest |
| C. | blood cancer |
| D. | Cirrhosis |
| Answer» D. Cirrhosis | |
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Explanation: Cirrhosis is a condition in which the liver does not function properly due to long- term damage. This damage is characterized by the replacement of normal liver tissue by scar tissue. |
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| 1580. |
Honey that has high concentration of sugar does not decay because |
| A. | Bacteria cannot survive in an active state as it is totally deprived of oxygen |
| B. | It contains natural antioxidant that prevents bacterial attack |
| C. | Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out |
| D. | None of these |
| Answer» C. Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out | |
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Explanation: The reason why bacteria does not grow in high concentration of sugar is because of sugar's high osmotic and dehydrating effects. Sugar, whether in solid or aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity (aw), a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth. |
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| 1581. |
What is‘Biodiversity? |
| A. | Many types of flora & fauna in one forest |
| B. | Many types of flora and fauna in many forests |
| C. | Many population of one species in one forest |
| D. | All the above are true, |
| Answer» A. Many types of flora & fauna in one forest | |
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Explanation: Biodiversity is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems or on the entire Earth. Biologists most often define biodiversity as the "totality of genes, species, and ecosystems of a region" |
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| 1582. |
In the grass lands, trees do not replace the grasses as a part of an ecological succession because of - |
| A. | Limited sun light and paucity of nutrients |
| B. | None of the options |
| C. | Insect and fungi |
| D. | Water limits and fire |
| Answer» D. Water limits and fire | |
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Explanation: Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and provides the largest biomass. |
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| 1583. |
What does the term Ebola stand for? |
| A. | A viral disease outbreak in West Africa |
| B. | A viral disease outbreak in Bangladesh |
| C. | A city in Syria destroyed by ISIS. |
| D. | None of these |
| Answer» A. A viral disease outbreak in West Africa | |
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Explanation: Ebolais a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths. |
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| 1584. |
Which of the following is true for photoperiodic? |
| A. | It occurs only in plants |
| B. | It is related to flowering in plants |
| C. | It is related to feathers of animals |
| D. | It is the reaction of organisms to the length of day or night |
| Answer» D. It is the reaction of organisms to the length of day or night | |
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Explanation: Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: therelative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle. |
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| 1585. |
X-rays can be used |
| A. | for cutting and welding of metals. |
| B. | to detect heart diseases. |
| C. | to detect defects in precious stones and diamonds. |
| D. | to detect gold under the earth. |
| Answer» C. to detect defects in precious stones and diamonds. | |
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Explanation: X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal inhomogeneities— such as inclusions, lattice defects, etc in gems and stones. |
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| 1586. |
Voralloid root' of Gyms helps in |
| A. | Absorption of water |
| B. | Absorption of water and fixation of Nitrogen |
| C. | Anchorage |
| D. | Transport of food |
| Answer» B. Absorption of water and fixation of Nitrogen | |
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Explanation: Branch roots are of two kinds: long-branching geotropic roots and short- branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates. |
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| 1587. |
The non-living characteristic of viruses is – |
| A. | ability to multiply only inside the host |
| B. | ability to cause diseases in the host |
| C. | ability to undergo mutation |
| D. | ability to be crystallise |
| Answer» D. ability to be crystallise | |
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Explanation: Viruses are known as a connecting link between non-living and living being. |
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| 1588. |
What is silverfish? |
| A. | A silvery freshwater fish |
| B. | Leaf of silver oak |
| C. | A small silvery wingles insect |
| D. | An American fox with a silvery fur |
| Answer» C. A small silvery wingles insect | |
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Explanation: A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fishlike appearance of its movements. |
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| 1589. |
A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is |
| A. | to make it pest resistant |
| B. | to improve its taste and nutritive value |
| C. | to make it drought resistant |
| D. | to make its shelflife longer |
| Answer» A. to make it pest resistant | |
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Explanation: Bt Brinjal is a genetically modified (GM) crop created by inserting Cry lAc gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Hell-coverpa armigera). |
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| 1590. |
The cause of Heart attack is: |
| A. | bacteria |
| B. | virus |
| C. | lack of blood supply to the heart |
| D. | impairment of heart's working due to unknown reason |
| Answer» C. lack of blood supply to the heart | |
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Explanation: Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis). |
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| 1591. |
Tachycardia is a condition characterized by |
| A. | heart-rate decreases from the normal |
| B. | heart- rate increases from the normal |
| C. | heart-beat stops |
| D. | heart fails to pump |
| Answer» B. heart- rate increases from the normal | |
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Explanation: Tachycardia is a heart rate that exceeds the nor-mal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals. |
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| 1592. |
Ecosystem consists of : |
| A. | A biotic community and its non-living elements |
| B. | Population |
| C. | A population and its non-living elements |
| D. | A biotic community |
| Answer» A. A biotic community and its non-living elements | |
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Explanation: An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called abiotic components such as temperature, light, moisture, air currents, etc. |
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| 1593. |
What are Lipids? |
| A. | Lipids are monosaccharide |
| B. | Lipids do not provide energy to cells |
| C. | Fruits are a good source of lipids |
| D. | Cholesterol and trans fatty acids are types of Lipids |
| Answer» D. Cholesterol and trans fatty acids are types of Lipids | |
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Explanation: Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol. |
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| 1594. |
Which of the following is least likely to be an effect of global warming? |
| A. | Increased frequency of hurricanes |
| B. | Loss of fertile delta region as for agriculture |
| C. | Decreased rate of photosynthesis in vegetation |
| D. | Shrinking of the polar ice regions |
| Answer» C. Decreased rate of photosynthesis in vegetation | |
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Explanation: Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis. |
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| 1595. |
Leaves of many grasses are capable of folding and unfolding because |
| A. | their mesophyll is not differentiated into palisade and spongy parenchyma |
| B. | they have stomata on both sides of the leaf |
| C. | they have high levels of silica |
| D. | they have specialised bulliform cells |
| Answer» D. they have specialised bulliform cells | |
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Explanation: Bulliform cells are large, bubble- shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss. |
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| 1596. |
Diamond does not conduct electricity, because - |
| A. | It's structure is very compact |
| B. | It is of crystalline nature |
| C. | There are only carbon atoms present in it |
| D. | No free electrons are present in it |
| Answer» D. No free electrons are present in it | |
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Explanation: Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other car-bon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators. |
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| 1597. |
'Gynecomastia' is - |
| A. | Development of hair on ears in males |
| B. | Increased height in females |
| C. | Development of an extra finger in females |
| D. | Development of breasts in males |
| Answer» D. Development of breasts in males | |
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Explanation: Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia. |
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| 1598. |
Biofortifieation is a - |
| A. | method of breeding crops to increase their nutritional value |
| B. | strategy to combat unwanted nutrients in plants |
| C. | method of developing resis-tance to insect pests |
| D. | method of plant breeding for disease resistance |
| Answer» A. method of breeding crops to increase their nutritional value | |
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Explanation: Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed. |
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| 1599. |
Which of the following statements is true? |
| A. | Animals worry about raising their family |
| B. | Animals make several feeding trips in a day |
| C. | Animals often behave sensibly |
| D. | Animals do not know meaning of brotherhood |
| Answer» B. Animals make several feeding trips in a day | |
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Explanation: Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day. |
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| 1600. |
If a healthy freshwater fish is placed in salt water, what will be the expected consequence? |
| A. | The fish becomes dehydrated and dies |
| B. | The fish becomes bloated and dies |
| C. | The fish suffers from fungal or bacterial disease and dies |
| D. | There is no observable effect on the fish provided there is sufficient food |
| Answer» A. The fish becomes dehydrated and dies | |
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Explanation: When freshwater fish is placed in salt water, the water molecules contained in thefish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die. |
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