Biology GK Questions Quiz-9

Biology GK Questions Quiz-9

Biology Multiple Choice Questions (MCQs) Quiz for State and UPSC Civil Services Examinations. Objective Questions on Biology for competitive examinations.

    161. Which animal produces the biggest baby ?

    (1) Camel 
    (2) Lion
    (3) Elephant 
    (4) Blue Whale
    Answer:
    161. (4) Births in elephants tend to take place during the rains. Calves are born 85 cm (33 in) tall and weigh around 120 kg (260 lb). The sperm whale produces the largest baby that weighs about 1 ton at birth. The newborn can instinctively swim for the first 10 seconds with help from its mother and swim alone within 30 minutes after birth. When baby blue whales are first born, they weigh over 3,000 kg (3 tones), about the same weight as a fully grown hippopotamus. Once born, a baby blue whale takes two years to reach a weight of 26,000 kg (26 tones). No other living creature grows so quickly.

    162. Heart attack occurs due to :

    (1) Bacterial attack on the heart
    (2) Stopping of heart beat
    (3) Lack of blood supply to the heart itself
    (4) Impairment of heart’s working due to unknown reasons
    Answer:
    162. (3) A heart attack occurs if the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked. If blood flow isn’t restored quickly, the section of heart muscle begins to die. Heart attacks most often occur as a result of coronary heart disease (CHD), also called coronary artery disease. CHD is a condition in which a waxy substance called plaque (plak) builds up inside the coronary arteries. These arteries supply oxygen-rich blood to the heart.

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

    (1) Pupil 
    (2) Cornea
    (3) Iris 
    (4) Choroid
    Answer:
    163. (3) 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. The appearance of blue, green, as well as hazel eyes results from the Rayleigh scattering of light in the stroma, a phenomenon similar to that which accounts for the blueness of the sky. Neither blue nor green pigments are ever present in the human iris or ocular fluid.

    164. Which of the following elements is obtained from the sea algae ?

    (1) Argon 
    (2) Sulphur
    (3) Vanadium 
    (4) Iodine
    Answer:
    164. (4) Fusus vesiculosus is a brown seaweed and is also known as bladderwrack or red algae, according to the National Institutes of Health (NIH). Red marine algae and other seaweeds are common components of Asian diets and are often used in dietary supplements. The high iodine content in red marine algae can lead to hypothyroidism or hyperthyroidism.

    165. Which of the following is not a component of chlorophyll ?

    (1) Hydrogen 
    (2) Magnesium
    (3) Carbon 
    (4) Calcium
    Answer:
    165. (4) Chlorophyll, a photo-receptive pigment, allows plants to absorb sunlight and synthesize it into
    carbohydrates and oxygen. The basic formula for photosynthesis takes 6 molecules of carbon dioxide
    and 6 molecules of water, reacts them in the presence of chlorophyll and sunlight (a catalyst), and converts them into 1 molecule of glucose (C6H12O6) and 6 molecules of oxygen. Chlorophyll is a chlorin pigment, which is structurally similar to and produced through the same metabolic pathway as other porphyrin pigments such as heme. At the center of the chlorin ring is a magnesium ion. The molecular formula of C55H70O6N4 Mg and a structure of (2-formyl)- chlorophyll has been deduced based on NMR, optical and mass spectra.

    166. Which of the following is the largest living bird ?

    (1) Peacock 
    (2) Ostrich
    (3) Dodo 
    (4) Turkey
    Answer:
    166. (2) 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 biggest eyeballs of any bird alive today; each eyeball is 2 inches (5 cm) across. It has a long neck that allows it to see predators from far away.

    167. In which of the following generally hormone is not found ?

    (1) Rat 
    (2) Monkey
    (3) Bacteria 
    (4) Cat
    Answer:
    167. (4) 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.

    168. The causative organism of dengue fever is

    (1) Fungus 
    (2) Bacteria
    (3) Protozoa 
    (4) Virus
    Answer:
    168. (4) Dengue fever also known as breakbone fever, is an infectious tropical disease caused by the dengue virus. Symptoms include fever, headache, muscle and joint pains, and a characteristic skin rash that is similar to measles. In a small proportion of cases the disease develops into the life-threatening dengue hemorrhagic fever, resulting in bleeding, low levels of blood platelets and blood plasma leakage, or into dengue shock syndrome, where dangerously low blood pressure occurs. Dengue is transmitted by several species of mosquito within the genus Aedes, principally A. aegypti.

    169. Which of the following is considered to be the best cholesterol ?

    (1) VLDL 
    (2) LDL
    (3) HDL 
    (4) Triglycerids
    Answer:
    169. (3) High-density lipoprotein (HDL) is one of the five major groups of lipoproteins, which, in order of sizes, largest to smallest, are chylomicrons, VLDL, IDL, LDL, and HDL, which enable lipids like cholesterol and triglycerides to be transported within the waterbased bloodstream. In healthy individuals, about thirty percent of blood cholesterol is carried by HDL. About one-fourth to one-third of blood cholesterol is carried by high-density lipoprotein (HDL). HDL cholesterol is known as “good” cholesterol, because high levels of HDL seem to protect against heart attack. Low levels of HDL (less than 40 mg/dL) also increase the risk of heart disease. Medical experts think that HDL tends to carry cholesterol away from the arteries and back to the liver, where it’s passed from the body. Some experts believe that HDL removes excess cholesterol from arterial plaque, slowing its buildup.

    170. Thalassemia is a hereditary disease. It affects

    (1) Blood 
    (2) Spleen
    (3) Lungs 
    (4) Heart
    Answer:
    170. (1) Thalassemia are forms of inherited autosomal recessive blood disorders that originated in the
    Mediterranean region. In thalassemia, the disease is caused by the weakening and destruction of red blood cells. Whilst possessing the ability to cause significant complications, including anaemia, iron overload, bone deformities and cardiovascular illness, thalassemia may confer a degree of protection against malaria, which is or was prevalent in the regions where the trait is common.

    171. Which of the following represents a foodchain involving a producer, a vegetarian and a non vegetarian ?

    (1) Grass – Insect – Elephant
    (2) Plant – Rabbit – Tiger
    (3) Fish – Insect – Whale
    (4) Tiger – Rabbit – Owl
    Answer:
    171. (2) A food chain is a linear sequence of links in a food web starting from a trophic species that eats no other species in the web and ends at a trophic species that is eaten by no other species in the web. Plant, rabbit and tiger form a food chain where plant represents producer, rabbits represent a vegetarian,
    while tiger represents a non-vegetarian.

    172. Which of the following makes the skin layer impervious to water ?

    (1) Collagen 
    (2) Melanin
    (3) Keratin 
    (4) Chitin
    Answer:
    172. (3) Keratin is a family of fibrous structural proteins. Keratin is the key structural material making up the outer layer of human skin. It is also the key structural component of hair and nails. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and insoluble and form strong unmineralized tissues found in reptiles, birds, amphibians, and mammals. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength.

    173. Two richest known sources of edible protein are

    (1) meat and eggs
    (2) milk and vegetables
    (3) soyabean and groundnut
    (4) some type of algae and other micro-organisms
    Answer:
    173. (3) The richest sources of protein are animal foods such as chicken, meat, fish, cheese and eggs.
    However, plant proteins are believed to be healthier because of their lower fat content. Plant protein is
    found (e.g.) in beans (esp. soy beans), lentils, nuts, quorn and seeds. Fish and seafood are some of the
    richest sources of protein. One-half of a typical fillet of halibut or salmon provides approximately 41g of protein. Soybeans are legumes that provide a valuable protein-rich food option for vegetarians and nonvegetarians alike. One cup of boiled soybeans provides over 28g of protein.

    174. Which of the following weeds has been found useful to check water pollution caused by industrial affluents ?

    (1) Parthenium
    (2) Elephant grass
    (3) Water hyacinth
    (4) Both (1) and (2) above
    Answer:
    174. (3) Around the world, there is an increasing trend in areas of land, surface waters and groundwater affected by contamination from industrial, military and agricultural activities due to either ignorance, lack of vision, or carelessness. In the last three decades a special interest in the world is aroused by the potential of using the biological methods in the waste water treatment. Water hyacinth (Eichhornia crassipes) constitutes an important part of an aquatic ecosystem. Water hyacinth as a very promising plant with tremendous application in wastewater treatment is already proved. Water hyacinth is used to treat waste water from dairies, tanneries, sugar factories, pulp and paper industries, palm oil mills, distilleries, etc.

    175. Which of the following is correlated with blood pressure ?

    (1) Liver 
    (2) Testis
    (3) Pancreas 
    (4) Adrenal
    Answer:
    175. (4) Blood pressure is an important indicator of adrenal health and function. Mild adrenal weakness is usually accompanied by normal to high blood pressure. As Adrenal Fatigue advances, low blood pressure, at rest or related to posture becomes more prevalent.

    176. Which of the following structures present in mammalian skin directly helps in keeping the body warm ?

    (1) Pigmented cells
    (2) Sweat glands
    (3) Lymph vessels
    (4) Blood capillaries
    Answer:
    176. (3) The lymphatic system consists of a network of specialized lymphatic vessels and various tissues and organs throughout the body that contain lymphocytes (White Blood Cells) and other cells that help the body fight infection and disease. The lymphatic vessels are similar to veins but have thinner walls. Some of these vessels are very close to the skin surface and can be found near veins; others are just under the skin and in the deeper fatty tissues near the muscles and can be found near arteries.

    177. Which from the following diseases usually spreads through milk?

    (1) Tuberculosis
    (2) Jaundice
    (3) Diphtheria
    (4) Cholera
    Answer:
    177. (1) There are two forms of tuberculosis that cause significant disease in mammals. Human tuberculosis, a sometimes acute, but much more commonly, a chronic lung infection is caused by the bacterium, Mycobacterium tuberculosis. Bovine tuberculosis is a very similar disease that infects cattle, as well as deer, goats, elk and many other animals. This infection is caused by a related bacterium, Mycobacterium bovis. Human infections with the bovine form of the bacteria are transmitted through milk.

    178. Which are the largest fixator of solar energy ?

    (1) Bacteria 
    (2) Protozoa
    (3) Fungi 
    (4) Green plants
    Answer:
    178. (4) 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. Deserts, tundra, and the deep ocean are the least productive ecosystems, typically having an energy fixation of less than 0.5 × 103 kilocalories per square meter per year (thousands of kcal/m2/yr; it takes one calorie to raise the temperature of one gram of water by 34°F [1°C] under standard conditions, and there are 1,000 calories in a kcal). Grasslands, montane and boreal forests, waters of the continental shelf, and rough agriculture typically have productivities of 0.5-3.0 × 103 kcal/m2/yr. Moist forests, moist prairies, shallow lakes, and typical agricultural systems have productivities of 3-10 × 103 kcal/m2/yr. The most productive ecosystems are fertile estuaries and marshes, coral reefs, terrestrial vegetation on moist alluvial deposits, and intensive agriculture, which can have productivities of 10-25 × 103 kcal/m2/yr.

    179. Correlate the following :

    Source
    (a) Green leafy vegetables
    (b) Raw cabbage
    (c) Brewers yeast
    (d) Wheat-germ oil
    Vitamin
    (1) A 
    (2) B1
    (3) C 
    (4) D
    (5) E
    (a) (b) (c) (d)
    (1) (1) (2) (3) (4)
    (2) (1) (3) (2) (5)
    (3) (2) (3) (4) (5)
    (4) (2) (4) (5) (1)
    Answer:
    179. (2) Vitamin A is found naturally in many foods: liver (beef, pork, chicken, turkey, fish) (6500 ìg 722%), including cod liver oil; dandelion greens (5588 IU 112%); carrot (835 ìg 93%); broccoli leaf (800 ìg 89%); spinach (469 ìg 52%); collard greens (333 ìg 37%), etc. Brewer’s yeast is often taken as a powder, or as tablets or capsules. High-quality brewer’s yeast powder or flakes contain as much as 60 mcg of chromium per tablespoon (15 grams). The B-complex vitamins in brewers yeast include B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B9 (folic acid), and H or B7 (biotin). These vitamins help break down carbohydrates, fats, and proteins, which provide the body with energy. Wheat germ oil is extracted from the germ of the wheat kernel, which makes up only 2.5% by weight of the kernel. Wheat germ oil is very high in vitamin E, and has the highest content of vitamin E of any food that has not undergone prior preparation or vitamin fortification. Raw cabbage is a good source of vitamins, minerals, and fiber that help protect our body. All cabbage types provide vitamin C, folic acid, potassium, manganese, magnesium, riboflavin and thiamin.

    180. Which of the following is a correct description of ‘tissue culture’?

    (1) Conservation of forests and plantation
    (2) Growth and propagation of horticultural crops
    (3) Science of cultivating animal tissue in artificial medium
    (4) Protection of wild animals
    Answer:
    180. (3) Tissue culture is the growth of tissues or cells separate from the organism. This is typically
    facilitated via use of a liquid, semi-solid, or solid growth medium, such as broth or agar. Tissue culture
    commonly refers to the culture of animal cells and tissues, with the more specific term plant tissue
    culture being used for plants. In modern usage, tissue culture generally refers to the growth of cells from a tissue from a multicellular organism in vitro.

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