Starch is an example of-
Answer: A
Starch is a polysaccharide - a polymer of hundreds or thousands of glucose units.
It occurs as amylose, an unbranched chain, and amylopectin, a branched one. It is the storage carbohydrate of plants; glycogen plays the same role in animals.
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Cretinism is due to the disorder of the glands
Answer: C
Cretinism is a disorder of the thyroid.
Deficiency of thyroxine from birth stunts both physical growth and mental development irreversibly. It is caused by iodine deficiency in the mother or by a failure of the child's own gland, and is now screened for in newborns.
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Radish is a
Answer: C
The edible radish is a modified root - a swollen taproot storing food for the plant's second year.
Carrot, beetroot and turnip are the same kind of structure. A bulb is a compressed shoot with fleshy leaves, a corm a swollen stem base, and a tuber a swollen underground stem.
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Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
Answer: B
Robert Brown discovered and named the cell nucleus in 1831, while studying orchids.
He is also remembered for Brownian motion, the random movement of pollen grains in water that he described in 1827. Robert Hooke had named the cell itself in 1665.
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Bacteria divide by
Answer: A
Bacteria divide by binary fission.
The chromosome is replicated, the copies move apart and the cell divides into two identical daughters. Under good conditions a bacterium may divide every twenty minutes, which is why a colony grows so fast.
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In photosynthesis________
Answer: A
In photosynthesis light energy is converted into chemical energy, stored in the bonds of glucose.
\[ \mathrm{6CO_2 + 6H_2O \xrightarrow{light} C_6H_{12}O_6 + 6O_2} \]
It is the entry point for almost all the energy in the living world; respiration then releases it again.
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Photo-oxidation is
Answer: D
All three descriptions apply to photo-oxidation.
It is the light-driven and oxygen-driven breakdown of a substance, and it covers photorespiration, in which Rubisco fixes oxygen instead of carbon dioxide, and photolysis, the light-driven splitting of water.
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Which among the following blood protein regulates the amount of water in plasma ?
Answer: D
Albumin regulates the water content of plasma.
It is the most abundant plasma protein and exerts most of the colloid osmotic pressure that holds water inside the capillaries. When albumin falls - in liver disease or malnutrition - fluid leaks into the tissues and causes oedema.
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Which one of the following vitamins is known as the anti sterile factor ?
Answer: B
Tocopherol - vitamin E - is called the anti-sterility factor.
Its deficiency causes reproductive failure in laboratory animals, which is how it was discovered in 1922. It is also the body's principal fat-soluble antioxidant, protecting membrane lipids from oxidation.
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Oparin is known for his hypothesis on
Answer: B
Oparin is known for his hypothesis on the origin of life.
He proposed in 1924 that organic molecules formed in the early reducing atmosphere and accumulated in the sea as a 'primordial soup' from which the first living systems arose. Haldane reached the same conclusion independently in 1929.
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