Which of these diseases is caused by a deficiency of iodine ?
Answer: B
Correct answer: Goitre
Iodine is needed to make thyroxine, and without it the thyroid enlarges in an attempt to compensate, producing a goitre. Rickets follows from lack of vitamin D, scurvy from vitamin C and beri-beri from vitamin B1.
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Which among the following is a Vitamin?
Answer: B
Folic acid is a vitamin - B9.
It is needed to make DNA and to form red blood cells, and its deficiency in early pregnancy causes neural tube defects, which is why supplements are given. Citric and gluconic acids are ordinary organic acids, not vitamins.
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Water pollution of a river is measured by_______
Answer: D
River pollution is measured by the amount of dissolved oxygen.
Organic waste is broken down by bacteria that consume oxygen, so the more polluted the water the less oxygen is left. The related measure, biochemical oxygen demand, is the oxygen the bacteria would use over five days.
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Genes are made of
Answer: D
Genes are made of nucleotides - strung together as DNA.
Each nucleotide is a sugar, a phosphate and one of four bases, and it is the sequence of those bases that carries the information. A gene is a stretch of that sequence coding for one protein or RNA.
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Enzymes are produced by
Answer: B
Digestive enzymes are produced by exocrine glands, which secrete through ducts.
The salivary glands, gastric glands, pancreas and intestinal glands are all exocrine. Endocrine glands secrete hormones directly into the blood and have no ducts.
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What is scientific name of "Cotton" ?
Answer: C
The scientific name of cotton is Gossypium herbaceum.
It is one of four cultivated cotton species. Azadirachta indica is neem, Phaseolus aureus the green gram and Ficus benghalensis the banyan.
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The universal donor belongs to blood group
Answer: D
Group O negative is the universal donor.
Its red cells carry neither the A nor the B antigen, so no recipient's antibodies attack them. Group AB is the universal recipient for the converse reason: its plasma has neither anti-A nor anti-B antibody.
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The mode of nutrition in which particulate food is devoured is
Answer: A
Devouring particulate food is holozoic nutrition.
The food is ingested, digested inside the body, absorbed and the residue egested. It is how nearly all animals feed. Holophytic nutrition is photosynthesis, saprophytic is absorption from dead matter and parasitic from a living host.
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Food wrapped in news paper is likely to get contaminated by
Answer: C
Food wrapped in newspaper can be contaminated with lead.
Printing inks have contained lead-based pigments and driers, which transfer to oily food in contact with the print. Lead accumulates in the body and damages the nervous system, especially in children.
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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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