Answer: C) viruses (HTLV III) Explanation: AIDS: The term means Acquired Immunity Deficiency Synodrome. The virus attacks the T cells of the (white corpuscle type) blood and destroys them.

Answer: D) 120 decibles Explanation: High frequency sound attacks the tympanic memberane and makes it defective. 120 decibles is too high a pitch to be heard and therefore it impairs the hearing ability.

Answer: D) trypanosoma Explanation: Trypanosoma is a protozoan animal. It lives as a parasite in the blood and later invades the cerebrospinal fluid to cause the sleeping sickness. This parasite is transmitted by the Tsetse fly.

Answer: B) aestivation Explanation: Aestivation is summer sleep. Many organisms like the snails do not find it comfortable in summer. They withdraw and lead a life with reduced BMR (basic Metabolic Rate) in a state of  dormancy.

Answer: C) Detritivores Explanation: Deep sea animals cannot produce food as there is no light. They have to depend upon the fall out of organic debirs raining down on them from surface layers. Hence they are detritivores.

Answer: C) Herbert Spencer Explanation: August Weismann cut off the tails of mice for 21 successive generations and still they produced generation after generation of only tailed young ones. So he concluded that acquired characters are not inherited.

Answer: C) Ernst von Haeckel Explanation: The biogenetic law states that ontogeny (study of development) repeats phylogeny (origin from previous group of racial history), The young one of the frog namely the tadpole is like a fish cosidered to be ancestral to frog.

Answer: B) origin of life Explanation: A. J . Oparin was the first to propose the origin of life from inorganic chemical atoms like Oxygen, Hydrogen, Nitrogen and Carbon.