Assertion : The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity.
Reason : Gross primary productivity is the rate of net production of organic meterial (biomass).

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reson are false.

Answer

D

Explanation

Mercury is an important toxic pollutant. It is changed to water solublec dimethyl mecury which undergeos biomegnification ie. Accumlates in the body of organism inhabiting in the water . Eating poised animals causes deformity known as minamata disease whichis characterized by diarrhoea, impairment of variou sense, numbeness of lips, bluriing of vision mental dearrangemt and death .