Q58 of 163 Page 242

The harmful chemical which is accumulating in human beings through food chain is:

DDT (dichlorodiphenyltrichloroethane) is an insecticide that is used to kill insects. Plants absorb it through soil and pass it up in the food chain. Because of biological magnification, it gets accumulated in human beings and may accumulate in large amount too.

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56

In an ecosystem:

(i) The flow of energy is unidirectional


(ii) The flow of materials is unidirectional


(iii) The flow of materials is cyclic


(iv) The flow of energy is cyclic

 57

The ten per cent law is associated with

 59

O2 is converted into O3 by the action of:

 60

Which of the following cannot be added in a composting pit to prepare compost?