Multiple choice questions XXXXI — task. Science CBSE, Class 9.

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1. Materials of biological origin which are commonly used to maintain and improve soil fertility are

Green manures
Biofertilizers
Bionsecticides
Green manures and Bionsecticides

2. Find out the organochlories among the following:

DDT, BHC, dieldrin, endosulphan
Phrethrin, triazines, simazine
Carbofuran, propoxur, aldicarb
Malathion, fentirothion, parathion

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