Question

3. The nitrogen deficiency of soil can be made up by using the principle of
(a) crop rotation
(b) transplantation (c) multiple cropping
4. DDT, BHC and Malathion belong to a class of compounds called
(a) insecticides
(b) fungicides
(c) weedicides
u-bees large scale is called
(d) rodenticides​

Answer 1

Answer:

(B) is the answer of this

Explanation:

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