Question

Answer abv question,...............m

Answer 1

Answer: Preventive measures ensure that the crop plants are protected from the harmful biotic factors (such as diseases, weeds and insects) and abiotic factors (such as drought and salinity). ... Hence, preventive measures & biological control methods are preferred for protecting crops.

Answer 2

Answer:

Preventive measures and biological control methods should be preferred for protecting crops because excessive use of chemicals leads to environmental problems. These chemicals are also poisonous for plants and animals.

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