Question

why should preventive measures and biological control method be preferred for protecting crop.

Answer 1

Biotic and abiotic factors can cause huge losses of food grains and need proper treatment to control them. So it is better to take preventive measures and avoid loss in crop plant production. ... Hence, preventive measures & biological control methods are preferred for protecting crops.

Answer 2

Preventive measures and biological control methods should be preferred for protection of crops because they are ecological save target specific and harmless to other life forms.