Which one of the following is not practiced in the organic farming?

The correct answer is Option (2) → Indiscriminate use of chemical pesticides

Option (1) Dependence on natural predation — Practised in organic farming. In biological control, predators and parasites of the pests keep them in check, in place of chemicals.

Option (2) Indiscriminate use of chemical pesticides — Not practised in organic farming. This is the way of conventional farming. Chemicals kill useful and harmful organisms alike and pollute the soil, ground water and crops. The organic farmer avoids them.

Option (3) Keeping pests at manageable levels — Practised in organic farming. The organic farmer does not try to wipe the pests out. Without them, the useful predatory and parasitic insects that feed on them could not survive.

Option (4) Developing appropriate biocontrol methods — Practised in organic farming. Biocontrol uses living organisms against pests and diseases, such as ladybirds against aphids, Bacillus thuringiensis against caterpillars and Trichoderma against plant pathogens.

NCERT Extract:
Microbes as Biocontrol Agents – …
Microbes as Biofertilisers – “… Microbes can be used to decrease the use of chemical fertilisers and pesticides.”