Which of the following are natural insecticides?

$(a)$ Rotenone $(b)$ Pyrethrum
$(c)$ Nicotine $(d)$ Azadirachtin

Which of the following pesticides does not inhibit cholinesterase

Disadvantages of chemical agents are

$I.$ chemicals are toxic and harmful to human beings and animals

$II.$ chemicals pollute the environment and plants

$III.$ weedicides used to remove weeds also pollute the soil

Choose the correct option

Organophosphate insecticides inhibit

The most common pesticide used in India is