Which of the following are natural insecticides?
$(a)$ Rotenone $(b)$ Pyrethrum
$(c)$ Nicotine $(d)$ Azadirachtin
$(a), (b)\; and\; (c) \;only$
$(a), (c)\; and\; (d) \;only$
$(a) \;and\; (b) \;only$
$(a), (b), (c)\; and\; (d)$
Pyrethrin is a common ingredient of
Pick out the correct statement
Pheromone traps have
Cellulose fibre is obtained from Gossypium
Father of green revolution in India is