The term ‘bio-magnification’ refers to the
Increase in population size
Increase in the concentration of non-degradable pollutants as they pass through the food chains
Blowing up of environmental issues by man
Growth of organisation due to food consumption
Much work on biological control of insects has been done in
In India, the most popular bioinsecticide is the extract from
Which of the following are natural insecticides?
$(a)$ Rotenone $(b)$ Pyrethrum
$(c)$ Nicotine $(d)$ Azadirachtin
$DDT $ and $2, 4-D$ were Introduced
Which of the following is a herbicide