(a) Organic farmers prefer biological control of diseases and pests to the use of chemicals for the purpose justify (b) Give example of a bacterium a

A) Bacillus Turingenesis

B) The selection of disease resistant varieties

C) The plants may contain toxic chemicals and unpleasant to taste

Answer is (A) Biomass

(D) The friendly insects will die which give high yield

Answer is (C) Both A & B

(d) both a and c

The ecological principle behind the biological control of pest insects is based on the ability of predator to regulate prey population in that habitat. For example Gambusia sh prey upon the...

(iii) Both assertion and reason are wrong statement.

We can control spreading of diseases by mosquitoes and houseflies by using repellants, throwing garbage in covered bins, avoiding stagnation of water and checking breeding of these insects.