Question

(a) How do organic farmers control pests? Give two examples.

(b) State the difference in their approach from that of conventional pest control methods. [3]

Answer 1

(a) Organic farmers create a system where the insects are not eradicated, but are kept at manageable levels naturally and controlled biologically. [1]

Examples are :

(i) The lady bird are useful to get rid of aphids.

(ii) Dragon flies are used to rid mosquitoes.

(ii) Bacillus thuringiensis (Bt) are used to control butterfly caterpillars , caterpillars and cotton bollworm. [0.5+0.5] (any two can be written)

(b)
$\begin{array}{cc}\text{Conventional Pest Control}& \text{Organic Pest Control}\\ \text{Use of chemical insecticide}& \text{Non chemical based.}\\ \text{and pesticide.}& \\ \text{Harmful to non-target organisms.}& \text{Not harmful to non-target}\\ & \text{organisms.}\\ \text{It leads to environmental}& \text{No adverse impact on}\\ \text{pollution.}& \text{environment.}\end{array}$
[0.5+0.5]
(any two can be written)