Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

3. Self perpetuating

Explanation:

The biological method is the technique in which there is the use of living microorganisms or their product for the control of pests. 

This method uses the microbes which act as predators or enemies of the target pest species. 

The biological control method is often relatively inexpensive because the method uses microorganisms that can be easily cultured. 

They do not contribute the pollution. 

If biocontrol agents are introduced in any area, they can survive for multiple years and are capable of continuing or renewing themselves indefinitely i.e. become self-perpetuating.