Which one of the following is a genetically improved bacterium used for pollution control?

Identify the incorrect statement.
$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosene and sprayed on to vulnerable plants.
$(ii)$ $B. thuringiensis$ are used to control butterfly caterpillars,but leave other insects unharmed.
$(iii)$ The toxin of $B. thuringiensis$ is released in the blood of larvae and the larvae get killed.
$(iv)$ By the development of methods of genetic engineering,$B. thuringiensis$ toxin genes have been introduced into plants.

The fish used for the control of mosquitoes,known as the larvicidal fish,is ..............

What should be done to eliminate mosquito larvae in a pond?

Describe the main ideas behind the biological control of pests and diseases.

Which microorganism is used to control pests that are harmful to cotton?