Compare and contrast the advantages and disadvantages of production of genetically modified crops.

$RNA$ interference involves

Identify the incorrect statement.

$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine 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

Bt toxin protein crystals present in bacterium Bacillus thuringiensis, do not kill the bacteria themselves because

The scientific process by which crop plants are enriched with certain desirable nutrients is called