$Meloidegyne incognitia$ infects the root of tobacco and decreases its yield.

The genetically modified $(GM)$ brinjal in India has been developed for

Consider the following statements about $Bt$:
$I.$ The bacteria $Bacillus$ $thuringiensis$ $(Bt)$ are used to control butterfly caterpillars.
$II.$ Fresh spores of $Bt$ are mixed with water and sprayed on crops such as brassicas and fruit trees.
$III.$ Insect larvae,after eating these,are killed by the toxin released in their gut.
$IV.$ $Bt$ toxin genes have been introduced into plants to provide resistance to pests.
Which of the statements given above are correct?

The first genetically modified plant commercially released in India is:

Cry proteins are obtained from $......$.

Transgenic plants are mainly developed to be resistant to which of the following?