Assertion : Insect resistant transgenic cotton has been produced by inserting $Bt$ gene.
Reason : The $Bt$ gene is derived from a bacterium.

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?

$Bacillus \text{ } thuringiensis$ forms protein crystals which contain insecticidal protein. This protein

What is present in high amounts in golden rice?

Which of the following $Bt$ crops is being grown in India by the farmers?

$A$ transgenic food crop which may help in solving the problem of night blindness in developing countries is