Genetically modified plants are those that are:

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?

$Bt-$ cotton is resistant to:

Select the appropriate option for organisms used in biotechnology.

In $BT$ Cotton,which of the following is true?

In the year $.......$,an American company got a patent on $.......$ by the $US$ Patent and Trademark Office.