The bacterium $Bacillus$ $thuringiensis$ is widely used in contemporary biology as:

Consider the following statements:
$I$. Flavr Savr is a genetically modified tomato,which remains fresh and retains its flavour much longer than the normal tomato due to the blocking of the synthesis of the fruit-softening enzyme polygalacturonase.
$II$. Recently,the $US$ government has patented the Indian 'basmati' rice as Rice-tec.
$III$. Viruses,bacteria,and some other harmful organisms can be used as bioweapons in biological warfare.
Which of the statements given above are correct?

$Bt$ is resistant to .........

Which of the following is a transgenic plant?

The most extensively studied plant-microbe interaction is:

Anand Chakrabarty has used biotechnology for