Which of the following is false for $Bt$ transgenic plants?

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?

In plant cells,mutation can be induced by which of the following?

Genetically modified plants are those that are:

Which of the following statements is correct regarding $Bt$ toxin?

Production of pest-resistant plants could