Transgenic plants are the ones $:-$

By applying which of the following practices,contamination of hydroponics plants can be reduced?

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?

Crystals of $Bt$ toxin produced by some bacteria do not kill the bacteria themselves because . . . . . .

$Meloidogyne$ $incognita$,which infects the roots of tobacco plants causing a great reduction in yield,is a:

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