$BT$ cotton is not a ?

Transgenic plants are the ones

Main objective of production/use of herbicide resistant $GM$ crops is to
$(A)$ -Reduce herbicide accumulation in food articles for health safety.
$(B)$ -Eliminate weeds in the field without the use of herbicides.
$(C)$ -Eliminate weeds from the field without the use of manual labour.
$(D)$ -Soil pollution and biomagnification caused by herbicides.
Which of the following statements are correct?

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

Which one of the following is a correct statement?

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