cry $II$ Ab and cry $I$ Ab produce toxins that control

Injecting functional adenosine deaminase into a patients (lacking $ADA$ gene) blood cells may be considered as

A genetically engineered micro­organism used successfully in bioremediation of oil spills is a species of

Anand Chakrabarty has used biotechnology for

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?