I. Recombinant DNA technolgy is used to improve crop plants by increasing their productivity, by making them more nutritious and by developing disease resistant
II Bt cotton is resistance to bollworm infestation
III. Bacillus thuringiensis is not harmed by self cry protein because of its occurrence as protoxin (inactive)
V. Protoxin Cry protein is changed into active cry protein in the stomach of insects due to alkaline pH in stomach