A
clonal propagation of crop plants
B
developing genetically modified crop plants
C
production of plant growth substances
D
production of biofertilizers
Correct answer: (b) developing genetically modified crop plants
Explanation
- A
clonal propagation of crop plants
Clonal propagation. Tissue culture, not Bt cotton events.
- B
developing genetically modified crop plants
Genetically modified crop plants. Monsanto Bollgard I (Cry1Ac) and Bollgard II (Cry1Ac + Cry2Ab) Bt cotton.
- C
production of plant growth substances
Plant growth substances. Hormones, not these names.
- D
production of biofertilizers
Biofertilizers. Unrelated.
Summary. Official key is (b). Bollgard I and II are Bt cotton events — genetically modified insect-resistant plants, not cloning, hormones or biofertilizer.