A
Controlling the viral diseases spread by mosquitoes
B
Converting crop residues into packing material
C
Producing biodegradable plastics
D
Producing biochar from thermochemical conversion of biomass
Correct answer: (a) Controlling the viral diseases spread by mosquitoes
Explanation
- A
Controlling the viral diseases spread by mosquitoes
Controlling mosquito-borne viral disease. Wolbachia-infected Aedes reduce dengue (and related) transmission.
- B
Converting crop residues into packing material
Crop residue to packing. Unrelated.
- C
Producing biodegradable plastics
Biodegradable plastics. Unrelated.
- D
Producing biochar from thermochemical conversion of biomass
Biochar. Unrelated.
Summary. Official key is (a). The Wolbachia method infects Aedes mosquitoes so that dengue, Zika and similar viruses replicate poorly, or so that incompatible males suppress the wild population. It is not a plastics or biochar technique.