Match the items in Column ‘A’ and Column ‘B’ and choose the correct answer.
The correct answer is:
a. A-ii, B-iv, C-iii, D-i
b. A-iii, B-iv, C-ii, D-i
c. A-iv, B-i, C-ii, D-iii
d. A-iii, B-ii, C-i, D-iv

Column I A. Ladybird B. Mycorrhiza C. Biological control D. Biogas

Column II i. Methane bacterium ii. Trichoderma iii. Aphids iv. Glomus

Solution: The ladybird beetle is a biological pest control agent for aphids. Glomus is a genus of arbuscular mycorrhizal fungi that create a mycorrhizal symbiotic association with plant roots. Trichoderma is a biological control agent used to combat pathogenic fungi of several species. Biogas is made up of methane, which is produced by methane bacterium. So, the correct answer is option (b).