Match the items in 'Column-A' and 'column-B' and choose the correct answer .
`{:((i),"Column - A",,"Column - B"),((i) ,"Koel",A,"Methanobacterium"),((ii),"Mycorrhiza",B,"Trichoderma"),((iii),"Biological control",C,"Brood parasitism"),((iv),"Biogas",D,"Glomus"):}`
The correct answer is

Options

A. i-B , ii - D , iii - C , iv - A
B. i-C , ii - D , iii - B , iv - A
C. i-D , ii - A , iii - B , iv - C
D. i-C , ii - B , iii - A, iv - D

Answer

To solve the question of matching items from 'Column-A' with 'Column-B', we will analyze each item step by step.

### Step-by-Step Solution:

1. **Identify the first item in Column-A: Koel**
- The koel is known for its behavior of brood parasitism, where it lays its eggs in the nests of other birds, such as crows. This means that the koel relies on the crow to raise its young.
- **Match:** Koel (i) → Brood parasitism (C)

2. **Identify the second item in Column-A: Mycorrhiza**
- Mycorrhiza refers to a symbiotic association between fungi and plant roots. The genus Glomus is a well-known example of fungi that forms mycorrhizal relationships with higher plants.
- **Match:** Mycorrhiza (ii) → Glomus (D)

3. **Identify the third item in Column-A: Biological control**
- Biological control refers to the use of natural organisms to control pest populations. Trichoderma is a genus of fungi that is used as a biological control agent against certain plant pathogens.
- **Match:** Biological control (iii) → Trichoderma (B)

4. **Identify the fourth item in Column-A: Biogas**
- Biogas is primarily composed of methane, which is produced by methanogenic bacteria, specifically Methanobacterium. These bacteria are responsible for the anaerobic digestion process that generates biogas.
- **Match:** Biogas (iv) → Methanobacterium (A)

### Summary of Matches:
- (i) Koel → (C) Brood parasitism
- (ii) Mycorrhiza → (D) Glomus
- (iii) Biological control → (B) Trichoderma
- (iv) Biogas → (A) Methanobacterium

### Final Answer:
The correct matches are:
- (i) C
- (ii) D
- (iii) B
- (iv) A

Thus, the correct answer is **Option B**.