Fungus in Association with A is called lichen and in association with B is called mycorrhiza and A & B respectively

Options

A. 1)Algae & roots of vascular plants
B. 2)Bryophytes & roots of vascular plants
C. 3)Legumes & roots of vascular plants
D. 4)Pteridophytes & roots of vascular plants

Answer

To solve the question regarding the associations of fungi, we need to identify what "A" and "B" represent in the context of lichen and mycorrhiza. Let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding Lichen**:
- Lichen is a symbiotic association between a fungus and another organism.
- In this case, the other organism is typically an **alga** (or sometimes a cyanobacterium).
- Therefore, we can conclude that "A" is **alga**.

2. **Understanding Mycorrhiza**:
- Mycorrhiza refers to the association between a fungus and the roots of a vascular plant.
- This relationship is beneficial for both parties, where the fungus helps the plant absorb water and nutrients, while the plant provides organic compounds to the fungus.
- Hence, we can conclude that "B" is the **roots of vascular plants**.

3. **Final Identification**:
- Based on the above analysis, we identify:
- A = Alga
- B = Roots of vascular plants

4. **Choosing the Correct Option**:
- Among the options provided, the first option states "algae and roots of vascular plants," which correctly identifies A and B.
- The other options (bryophytes, legumes, and teridophytes) do not correctly represent the associations described.

### Final Answer:
- A = Alga
- B = Roots of vascular plants
- Correct option: **Option 1 (Algae and roots of vascular plants)**