Match the following columns.
`{:("","Column-I","","Column-II"),(A,"mesotherms",a,"arctic region"),(B,"Microtherms",b,"temperate region"),(C,"hekistotherms",c,"sub-tropical region"):}`

Options

A. `{:(A,B,C),(1,2,3):}`
B. `{:(A,B,C),(1,3,2):}`
C. `{:(A,B,C),(3,2,1):}`
D. `{:(A,B,C),(3,1,2):}`

Answer

To solve the matching question, we need to correctly associate the terms in Column-I with the appropriate descriptions in Column-II. Let's break down the terms and their meanings step by step.

### Step-by-Step Solution:

1. **Identify the terms in Column-I:**
- A: Mesotherms
- B: Microtherms
- C: Hekistotherms

2. **Understand the definitions:**
- **Mesotherms**: These are organisms that thrive in moderate temperatures. They typically require a warm environment for growth.
- **Microtherms**: These are organisms that are adapted to survive in cold environments. They are usually found in areas with low temperatures.
- **Hekistotherms**: These organisms are adapted to extremely cold conditions, often found in polar regions.

3. **Identify the regions in Column-II:**
- a: Arctic region
- b: Temperate region
- c: Sub-tropical region

4. **Match the terms with the appropriate regions:**
- **Mesotherms (A)**: Since they require moderate temperatures, they are best matched with the **sub-tropical region (c)**.
- **Microtherms (B)**: These organisms thrive in cold conditions, so they are best matched with the **arctic region (a)**.
- **Hekistotherms (C)**: These are cold-tolerant plants found in polar regions, so they are best matched with the **temperate region (b)**.

5. **Final Matching:**
- A (Mesotherms) → c (Sub-tropical region)
- B (Microtherms) → a (Arctic region)
- C (Hekistotherms) → b (Temperate region)

### Conclusion:
The correct matches are:
- A → c
- B → a
- C → b