Match the following columns
`{:("","Column-I","","Column-II"),(A,"Nyctinastry",1,"Opening of flowers"),(B,"Photonasty",2,"flowering,migration"),(C,"Tanning",3,"Darkening of skin"),(D,"Phenology",4,"Folding of leaves"):}`

Options

A. `{:(A,B,C,D),(2,3,4,1):}`
B. `{:(A,B,C,D),(4,1,3,2):}`
C. `{:(A,B,C,D),(3,2,4,1):}`
D. `{:(A,B,C,D),(3,1,2,4):}`

Answer

To solve the matching question, we need to correctly pair the terms in Column-I with their corresponding descriptions in Column-II based on their definitions and characteristics. Let's go through each term step by step.

### Step-by-Step Solution:

1. **Nyctinastry (A)**:
- Definition: Nyctinastry refers to the circadian rhythmic movements of plants in response to the onset of darkness.
- Match: This is related to the **Folding of leaves** (4) as plants close their leaves during the night and open them in the morning.
- **Match: A - 4**

2. **Photonasty (B)**:
- Definition: Photonasty is a type of nastic movement that occurs in response to changes in light intensity.
- Match: This corresponds to the **Opening of flowers** (1) as flowers may open or close depending on the light conditions.
- **Match: B - 1**

3. **Tanning (C)**:
- Definition: Tanning refers to the darkening of the skin, typically in response to sun exposure.
- Match: This directly relates to the **Darkening of skin** (3).
- **Match: C - 3**

4. **Phenology (D)**:
- Definition: Phenology is the study of periodic biological events, such as flowering and migration, in relation to climate and seasonal changes.
- Match: This corresponds to **Flowering, migration** (2).
- **Match: D - 2**

### Final Matches:
- A - 4 (Nyctinastry - Folding of leaves)
- B - 1 (Photonasty - Opening of flowers)
- C - 3 (Tanning - Darkening of skin)
- D - 2 (Phenology - Flowering, migration)

### Conclusion:
The correct answer is:
- **Option 2**: A matches with 4, B matches with 1, C matches with 3, and D matches with 2.