Match the following for PGR and their chemical nature and select the correct option.
`{:(,"Column I",,"Column I"),(A.,"IAA",i.,"Carotenoids"),(B.,"Kinetin",ii.,"Terpenes"),(C.,"ABA",iii,"Indole compounds"),(iv,"GA",iv.,"Adenine derivatives"):}`

Options

A. `(A - iii) , (B - iv) (C - i) (D - ii) `
B. `(A - i) , (B - iii) (C - ii) (D - iv) `
C. `(A - iv) , (B - ii) (C - iii) (D - i) `
D. `(A - ii) , (B - i) (C - iv) (D - iii) `

Answer

To solve the question of matching plant growth regulators (PGR) with their chemical nature, we will analyze each PGR in Column I and determine its corresponding chemical nature from Column II.

### Step-by-Step Solution:

1. **Identify IAA (Indole Acetic Acid)**:
- IAA is known as an auxin, which is a plant hormone that promotes growth.
- Chemical nature: IAA is classified as an **indole compound**.
- **Match**: A (IAA) → iii (Indole compounds)

2. **Identify Kinetin**:
- Kinetin is a type of cytokinin, which is another class of plant hormones.
- Chemical nature: Kinetin is an **adenine derivative**.
- **Match**: B (Kinetin) → iv (Adenine derivatives)

3. **Identify ABA (Abscisic Acid)**:
- ABA is a plant hormone that plays a role in stress responses and is often referred to as the stress hormone.
- Chemical nature: ABA is derived from **carotenoids**.
- **Match**: C (ABA) → i (Carotenoids)

4. **Identify GA (Gibberellic Acid)**:
- GA is a plant hormone that promotes stem elongation and seed germination.
- Chemical nature: GA is classified as a **terpene**.
- **Match**: D (GA) → ii (Terpenes)

### Final Matches:
- A (IAA) → iii (Indole compounds)
- B (Kinetin) → iv (Adenine derivatives)
- C (ABA) → i (Carotenoids)
- D (GA) → ii (Terpenes)

### Correct Option:
The correct option based on the matches is **Option 1**.

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