A hypothetical chemical involved in the following of plants is or chemical agent which has important role in flowering is

Options

A. (a) Gibberellin
B. (b) NAA
C. (c) Florigen
D. (d) IAA

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a hypothetical chemical that plays an important role in the flowering of plants. We need to identify which of the given options is related to flowering.

2. **Analyzing the Options**:
- **Option A: Gibberellin**: This is a phytohormone known for its role in promoting stem elongation, seed germination, and breaking dormancy. It does not primarily initiate flowering.
- **Option B: NAA (Naphthalene Acetic Acid)**: This is a synthetic auxin that promotes root growth and is used in horticulture. It is not involved in flowering.
- **Option C: Florigen**: This is a hypothetical hormone that is believed to be responsible for the flowering process. It is synthesized in the leaves and transported to the shoot apical meristem to promote flowering.
- **Option D: IAA (Indole Acetic Acid)**: This is another auxin that primarily influences shoot growth and is not directly involved in flowering.

3. **Identifying the Correct Answer**: From the analysis, it is clear that Florigen (Option C) is the only chemical mentioned that is directly involved in the process of flowering in plants.

4. **Conclusion**: Therefore, the correct answer to the question is **C: Florigen**.