At the time of dehiscence winged pollen grain of Pinus is

Options

A. 1 celled
B. 4 celled
C. 3 celled
D. 2 celled

Answer

To solve the question regarding the state of winged pollen grains of Pinus at the time of dehiscence, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Dehiscence":**
- Dehiscence refers to the process of splitting or opening, which in this context relates to pollen grains releasing their contents.

2. **Identify the Type of Plant:**
- Pinus is a genus of trees that belongs to the Gymnosperms category. Understanding that Pinus is a Gymnosperm is crucial for knowing its reproductive structures.

3. **Know the Structure of Pollen Grains:**
- Pollen grains are the male gametophytes in seed plants. In Gymnosperms like Pinus, the pollen grain undergoes development and reaches a specific cellular structure before it is shed.

4. **Determine the Cellular Stage at Dehiscence:**
- In the case of Pinus, the pollen grains are shed at a 4-celled stage. This means that when they are released, they consist of four distinct cells.

5. **Identify the Types of Cells Present:**
- The four cells in the pollen grain of Pinus include:
- Two prothallial (vegetative) cells.
- One generative cell.
- One tube cell.
- This composition confirms that the pollen grain is indeed at a 4-celled stage at the time of dehiscence.

6. **Conclusion:**
- Therefore, the correct answer to the question is that at the time of dehiscence, the winged pollen grain of Pinus is 4-celled.

### Final Answer:
The winged pollen grain of Pinus is 4-celled at the time of dehiscence.

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