The three cells found in a pollen grain when it is shed at 3-celled stage are

Options

A. 1 vegetative cell, 1 generative cell, 1 male gamete
B. 1 vegatative cell, 2 male gametes
C. 1 generative cell, 2 male gametes
D. either (a) or (b)

Explanation

To answer the question regarding the three cells found in a pollen grain when it is shed at the 3-celled stage, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pollen Grain Structure**: A pollen grain is the male gametophyte in flowering plants. It typically develops from a microspore through a series of divisions.

2. **Meiosis Process**: Initially, the microspore undergoes meiosis, which results in the formation of two cells: one larger and one smaller.

3. **Cell Types Formation**:
- The larger cell formed is known as the **vegetative cell**.
- The smaller cell is called the **generative cell**.

4. **Generative Cell Division**: The generative cell undergoes a second division (mitosis) to produce two male gametes.

5. **Final Composition of Pollen Grain**: At the 3-celled stage, the pollen grain consists of:
- **One vegetative cell**
- **Two male gametes** (produced from the generative cell)

6. **Conclusion**: Therefore, the three cells found in a pollen grain when it is shed at the 3-celled stage are:
- One vegetative cell
- Two male gametes

### Final Answer:
The three cells found in a pollen grain when it is shed at the 3-celled stage are: **One vegetative cell and two male gametes**.