60 % of the angiosperms shed their pollens at the
(a) 2 celled stage
(b) 3 celled stage
(c) 4 celled stage
(d) 1 celled stage

Options

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

Answer

To solve the question regarding the stage at which 60% of angiosperms shed their pollen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Angiosperms**: Angiosperms are flowering plants. They produce pollen grains which are essential for reproduction.

2. **Identify Pollen Grain Stages**: Pollen grains can be shed at different developmental stages:
- **1-celled stage**: This is when the pollen grain consists of only one cell.
- **2-celled stage**: At this stage, the pollen grain has two cells: a vegetative cell and a generative cell.
- **3-celled stage**: This stage occurs when the generative cell has divided to form two male gametes, resulting in a total of three cells.
- **4-celled stage**: This is less common and not typically referenced in the context of pollen shedding.

3. **Analyze the Options**:
- **(a) 2-celled stage**: This is the most common stage for pollen shedding in angiosperms.
- **(b) 3-celled stage**: While some angiosperms shed pollen at this stage, it is not the majority.
- **(c) 4-celled stage**: This is not a typical stage for pollen shedding.
- **(d) 1-celled stage**: This stage is less common and not the majority.

4. **Conclusion**: Based on the information, 60% of angiosperms shed their pollen at the **2-celled stage**.

### Final Answer:
**(a) 2-celled stage**