The megaspore mother cell is differentiated from one of the cells od the

Options

A. Nucellus
B. Pollen grain
C. Microporangia
D. Both (2) & (3)

Answer

To solve the question "The megaspore mother cell is differentiated from one of the cells of the:", we need to analyze the options provided and understand the context of the megaspore mother cell in plant reproduction.

### Step-by-Step Solution:

1. **Understanding the Megaspore Mother Cell**: The megaspore mother cell (also known as the megasporocyte) is a diploid cell that undergoes meiosis to produce four haploid megaspores. This process is crucial for the formation of female gametes in plants.

2. **Identifying the Source of the Megaspore Mother Cell**: The megaspore mother cell is derived from the tissue within the ovule. The specific tissue that gives rise to the megaspore mother cell is called the nucellus.

3. **Analyzing the Options**:
- **Nucellus**: This is the correct answer. It is the part of the ovule that contains the megaspore mother cell.
- **Pollen Grain**: This represents the male gametophyte and is not involved in the formation of the megaspore mother cell.
- **Microsporangia**: These are structures that produce microspores (male spores) and are also related to the male part of the plant, thus not relevant for the megaspore mother cell.
- **Both Second and Third**: Since both pollen grain and microsporangia are associated with male gametes, this option is incorrect.

4. **Conclusion**: Based on the analysis, the correct answer is the first option: **Nucellus**.

### Final Answer:
The megaspore mother cell is differentiated from one of the cells of the **nucellus**.

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