Number of chromosomes is 24 in nucellus. Number of chromosomes in microspore mother cell would be
(a) 36
(b) 24
(c) 30
(d) 12

Options

A. 36
B. 24
C. 30
D. 12

Explanation

To solve the question regarding the number of chromosomes in the microspore mother cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- The **nucellus** is a part of the ovule and is involved in the formation of the female gametes (egg cells).
- The **microspore mother cell** (also known as pollen mother cell) is responsible for producing microspores, which develop into pollen grains containing male gametes.

2. **Identify the Ploidy Level**:
- The nucellus is diploid (2n), meaning it has two sets of chromosomes. In this case, it is given that the number of chromosomes in the nucellus is 24.
- Since the nucellus is diploid, we can conclude that it has 2n = 24.

3. **Determine the Chromosome Number in Microspore Mother Cell**:
- The microspore mother cell is also diploid (2n) as it is part of the microsporangium, similar to the nucellus.
- Therefore, the number of chromosomes in the microspore mother cell will also be 24 (2n = 24).

4. **Conclusion**:
- Since both the nucellus and the microspore mother cell are diploid and have the same number of chromosomes, the number of chromosomes in the microspore mother cell is 24.

### Final Answer:
(b) 24

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