If the endosperm of an angiosperm has 24 chromosomes, what would be the number of chromosomes in the megaspore mother cell of the same plant ?

Options

A. 8
B. 16
C. 24
D. 32

Answer

To determine the number of chromosomes in the megaspore mother cell of an angiosperm, given that the endosperm has 24 chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chromosome Count in Endosperm**:
- The problem states that the endosperm has 24 chromosomes.

2. **Determine the Ploidy Level of Endosperm**:
- The endosperm is triploid (3N). This means it has three sets of chromosomes.

3. **Calculate the Value of N**:
- Since the endosperm is 3N and has 24 chromosomes, we can set up the equation:
\[ 3N = 24 \]
- To find N, divide both sides by 3:
\[ N = \frac{24}{3} = 8 \]

4. **Identify the Ploidy Level of the Megaspore Mother Cell**:
- The megaspore mother cell (also known as the megasporangium) is diploid (2N). This is because it undergoes meiosis to produce haploid (N) megaspores.

5. **Calculate the Number of Chromosomes in the Megaspore Mother Cell**:
- Since we found that N = 8, we can now calculate the number of chromosomes in the megaspore mother cell:
\[ 2N = 2 \times 8 = 16 \]

6. **Conclusion**:
- Therefore, the number of chromosomes in the megaspore mother cell is **16**.

### Final Answer:
The number of chromosomes in the megaspore mother cell of the same plant is **16**.

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