In Angiosperm, if haploid number of chromosome is 12 then what will be the no. of chromosomes in integuments and synergids

Options

A. 12, 12
B. 24, 12
C. 24, 24
D. 12, 24

Answer

To solve the question regarding the number of chromosomes in the integuments and synergids of an angiosperm with a haploid number of chromosomes being 12, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Chromosome Numbers**:
- In angiosperms, the haploid number of chromosomes (n) is given as 12. This means that the gametes (pollen and ovules) will have 12 chromosomes.

2. **Identify the Types of Cells**:
- The integuments are part of the ovule and are responsible for protecting it. They are formed from diploid tissue.
- The synergids are specialized cells located next to the egg cell in the female gametophyte. They are haploid cells.

3. **Determine the Chromosome Number for Synergids**:
- Since the synergids are haploid, they will have the same number of chromosomes as the haploid number of the organism. Therefore, the number of chromosomes in the synergids is:
\[ \text{Number of chromosomes in synergids} = n = 12 \]

4. **Determine the Chromosome Number for Integuments**:
- The integuments are diploid, which means they have double the haploid number of chromosomes. Therefore, the number of chromosomes in the integuments is:
\[ \text{Number of chromosomes in integuments} = 2n = 2 \times 12 = 24 \]

5. **Conclusion**:
- Thus, the number of chromosomes in the integuments is 24, and the number of chromosomes in the synergids is 12.

### Final Answer:
- **Number of chromosomes in integuments**: 24
- **Number of chromosomes in synergids**: 12