If the nucellus cell of an Angiosperm contains 24 chromosomes the number of chromosome present in pollen grain. endosperm & embryo will be

Options

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

Answer

To solve the problem, we need to determine the number of chromosomes present in the pollen grain, endosperm, and embryo of an angiosperm, given that the nucellus cell contains 24 chromosomes.

### Step-by-Step Solution:

1. **Identify the ploidy level of the nucellus cell:**
- The nucellus cell is diploid (2n).
- Given that it contains 24 chromosomes, we can express this as:
\[ 2n = 24 \]

2. **Calculate the haploid number of chromosomes (n):**
- To find the haploid number (n), we divide the diploid number by 2:
\[ n = \frac{2n}{2} = \frac{24}{2} = 12 \]

3. **Determine the number of chromosomes in the pollen grain:**
- The pollen grain is a haploid structure, meaning it contains only one set of chromosomes (n).
- Therefore, the number of chromosomes in the pollen grain is:
\[ \text{Pollen grain} = n = 12 \]

4. **Determine the number of chromosomes in the endosperm:**
- The endosperm is a triploid structure (3n), formed from the fusion of one sperm cell with two polar nuclei during fertilization.
- Thus, the number of chromosomes in the endosperm is:
\[ \text{Endosperm} = 3n = 3 \times 12 = 36 \]

5. **Determine the number of chromosomes in the embryo:**
- The embryo is also a diploid structure (2n), formed from the fertilization of an egg cell by a sperm cell.
- Therefore, the number of chromosomes in the embryo is:
\[ \text{Embryo} = 2n = 24 \]

### Final Answer:
- The number of chromosomes present in the pollen grain, endosperm, and embryo is:
- Pollen grain: 12
- Endosperm: 36
- Embryo: 24

Thus, the correct answer is **12, 36, 24**.