The number of chromosomes in radicle is 16. What will be number of chromosomes in pollen tube nucleus, antipodals , secondary nucleus of endosperm respectively ?

Options

A. 8,8,16,24
B. 8,8,16,16
C. 16,16,32,48
D. 8,8,16,48

Answer

To solve the question regarding the number of chromosomes in the pollen tube nucleus, antipodals, and secondary nucleus of endosperm given that the number of chromosomes in the radicle is 16, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chromosome Number in Radicle:**
- The number of chromosomes in the radicle is given as 16. This represents the diploid (2n) number of chromosomes.
- Therefore, we can write:
\[ 2n = 16 \]

2. **Calculate the Haploid Number (n):**
- To find the haploid number (n), we divide the diploid number by 2:
\[ n = \frac{2n}{2} = \frac{16}{2} = 8 \]

3. **Determine the Number of Chromosomes in the Pollen Tube Nucleus:**
- The pollen tube nucleus is haploid (n), so:
\[ \text{Pollen Tube Nucleus} = n = 8 \]

4. **Determine the Number of Chromosomes in Antipodal Cells:**
- Antipodal cells are also haploid (n), hence:
\[ \text{Antipodal Cells} = n = 8 \]

5. **Determine the Number of Chromosomes in the Secondary Nucleus of Endosperm:**
- The secondary nucleus of the endosperm is diploid (2n), which is formed by the fusion of one sperm nucleus with two polar nuclei:
\[ \text{Secondary Nucleus} = 2n = 16 \]

6. **Determine the Number of Chromosomes in the Endosperm:**
- The endosperm is triploid (3n), which is formed by the fusion of one sperm nucleus with two polar nuclei:
\[ \text{Endosperm} = 3n = 3 \times 8 = 24 \]

### Final Answer:
- The number of chromosomes in the pollen tube nucleus, antipodal cells, and secondary nucleus of endosperm respectively are:
- Pollen Tube Nucleus: 8
- Antipodal Cells: 8
- Secondary Nucleus of Endosperm: 16

### Summary:
- The answer is: **Pollen Tube Nucleus: 8, Antipodal Cells: 8, Secondary Nucleus of Endosperm: 16.**