There are 16 chromosomes in a vegetative cell of pea plant. How many chromosomes will be in the following:
(i) Pollen grain (ii) Endosperm (iii) Antipodal (iv) Egg cell

Answer

To solve the question regarding the number of chromosomes in different structures of the pea plant, we start with the information provided:

1. **Understanding the Chromosome Number**:
- The vegetative cell of the pea plant has 16 chromosomes, which indicates that it is a diploid (2N) cell. Therefore, N (haploid number) = 16/2 = 8.

2. **Calculating Chromosome Numbers for Each Structure**:
- (i) **Pollen Grain**:
- Pollen grains are male gametes and are haploid. Therefore, the number of chromosomes in a pollen grain = N = 8.

- (ii) **Endosperm**:
- The endosperm is formed by the fusion of one sperm cell with two polar nuclei (triple fusion), making it triploid (3N). Therefore, the number of chromosomes in the endosperm = 3N = 3 × 8 = 24.

- (iii) **Antipodal Cells**:
- Antipodal cells are found in the embryo sac and are also haploid. Therefore, the number of chromosomes in the antipodal cells = N = 8.

- (iv) **Egg Cell**:
- The egg cell is a female gamete and is haploid. Therefore, the number of chromosomes in the egg cell = N = 8.

3. **Summary of Chromosome Numbers**:
- Pollen grain: 8 chromosomes
- Endosperm: 24 chromosomes
- Antipodal cells: 8 chromosomes
- Egg cell: 8 chromosomes

### Final Answers:
- (i) Pollen grain: 8 chromosomes
- (ii) Endosperm: 24 chromosomes
- (iii) Antipodal: 8 chromosomes
- (iv) Egg cell: 8 chromosomes