Give the ploidy of following structures in angiospermic plants
Zygote, Endosperm, Ovum

Options

A. n,nn2n
B. 2n,2n,n
C. 2n,3n,n
D. 2n,n,2n

Answer

To determine the ploidy of the following structures in angiospermic plants: zygote, endosperm, and ovum, we can analyze each structure step by step.

### Step-by-Step Solution:

1. **Zygote**:
- The zygote is formed by the fusion of male and female gametes during fertilization.
- Both the male gamete (sperm) and the female gamete (ovum) are haploid (N).
- When these two haploid gametes fuse, they create a diploid zygote.
- Therefore, the ploidy of the zygote is **2N** (diploid).

2. **Endosperm**:
- In angiosperms, a process called double fertilization occurs.
- During this process, one sperm fertilizes the egg nucleus to form the diploid zygote (2N), while the other sperm fuses with two polar nuclei to form the endosperm.
- This fusion results in a triploid structure because it combines three sets of chromosomes (two from the polar nuclei and one from the sperm).
- Therefore, the ploidy of the endosperm is **3N** (triploid).

3. **Ovum**:
- The ovum is the female gamete in angiospermic plants.
- As a gamete, it is haploid in nature, meaning it contains one set of chromosomes.
- Therefore, the ploidy of the ovum is **N** (haploid).

### Summary of Ploidy Levels:
- Zygote: **2N** (diploid)
- Endosperm: **3N** (triploid)
- Ovum: **N** (haploid)

### Final Answer:
The ploidy levels of the structures are:
- Zygote: 2N
- Endosperm: 3N
- Ovum: N

The correct option is **C: 2N, 3N, N**.