Generative cell , nucellus , antipodals , stigma, embryo, endosperm , secondary nucleus , megaspore
How many of the above are haploid ?

Options

A. 2
B. 3
C. 4
D. 5

Answer

To determine how many of the given terms are haploid, we will analyze each term one by one:

1. **Generative Cell**:
- The generative cell is haploid (n). It is formed from the microspore during the development of pollen grains.

2. **Nucellus**:
- The nucellus is diploid (2n). It is the central part of the ovule, which contains the megasporangium.

3. **Antipodals**:
- Antipodal cells are haploid (n). They are found at the opposite end of the embryo sac from the micropyle.

4. **Stigma**:
- The stigma is diploid (2n). It is part of the pistil in flowering plants and is involved in the reception of pollen.

5. **Embryo**:
- The embryo is diploid (2n). It develops from the zygote after fertilization.

6. **Endosperm**:
- The endosperm is triploid (3n) in angiosperms. It is formed from the fusion of one sperm cell with two polar nuclei. In gymnosperms, it can be haploid (n), but since the question does not specify, we will consider the common case of angiosperms.

7. **Secondary Nucleus**:
- The secondary nucleus is diploid (2n). It is formed by the fusion of two polar nuclei in the embryo sac.

8. **Megaspore**:
- The megaspore is haploid (n). It develops into the female gametophyte (embryo sac) after meiosis.

Now, let's summarize the haploid and diploid cells:

- **Haploid (n)**: Generative cell, Antipodals, Megaspore
- **Diploid (2n)**: Nucellus, Stigma, Embryo, Secondary nucleus
- **Triploid (3n)**: Endosperm (in angiosperms)

Counting the haploid cells, we find:
- Generative Cell: 1
- Antipodals: 1
- Megaspore: 1

Total haploid cells = 3

Thus, the answer to the question is **3**.