Which is diploid structure?
(a) Pollen grains
(b) Egg
(c) Megaspore
(d) MMC

Options

A. Pollen grains
B. Egg
C. Megaspore
D. MMC.

Answer

To determine which of the given structures is diploid, we need to analyze each option based on their chromosomal composition.

1. **Understanding Diploid and Haploid**:
- Diploid (2n) means the structure has two sets of chromosomes.
- Haploid (n) means the structure has one set of chromosomes.

2. **Analyzing Each Option**:
- **(a) Pollen grains**:
- Pollen grains are the male gametes in plants and are haploid (n).
- **Conclusion**: Not diploid.

- **(b) Egg**:
- The egg cell is the female gamete and is also haploid (n).
- **Conclusion**: Not diploid.

- **(c) Megaspore**:
- Megaspores are produced in the ovule and give rise to the egg cell. They are haploid (n).
- **Conclusion**: Not diploid.

- **(d) MMC (Megaspore Mother Cell)**:
- The Megaspore Mother Cell is a diploid cell (2n) that undergoes meiosis to produce haploid megaspores.
- **Conclusion**: This is a diploid structure.

3. **Final Answer**:
- The correct option is (d) MMC, as it is the only diploid structure among the options provided.