Ploidy in wing of pollen grain and wing of seed of Pinus is

Options

A. x in pollen grain and 2x in seed
B. 2x in pollens and 2x in seed
C. being an outgrowth, chromosomes are absent
D. 1/2 x in wing of pollens and polyploidy in seed.

Answer

To determine the ploidy in the wing of the pollen grain and the wing of the seed of Pinus, we need to understand the reproductive structures and processes involved in the life cycle of this plant.

### Step-by-Step Solution:

1. **Understanding Ploidy Levels**:
- Ploidy refers to the number of sets of chromosomes in a cell. In plants, the haploid (n) stage is represented by gametes, while the diploid (2n) stage is represented by the zygote and the sporophyte.

2. **Pollen Grain Formation**:
- In Pinus, the male cones produce microspores through meiosis. Each microspore is haploid (n), which means that the pollen grain, derived from these microspores, is also haploid. Therefore, the ploidy level of the pollen grain is **X (haploid)**.

3. **Seed Formation**:
- The female cones of Pinus contain megasporophylls that produce megaspores. After meiosis, one of the megaspores develops into a female gametophyte, which is also haploid. However, when fertilization occurs, the male and female gametes (both haploid) fuse to form a diploid zygote. This zygote develops into the seed. Thus, the ploidy level of the seed is **2X (diploid)**.

4. **Wings of Pollen and Seed**:
- The wings of the pollen grain and seed are extensions that help in dispersal. The wings themselves do not have a separate ploidy level; they are part of the pollen grain and seed structure. Therefore, the ploidy of the wings corresponds to the ploidy of the pollen grain and seed they are attached to.

5. **Conclusion**:
- The ploidy in the wing of the pollen grain is X (haploid), and the ploidy in the wing of the seed is 2X (diploid).

### Final Answer:
- The ploidy in the wing of the pollen grain of Pinus is **X**, and in the wing of the seed, it is **2X**.