Select correct w.r.t. diplohaplontic life cycle

Options

A. Found in Polysiphonia and Gnetum
B. Both gametophyte and sporophyte phases are present
C. Common in green algae
D. Gametic meiosis occurs

Answer

### Step-by-Step Solution:

1. **Understanding the Diplohaplontic Life Cycle**:
- The diplohaplontic life cycle, also known as the alternation of generations, involves two distinct phases: the diploid sporophyte and the haploid gametophyte.
- The sporophyte (2n) produces haploid spores (n) through meiosis. These spores develop into gametophytes.

2. **Production of Gametes**:
- The gametophyte (n) produces gametes (also n) through gametogenesis.
- When two gametes fuse during fertilization (syngamy), they form a diploid zygote (2n), which then develops into a new sporophyte.

3. **Evaluating the Statements**:
- **Statement 1**: "It is found in Polysiphonia and Genetum."
- Polysiphonia is an alga that exhibits a diplohaplontic life cycle, but Genetum is a gymnosperm that follows a diplontic life cycle. Therefore, this statement is **incorrect**.

- **Statement 2**: "Both gametophyte and sporophyte phases are present."
- This statement is true as both phases are integral to the diplohaplontic life cycle.

- **Statement 3**: "It is common in green algae."
- This statement is **false**; the diplohaplontic life cycle is not commonly found in green algae.

- **Statement 4**: "Gametic meiosis occurs."
- This statement is also **incorrect** because meiosis occurs during the formation of spores, not gametes.

4. **Conclusion**:
- The only correct statement regarding the diplohaplontic life cycle is that both gametophyte and sporophyte phases are present.

### Final Answer:
The correct statement with respect to the diplohaplontic life cycle is: **Both gametophyte and sporophyte phases are present.**

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