In which group of plant kingdom gametophyte is depend on sporophyte ?

Options

A. Algae
B. Bryophyta
C. Moss
D. Gymnosperm

Answer

To determine in which group of the plant kingdom the gametophyte is dependent on the sporophyte, we can analyze the life cycles of the different groups of plants mentioned: Algae, Bryophyta (mosses), and Gymnosperms.

### Step-by-Step Solution:

1. **Understanding Plant Life Cycles**:
- Plants exhibit two main phases in their life cycles: the haploid gametophyte phase and the diploid sporophyte phase.
- The gametophyte produces gametes (sperm and eggs), while the sporophyte produces spores through meiosis.

2. **Analyzing Algae**:
- Algae typically have a haplontic life cycle, meaning the dominant phase is the haploid gametophyte.
- In algae, the sporophyte is usually represented only by the zygote, which is a single cell and does not develop into a multicellular structure.
- Therefore, in algae, the gametophyte is not dependent on the sporophyte.

3. **Analyzing Bryophyta (Mosses)**:
- In bryophytes, the main plant body is the gametophyte, which is haploid and photosynthetic.
- The sporophyte is attached to the gametophyte and depends on it for nourishment. This means that the sporophyte cannot survive independently and relies on the gametophyte for sustenance.
- Thus, in bryophytes, the gametophyte is dominant, and the sporophyte is dependent on it.

4. **Analyzing Gymnosperms**:
- Gymnosperms have a dominant sporophyte phase, which is diploid and produces seeds.
- The gametophyte in gymnosperms is reduced and is dependent on the sporophyte for nutrition.
- Therefore, in gymnosperms, the gametophyte is not dominant and is dependent on the sporophyte.

5. **Conclusion**:
- The group of plants where the gametophyte is dependent on the sporophyte is **Gymnosperms**.
- Hence, the correct answer is Gymnosperms.

### Final Answer:
**Gymnosperms**