Gemmae are means of vegetative reproduction in

Options

A. Colocasia
B. Spirogyra
C. Marsilea
D. Marchantia

Answer

To solve the question regarding which organism uses gemmae as a means of vegetative reproduction, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Gemmae**:
- Gemmae are green multicellular asexual buds that are involved in vegetative reproduction. They are produced in special structures known as gemma cups.

**Hint**: Remember that gemmae are asexual reproductive structures found in certain plants.

2. **Identifying the Organisms**:
- The options provided are:
- Colocasia
- Spirogyra
- Marcantia
- Marchantia

3. **Analyzing Each Option**:
- **Colocasia**: This is a flowering plant and does not reproduce through gemmae.
- **Spirogyra**: This is a filamentous green algae that reproduces mainly through fragmentation and conjugation, not gemmae.
- **Marchantia**: This is a type of liverwort that reproduces vegetatively through gemmae. It has specialized structures called gemma cups where gemmae are produced.
- **Marcantia**: This seems to be a typographical error and likely refers to Marchantia, which is indeed correct.

4. **Conclusion**:
- The organism that uses gemmae for vegetative reproduction is **Marchantia**. Therefore, the correct answer is option 4.

### Final Answer:
**Marchantia**