In green algae -

Options

A. Some members show vegetative reproduction by fragmentation
B. Asexual reproduction by production of various spores
C. Sexual reproduction may be isogamous, anisogamous or oogamous.
D. All

Answer

To answer the question regarding green algae and their modes of reproduction, we can break down the information provided in the video transcript into a step-by-step solution.

### Step-by-Step Solution:

1. **Understanding Green Algae**:
- Green algae are simple, chlorophyll-bearing organisms that belong to the plant kingdom. They are autotrophic, meaning they can produce their own food through photosynthesis.

2. **Types of Reproduction in Green Algae**:
- Green algae can reproduce through three main methods: vegetative reproduction, asexual reproduction, and sexual reproduction.

3. **Vegetative Reproduction**:
- This process usually occurs through fragmentation. In fragmentation, the parent organism breaks into fragments, and each fragment can grow into a new individual. This is a common method of vegetative reproduction in green algae.

4. **Asexual Reproduction**:
- Asexual reproduction in green algae typically involves the production of flagellated zoospores. These zoospores are motile and are produced in specialized structures called zoosporangia. A single parent organism is involved in this type of reproduction.

5. **Sexual Reproduction**:
- Sexual reproduction in green algae can occur in three forms:
- **Isogamous**: This involves the fusion of gametes that are of similar size.
- **Anisogamous**: This involves the fusion of gametes that are of dissimilar sizes.
- **Oogamous**: This involves the fusion of a large, non-motile gamete (egg) with a small, motile gamete (sperm).

6. **Examples of Green Algae**:
- Examples of green algae include *Chlamydomonas*, *Chara*, and *Spirogyra*.

7. **Conclusion**:
- Based on the information provided, all statements regarding the types of reproduction in green algae (vegetative, asexual, and sexual) are correct. Therefore, the correct option is that all forms of reproduction are represented in green algae.