In anisogamous type of sexual reproduction in algae

Options

A. Fusion takes place between morphologically and physiologically distinct gametes
B. Fusion takes place between morphologically similar and physiologically distinct gametes
C. Fusion takes place between physiologically similar and morphologically distinct gametes
D. Fusion of two gametes of same mother cell

Answer

### Step-by-Step Solution:

1. **Understanding Anisogamy**:
- Anisogamous reproduction involves two types of gametes that are morphologically and physiologically distinct. This means that the male and female gametes differ in structure and function.

2. **Identifying Gametes**:
- In anisogamy, the male gamete is typically motile (often possessing flagella), while the female gamete is non-motile. This distinction is crucial in understanding the reproductive process.

3. **Comparison with Other Types**:
- It’s important to differentiate anisogamy from isogamy and oogamy:
- **Isogamy**: Both gametes are similar in size and shape (morphologically and physiologically identical).
- **Oogamy**: A specific type of anisogamy where the female gamete is large, non-motile, and the male gamete is small and motile.

4. **Examples in Algae**:
- Anisogamous reproduction can be observed in certain species of algae, such as some species of Chlamydomonas. In these species, the male and female gametes exhibit the distinct characteristics mentioned above.

5. **Conclusion**:
- Therefore, in anisogamous reproduction in algae, the fusion occurs between two distinct gametes that differ in morphology and physiology.