Sexual mode of reproduction in protozoa is

Options

A. anisogamy
B. plasmogamy
C. plamotomy
D. schizogamy

Answer

To solve the question regarding the sexual mode of reproduction in protozoa, we will analyze the provided options step by step:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the sexual mode of reproduction in protozoa. Protozoa primarily reproduce asexually, but they can also reproduce sexually.

2. **Reviewing the Options**: The options given are:
- A) Anisogamy
- B) Plasmogamy
- C) Plasmodromy
- D) Schizogamy

3. **Analyzing Each Option**:
- **A) Anisogamy**: This refers to the fusion of gametes that are of different sizes (dissimilar). In protozoa, this is a recognized form of sexual reproduction, where typically a larger female gamete fuses with a smaller male gamete. This is indeed a sexual mode of reproduction.

- **B) Plasmogamy**: This is the fusion of the protoplasm of two cells and is primarily associated with fungi, not protozoa. This process occurs before karyogamy (fusion of nuclei) and is not considered a sexual reproduction method in protozoa.

- **C) Plasmodromy**: This is a type of asexual reproduction where a multinucleated cell divides without mitosis. It is also not a sexual reproduction method.

- **D) Schizogamy**: This is a form of asexual reproduction characterized by multiple fission, where a single cell divides into many daughter cells. This is commonly seen in protozoans like Plasmodium (the malaria-causing organism) and is not a sexual mode of reproduction.

4. **Conclusion**: After analyzing all the options, the only method that qualifies as a sexual mode of reproduction in protozoa is **Anisogamy**.

### Final Answer:
The sexual mode of reproduction in protozoa is **A) Anisogamy**.