Select the incorrect statement regarding reproduction in rhodophyceae.

Options

A. Asexual reproduction occurs by non-motile spores.
B. Sexual reproduction occurs by motile gamets.
C. Sexual reproduction is oogamous.
D. Complex post-fertilisation developmetal events occurs.

Explanation

To solve the question regarding the incorrect statement about reproduction in Rhodophyceae (red algae), we will analyze the provided information step by step.

### Step-by-Step Solution:

1. **Understanding Asexual Reproduction**:
- Asexual reproduction in Rhodophyceae occurs through non-motile spores. These spores are typically pear-shaped.
- **Hint**: Remember that asexual reproduction in Rhodophyceae does not involve movement; it relies on non-motile structures.

2. **Understanding Sexual Reproduction**:
- Sexual reproduction in Rhodophyceae also involves non-motile gametes. This means that the gametes do not have the ability to move on their own.
- **Hint**: Focus on the nature of gametes in Rhodophyceae; they are non-motile.

3. **Identifying Gamete Characteristics**:
- The gametes in Rhodophyceae are similar in size, which categorizes them under oogamous reproduction. Oogamous reproduction typically involves gametes that are similar in size, as opposed to anisogamous reproduction where they differ.
- **Hint**: Oogamous reproduction is characterized by gametes of similar size; keep this in mind when evaluating statements.

4. **Reproductive Organs**:
- Male reproductive organs are called antheridia, and female reproductive organs are known as carpogonia. The carpogonium has a long structure called the trichogyne, which facilitates the fusion of gametes.
- **Hint**: Remember the names of the reproductive organs and their functions; they are key to understanding the reproductive process.

5. **Fertilization Process**:
- Fertilization occurs when male gametes (spermatogonia) are transported to the female trichogyne through water. After fertilization, the female reproductive structure remains attached to the plant and develops into a carposporophyte.
- **Hint**: The role of water in transporting gametes is crucial; it is a key factor in the fertilization process.

6. **Evaluating the Options**:
- **Option A**: Asexual reproduction occurs by non-motile spores. (True)
- **Option B**: Sexual reproduction occurs by motile gametes. (Incorrect, as we established that gametes are non-motile)
- **Option C**: Sexual reproduction is oogamous. (True)
- **Option D**: Complex fertilization development events occur. (True)

7. **Conclusion**:
- The incorrect statement regarding reproduction in Rhodophyceae is **Option B**: "Sexual reproduction occurs by motile gametes."

### Final Answer:
The incorrect statement regarding reproduction in Rhodophyceae is **Option B**: "Sexual reproduction occurs by motile gametes."