Non-motile gametes are characteristically found in

Options

A. Cyanophyceae
B. Rhodophyceae
C. Phaeophyceae
D. Chlorophyceae

Answer

To solve the question "Non-motile gametes are characteristically found in," we will analyze the options provided: Cyanophyceae, Rhodophyceae, Pheophyceae, and Chlorophyceae.

### Step-by-Step Solution:

1. **Understanding Cyanophyceae**:
- Cyanophyceae refers to blue-green algae.
- They primarily reproduce through fragmentation and can produce non-motile spores.
- However, they do not have motile gametes.

2. **Understanding Rhodophyceae**:
- Rhodophyceae refers to red algae.
- Red algae are characterized by the absence of motile gametes, meaning they exclusively produce non-motile gametes in their life cycle.

3. **Understanding Pheophyceae**:
- Pheophyceae refers to brown algae.
- Brown algae typically have biflagellated zoospores, which are motile due to the presence of flagella.

4. **Understanding Chlorophyceae**:
- Chlorophyceae refers to green algae.
- Green algae also reproduce via flagellated zoospores, which are motile.

5. **Conclusion**:
- From the analysis, we see that both Cyanophyceae and Rhodophyceae can have non-motile spores, but only Rhodophyceae is characterized by the presence of non-motile gametes specifically.
- Pheophyceae and Chlorophyceae both have motile gametes.

Thus, the correct answer to the question is **Rhodophyceae**.

### Final Answer:
Non-motile gametes are characteristically found in **Rhodophyceae**.