Non-motile gametes are characteristically found in

Options

A. Chrysophyta
B. Rhodophyta
C. Phaeophyta
D. Chlorophyta

Answer

To solve the question "Non-motile gametes are characteristically found in," we will analyze the options provided and determine which group of organisms has non-motile gametes.

### Step-by-Step Solution:

1. **Understanding Non-Motile Gametes**:
- Non-motile gametes are those that do not have flagella, meaning they cannot move independently.

2. **Analyzing the Options**:
- **Option A: Chrysophyta**:
- Chrysophyta, also known as golden algae, are typically unicellular and possess flagella. Therefore, they have motile gametes.
- **Conclusion**: This option is incorrect.

- **Option B: Rhodophyta**:
- Rhodophyta, or red algae, are characterized by the presence of the pigment phycorythrin. Importantly, they do not have flagella, which means their gametes are non-motile.
- **Conclusion**: This option is correct.

- **Option C: Phaeophyta**:
- Phaeophyta, or brown algae, typically have gametes that possess flagella (usually two). Thus, they are motile.
- **Conclusion**: This option is incorrect.

- **Option D: Chlorophyta**:
- Chlorophyta, or green algae, contain chlorophyll A and B and usually have 2 to 8 flagella. Therefore, their gametes are also motile.
- **Conclusion**: This option is incorrect.

3. **Final Answer**:
- Based on the analysis, the group that characteristically has non-motile gametes is **Option B: Rhodophyta**.

### Summary:
The correct answer to the question is **Rhodophyta**, as they are characterized by non-motile gametes due to the absence of flagella.