Flagella are absent in

Options

A. Chlorophyta
B. Cyanophyta
C. Phaeophyta
D. Euglenophyta.

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks in which group of organisms flagella are absent. Flagella are whip-like structures that help in locomotion.

2. **Identify the Options**: The options provided are:
- Chlorophyta
- Sinophyta
- Pheophyta
- Urinophyta

3. **Define Each Group**:
- **Chlorophyta**: This group includes green algae, which typically have flagella.
- **Sinophyta**: This refers to cyanobacteria, which are photosynthetic bacteria. They are known to lack flagella.
- **Pheophyta**: This group consists of brown algae, which usually possess flagella.
- **Urinophyta**: This is not a commonly recognized group in biological classification, but it may refer to a specific type of algae or organism.

4. **Analyze the Information**: Among the options, Sinophyta (cyanobacteria) is known for lacking flagella. This is a key characteristic that distinguishes them from other groups listed.

5. **Conclude the Answer**: Based on the analysis, the correct answer is **Sinophyta**, as flagella are absent in this group.

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