Which of the following is centric type golden brown photosynthetic protist with radial symmetry?

Options

A. Melosira
B. Navicula
C. Ceratium
D. Pyrocystis

Answer

To solve the question, "Which of the following is a centric type golden brown photosynthetic protist with radial symmetry?", we can follow these steps:

### Step 1: Understand the Characteristics
- We need to identify a protist that is:
- Centric type
- Golden brown in color
- Photosynthetic
- Exhibiting radial symmetry

### Step 2: Analyze the Options
- The options given are:
1. Melocera
2. Navicula
3. Ceratium
4. Pyrrhosis

### Step 3: Evaluate Each Option
- **Melocera**:
- It is a golden brown photosynthetic protist.
- It has a circular shape, which indicates radial symmetry.
- This option fits all the criteria mentioned in the question.

- **Navicula**:
- Known as a boat-shaped protist, which suggests it has bilateral symmetry, not radial symmetry.

- **Ceratium**:
- This is a type of dinoflagellate, which typically does not exhibit radial symmetry.

- **Pyrrhosis**:
- This organism is non-motile and also does not exhibit radial symmetry.

### Step 4: Conclusion
- Based on the analysis, the only option that meets all the criteria of being a centric type, golden brown, photosynthetic protist with radial symmetry is **Melocera**.

### Final Answer
- The correct answer is **Melocera**.

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