Red tides in Medeterranian sea are caused by

Options

A. Chrysoplytes
B. Monerans
C. Dinoflagellates
D. Mycoplasmas

Answer

**Step-by-Step Solution:**

1. **Understanding Red Tides**: Red tides are phenomena where coastal waters become discolored, often appearing red or brown due to the presence of certain microorganisms.

2. **Identifying the Organisms**: The question asks about the cause of red tides specifically in the Mediterranean Sea. We need to identify which group of organisms is responsible for this phenomenon.

3. **Reviewing the Options**:
- A. Chrysophytes: These are primarily golden-brown algae and are not known for causing red tides.
- B. Monerans: This group includes bacteria, which are not typically associated with red tides.
- C. Dinoflagellates: These are a class of protists that are known to cause red tides due to their ability to multiply rapidly and produce pigments that can color the water.
- D. Mycoplasmas: These are a type of bacteria that do not cause red tides.

4. **Focusing on Dinoflagellates**: Dinoflagellates are marine and photosynthetic organisms. They can have various pigments, which can lead to different colors in the water, including red.

5. **Mechanism of Red Tide Formation**: Certain species of dinoflagellates, such as Gonyaulax, can undergo rapid multiplication under favorable conditions (like nutrient availability), leading to a significant increase in their population density, which causes the water to appear red.

6. **Conclusion**: Based on the information, the correct answer is C. Dinoflagellates, as they are the organisms responsible for causing red tides in the Mediterranean Sea.

**Final Answer**: C. Dinoflagellates

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