Food of sea urchins is

Options

A. Planktons
B. Dead fishes, algae etc.
C. Star fishes
D. Oysters

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: Sea urchins belong to the phylum Echinodermata and the class Echinoidea. Understanding their classification helps in knowing their biological characteristics and feeding habits.

2. **Understand Feeding Habits**: Sea urchins are known to lead a predatory lifestyle. They are heterotrophic organisms, meaning they cannot produce their own food and must rely on other sources for sustenance.

3. **Types of Food**: Sea urchins primarily feed on algae and dead fish. They are unable to catch live fish due to their lack of predatory adaptations, such as specialized organs for capturing prey.

4. **Feeding Mechanism**: The globular shape of sea urchins allows them to easily track and engulf dead fish and algae that float in their environment. They do not have the capability to chase live prey, which is why they consume only what is already dead or available in their habitat.

5. **Conclusion**: Based on their feeding habits, the correct answer to the question "Food of sea urchins is" would be algae and dead fish.

**Final Answer**: The food of sea urchins is algae and dead fish.

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