Hydra does not feed on lower animals because

Options

A. They are so small
B. They are distasteful
C. They lack glutathione
D. None of the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Hydra's Feeding Mechanism**:
- Hydra is a member of the phylum Coelenterata and class Hydrozoa. It has specialized structures called tentacles that are used for capturing prey.

2. **Identifying the Options**:
- The question provides four options regarding why Hydra does not feed on lower animals:
a. They are too small.
b. They are distasteful.
c. They lack glutathione.
d. None of the above.

3. **Analyzing Each Option**:
- **Option a**: "They are so small" - This is incorrect because size alone does not determine whether Hydra can capture and feed on an animal.
- **Option b**: "They are distasteful" - This is also incorrect as distastefulness does not prevent Hydra from feeding; it can still capture prey.
- **Option c**: "They lack glutathione" - This is the correct option. Hydra relies on the presence of glutathione, which is a chemical substance released by its prey. If the lower animals lack glutathione, Hydra cannot effectively feed on them.
- **Option d**: "None of the above" - This is incorrect as we have identified option c as the correct answer.

4. **Conclusion**:
- Based on the analysis, the correct answer is that Hydra does not feed on lower animals because they lack glutathione.

**Final Answer**: They lack glutathione.

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