Contractile vacuoles of Paramecium are analogous to

Options

A. Sweat glands of mammals
B. Uriniferous tubules
C. Gastrovascular cavity of Hydra
D. Typhlosole of Earthworm

Answer

To solve the question "Contractile vacuoles of Paramecium are analogous to," we need to analyze the function of contractile vacuoles and compare it to the options provided.

### Step-by-Step Solution:

1. **Understand the Function of Contractile Vacuoles**:
- Contractile vacuoles are specialized organelles found in certain protozoa, such as Paramecium. Their primary function is to regulate water balance by expelling excess water from the cell. This is crucial for maintaining osmotic balance in freshwater environments.

2. **Analyze the Options**:
- **Option A: Sweat glands of mammals**: These glands help in the excretion of excess water and salts through sweat, which is similar to the function of contractile vacuoles in Paramecium.
- **Option B: Uniferous tubules**: These are involved in excretion and osmoregulation in some invertebrates, but their function is not directly analogous to contractile vacuoles.
- **Option C: Gastrovascular cavity of Hydra**: This structure is involved in digestion and distribution of nutrients, not in water regulation.
- **Option D: Trifosol of earthworm**: This refers to the excretory system in earthworms, which functions differently from contractile vacuoles.

3. **Identify the Correct Analogy**:
- Since contractile vacuoles primarily function to expel excess water, the most analogous structure among the options is the sweat glands of mammals, which also serve to excrete excess water.

4. **Conclusion**:
- Therefore, the correct answer is **Option A: Sweat glands of mammals**.

### Final Answer:
Contractile vacuoles of Paramecium are analogous to **sweat glands of mammals**.

---