In Amoeba nitrogenous wastes are expelled out through

Options

A. pseudopodia
B. hyaline cap
C. plasmalemma
D. contractile vacoule

Answer

### Step-by-Step Solution:

1. **Understanding the Organism**:
- Amoeba is a unicellular organism that performs all its life functions using its organelles.

2. **Identifying the Structures**:
- The key structures in Amoeba include the nucleus, food vacuole, and contractile vacuole.

3. **Function of the Contractile Vacuole**:
- The contractile vacuole is primarily responsible for two functions: osmoregulation and excretion. It helps maintain the osmotic balance of the cell and expels nitrogenous wastes.

4. **Process of Excretion**:
- After digestion occurs in the food vacuole, the nitrogenous wastes are collected by the contractile vacuole. The contractile vacuole then contracts, moving to the edge of the organism and expelling the waste outside.

5. **Evaluating the Options**:
- Option 1: **Pseudopodia** - These are used for locomotion, not excretion.
- Option 2: **Hyaline Cap** - This structure supports pseudopodia but does not play a role in excretion.
- Option 3: **Plasma Lemma** - This is the cell membrane and is not responsible for excretion.
- Option 4: **Contractile Vacuole** - This is the correct answer as it is responsible for expelling nitrogenous wastes.

6. **Conclusion**:
- The correct answer to the question "In Amoeba, nitrogenous wastes are expelled out through" is **Option 4: Contractile Vacuole**.