Amoeba sticks to substratum by means of

Options

A. Rough surface
B. Plasmalemma
C. Protein
D. None of the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Amoeba**: Amoeba is a unicellular organism that belongs to the kingdom Protista. It is characterized by its ability to change shape and move using extensions called pseudopodia.

2. **Identifying the Structure**: The outer covering of the amoeba is known as the plasma membrane or plasma lemma. This structure is crucial for the amoeba's interaction with its environment.

3. **Role of Plasma Lemma**: The plasma lemma contains numerous fine, ridge-like extensions. These extensions are important for various functions, including movement and adhesion.

4. **Adhesive Properties**: The fine ridge-like extensions on the plasma lemma have adhesive properties. This means they can stick to surfaces, allowing the amoeba to attach to a substratum.

5. **Function of Pseudopodia**: The extensions can also form pseudopodia, which are temporary projections of the cell. These pseudopodia not only help in movement but also assist in adhering to surfaces.

6. **Conclusion**: Therefore, amoeba sticks to the substratum primarily through the adhesive properties of the fine ridge-like extensions present on the plasma lemma.

**Final Answer**: Amoeba sticks to substratum by means of the plasma lemma.

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