Apical end of the cell of Euglenabears an invagination with three parts ____(a) , ____(b) , ____(c).

Options

A. Cytostome (a) - Cytopharynx (b) - Reservoir (c)
B. Mouth (a) - Gullet (b) - Cytopharynx (c)
C. Stigma (a) - Cytostome (b) - Gullet (c)
D. Contractile (a) - Gullet (b) - Reservoir (c)

Answer

To answer the question regarding the apical end of the cell of Euglena and its invagination parts, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Identify the Structure of Euglena**:
- Euglena is a unicellular organism that has a distinct structure at its apical end, which includes an invagination that serves as the mouth.

2. **Recognize the Three Parts**:
- The invagination at the apical end of Euglena consists of three main parts:
- **(a) Cytostome**: This is the mouth opening of Euglena where food enters.
- **(b) Cytopharynx**: This is a tube-like structure that connects the cytostome to the reservoir and is involved in the passage of food.
- **(c) Reservoir**: This part stores excess food after it has been processed.

3. **Confirm the Sequence**:
- The correct sequence of the three parts is:
- (a) Cytostome
- (b) Cytopharynx
- (c) Reservoir

4. **Final Answer**:
- Therefore, the complete answer to the question is:
- (a) Cytostome, (b) Cytopharynx, (c) Reservoir.