Which one of the following locomotary structures occurs in sporozoa ?

Options

A. Cilia
B. Pseudopodia
C. Flagella
D. None of the above.

Answer

To answer the question regarding the locomotory structures in Sporozoa, we need to analyze the options provided:

1. **Cilia**: Cilia are hair-like structures that facilitate movement in certain protozoans, specifically in the group known as ciliates (e.g., Paramecium). However, Sporozoa do not possess cilia.

2. **Pseudopodia**: Pseudopodia, or "false feet," are extensions of the cell membrane and cytoplasm used for movement in organisms like Amoeba, which belong to the group Sarcodina. Sporozoans do not utilize pseudopodia for locomotion.

3. **Flagella**: Flagella are whip-like structures that enable movement in flagellates (e.g., Euglena). However, Sporozoa are characterized by the absence of flagella.

4. **None of the above**: This option suggests that Sporozoa do not have any of the locomotory structures listed above.

Upon reviewing the characteristics of Sporozoa, it is clear that they do not possess any locomotory structures. An example of a Sporozoan is Plasmodium, which is known for causing malaria and does not move using cilia, pseudopodia, or flagella.

Therefore, the correct answer to the question is **none of the above**.

### Step-by-Step Solution:
1. **Identify the locomotory structures**: Understand the types of locomotory structures mentioned - cilia, pseudopodia, flagella.
2. **Analyze each option**:
- Cilia: Present in ciliates, not in Sporozoa.
- Pseudopodia: Present in amoeboid organisms, not in Sporozoa.
- Flagella: Present in flagellates, not in Sporozoa.
3. **Evaluate the last option**: Since none of the above structures are present in Sporozoa, the answer must be "none of the above."
4. **Conclude**: The answer to the question is confirmed as "none of the above."