Which of the following is not a feature of male Ascaris?

Options

A. Presence of single testis
B. Cloaca
C. Excretory pore at the anterior part
D. Anus

Answer

To determine which of the following is not a feature of male Ascaris, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Features of Male Ascaris:**
- Male Ascaris, commonly known as roundworms, belong to the phylum Nematoda.
- They possess a single testis, which is responsible for producing male gametes.

2. **Evaluate the Presence of Cloaca:**
- Male Ascaris have a cloaca, which is a common opening for the excretory and reproductive systems.
- In males, the anus is replaced by the cloaca, which serves dual functions.

3. **Examine the Size and Tail Structure:**
- Male Ascaris are generally smaller than female Ascaris.
- They have a curved tail that features pre- and post-anal papillae, which are important for mating.

4. **Check for Excretory Pore Location:**
- The excretory pore in male Ascaris is located at the anterior part of the body, which is a characteristic feature.

5. **Assess the Presence of Anus:**
- In male Ascaris, the anus is not present as it is replaced by the cloaca. This is a key distinguishing feature of male Ascaris.

### Conclusion:
Based on the analysis, the option that states the presence of an anus is **not a feature of male Ascaris**. Therefore, the correct answer is option 4, which indicates the absence of an anus.

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