Lips of Ascaris are

Options

A. Smooth
B. Rough
C. Denticulate
D. Spiny

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The organism in question is Ascaris, which is commonly known as a roundworm.

2. **Understand the Habitat**: Ascaris is a parasitic organism that primarily inhabits the intestines of its host, causing various diseases.

3. **Examine the Morphology**: The mouth of Ascaris is located at the anterior (front) end of its body.

4. **Describe the Lips**: The mouth of Ascaris features three types of lips:
- One dorsal lip (located on the upper side)
- Two ventral lips (located on the lower side)

5. **Analyze the Structure of the Lips**: The lips of Ascaris are not smooth; instead, they possess numerous small, tooth-like structures.

6. **Determine the Correct Description**: Given the presence of these tooth-like structures, the lips of Ascaris can be described as "denticulate."

7. **Evaluate the Options**:
- Option 1: Smooth - Incorrect (teeth are present)
- Option 2: Rough - Incorrect (not the best description)
- Option 3: Denticulate - Correct (due to the presence of teeth-like structures)
- Option 4: Spine - Incorrect (spines are not present)

8. **Conclude the Answer**: The correct answer is that the lips of Ascaris are "denticulate."