Read the following statements (I to IV).
I. Snail moves with the help of its muscular foot.
II. Vertebral column of man has more number of vertebrae than that of woman.
III. At the time of birth, a human baby has more number of bones than an adult.
IV. Joint present in the upper jaw of the skull is freely movable.
Which of the above statements are incorrect?

Options

A. I and II
B. I and III
C. II and III
D. II and IV

Explanation

To determine which statements are incorrect, let's analyze each statement one by one:

### Step 1: Analyze Statement I
**Statement I:** Snail moves with the help of its muscular foot.
- This statement is **correct**. Snails use their muscular foot to create a gliding motion on surfaces.

### Step 2: Analyze Statement II
**Statement II:** Vertebral column of man has more number of vertebrae than that of woman.
- This statement is **incorrect**. Both men and women have the same number of vertebrae in their vertebral column, which is typically 33.

### Step 3: Analyze Statement III
**Statement III:** At the time of birth, a human baby has more number of bones than an adult.
- This statement is **correct**. A human baby is born with approximately 300 bones, but as they grow, some of these bones fuse together, resulting in 206 bones in an adult.

### Step 4: Analyze Statement IV
**Statement IV:** Joint present in the upper jaw of the skull is freely movable.
- This statement is **incorrect**. The upper jaw (maxilla) is fixed and does not move; only the lower jaw (mandible) is movable.

### Conclusion
The incorrect statements are:
- Statement II: "Vertebral column of man has more number of vertebrae than that of woman."
- Statement IV: "Joint present in the upper jaw of the skull is freely movable."

### Final Answer
The incorrect statements are **II and IV**.

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