Read the following statements carefully :
I. All locomotions are movements but all movements are not locomotions.
II. Cells of the human body can exhibit amoeboid, ciliary and
muscular movements but not flagellar movement.
III. About 20 - 30 per cent of the body weight of a human adult is contributed by muscles.
IV. Striated visceral muscles are involved in the transportation
of food through the digestive tract and gametes through the genital tract.
How many statements from the above are incorrect ?

Options

A. Three
B. Four
C. Two
D. One

Answer

To solve the question, we need to evaluate each of the four statements provided and determine how many of them are incorrect.

### Step-by-Step Solution:

1. **Evaluate Statement I:**
- **Statement:** "All locomotions are movements but all movements are not locomotions."
- **Analysis:** This statement is true. Locomotion is a specific type of movement that involves the displacement of an organism from one place to another. Therefore, this statement is correct.

2. **Evaluate Statement II:**
- **Statement:** "Cells of the human body can exhibit amoeboid, ciliary and muscular movements but not flagellar movement."
- **Analysis:** This statement is also true. Human cells can exhibit amoeboid movement (e.g., white blood cells), ciliary movement (e.g., cells in the respiratory tract), and muscular movement. However, flagellar movement is not present in human cells. Thus, this statement is correct.

3. **Evaluate Statement III:**
- **Statement:** "About 20 - 30 percent of the body weight of a human adult is contributed by muscles."
- **Analysis:** This statement is incorrect. The actual percentage of body weight contributed by muscles in a human adult is approximately 40 - 50%. Therefore, this statement is incorrect.

4. **Evaluate Statement IV:**
- **Statement:** "Striated visceral muscles are involved in the transportation of food through the digestive tract and gametes through the genital tract."
- **Analysis:** This statement is incorrect. The muscles involved in the transportation of food through the digestive tract and gametes through the genital tract are smooth muscles, not striated visceral muscles. Thus, this statement is also incorrect.

### Conclusion:
- **Correct Statements:** 1 (Statement I) and 2 (Statement II)
- **Incorrect Statements:** 3 (Statement III) and 4 (Statement IV)

### Final Count of Incorrect Statements:
- There are **2 incorrect statements** (Statements III and IV).

### Answer:
The number of incorrect statements is **2**.

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