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 determine how many statements from the given options are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I**: "All locomotions are movements but all movements are not locomotions."
- **Analysis**: This statement is correct. Locomotion refers specifically to movement from one place to another, while movement can include any change in position, even if it doesn’t involve changing location.
- **Conclusion**: Statement I is correct.

2. **Statement II**: "Cells of the human body can exhibit amoeboid, ciliary and muscular movements but not flagellar movement."
- **Analysis**: This statement is also correct. Human cells can exhibit amoeboid movement (like white blood cells), ciliary movement (in structures like the respiratory tract), and muscular movement (in muscle cells). However, flagellar movement is not present in human cells; it is typically found in certain protozoa.
- **Conclusion**: Statement II is correct.

3. **Statement III**: "About 20 - 30 percent of the body weight of a human adult is contributed by muscles."
- **Analysis**: This statement is incorrect. The muscle mass in an adult human typically accounts for about 40 - 50 percent of body weight, not 20 - 30 percent.
- **Conclusion**: Statement III is incorrect.

4. **Statement IV**: "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 are smooth muscles, not striated muscles. Striated muscles are typically associated with voluntary movements and are not found in the digestive tract.
- **Conclusion**: Statement IV is incorrect.

### Summary of Findings:
- **Correct Statements**: I and II
- **Incorrect Statements**: III and IV

### Final Answer:
There are **2 incorrect statements** (III and IV).