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 ?