Question

Which of the following statements is incorrect?

• A. The muscles become shorter and thicker because of contraction.
• B. The movement and locomotion of all animals are exactly the same.
• C. The act of changing position by the entire body is locomotion.
• D. Muscles work in pairs.

Answer 1

The correct option is B The movement and locomotion of all animals are exactly the same.

$\bullet$ Muscles work in pairs. When a muscle contracts, it becomes shorter, stiffer, and thicker. It pulls a bone towards itself. To move the bone in the opposite direction, the other muscle contracts while the first muscle relaxes. So, two muscles work together to move a bone.

$\bullet$ The act of moving body parts is called movement, whereas locomotion is the feature that help in moving from one place to another entirely by the use of locomotory organs.