EVERYDAY SCIENCE

Detailed explanation-1: -The main function of setae is locomotion. Each seta lies in a setal sac, which is a small pit in the skin. The sac has special muscles to move the seta out or in and to bend it forward or backward. It holds the ground firmly so that the other parts of the body move in the forward and backward direction.

Detailed explanation-2: -An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. The earthworm can push the setae out of its body to grab the soil around it. To move forward, the worm uses its setae to anchor the front of its body and contracts the longitudinal muscles to shorten its body.

Detailed explanation-3: -An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. Starfish carry out movements with the help of tube feet that are part of the water vascular system.

Detailed explanation-4: -Setae of earthworm helps in locomotion.