Question

How does an earthworm fix parts of its body to the ground?

• A. By muscle contractions and expansions.
• B. With the help of the slimy substance secreted by its body.
• C. With the help of tiny bristles present under its body which project out.
• D. All of the above.

Answer 1

The correct option is C With the help of tiny bristles present under its body which project out.

a) Earthworms are classified under the phylum 'Annelida', which in Latin means 'little rings'. The earthworm is made of about 150-200 segments (little rings that all appear to be fused together). Each segment has muscles and bristles called setae. The tiny bristles or setae help the earthworm anchor/ fix to the soil firmly, while the other part of earthworm protrudes forward.

b) The muscular contractions and relaxations (expansions) help the earthworm in locomotion/ movement.

c) The slimy substance secreted by the earthworm is called mucus which helps the earthworm to keep moist, protect its skin and help in respiration by absorbing oxygen and expelling carbon dioxide.

So, the correct answer is 'With the help of tiny bristles present under its body which project out'.