Which type of muscles help in the locomotion of annelids?

Longitudinal muscles

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Circular muscles

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Oblique muscles

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All the above

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Solution

The correct options are
A Longitudinal muscles
B Circular muscles
Annelids possess longitudinal and circular muscles which help in their locomotion. When the circular muscles are contracted, the diameter of the body is reduced, making the worm thin. When the longitudinal muscles are contracted, the length of the body is reduced, making the worm short. This results in peristaltic movement (wave-like movement).

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The body of an organism 'X' consists of two types of muscle and has chaetae for locomotion. Which is the organism 'X'?

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