Question

Locomotion occurs in Earthworm with the help of
 (a)Setae
 (b)Setae and circular muscles
 (c)Parapodia
 (d)Setae, circular muscles, and longitudinal muscles

Answer 1

Hint: They are the bristles-like structure in the dorsal side of its body. It helps them in attaching their body to the ground and lessens their body when they move and helps them move in various motions.

Complete answer:
-The locomotion in earthworm occurs due to the presence of the brush or bristle-like structures called Seta.
-Along with Setae they use different longitudinal and circular muscles for their movement.
-It helps their body to contract and then move forward.
-These setae are present along with the whole body surface of the earthworm.
-The movement of earthworms includes contraction and relaxation, thus their motion is known as peristalsis.

Additional Information: -Earthworm belongs to the phylum Annelida.
- They are triploblastic and have bilateral symmetry animals.
-Metameric segmentation is observed where the body is segmented, from head to tail.
-The circulatory system of an earthworm is closed.
-They are referred to as segmented worms.
-The coelom is the true body cavity they possess. Breathing takes place through the skin.
-Earthworms are hermaphrodites having both male and female reproductive systems in one individual.
-They have organs called nephridia for excretion.
-Their nervous system consists of paired ganglia (collections of nerve cell bodies) and a double ventral nerve cord connected by lateral nerves.
So, the correct answer is ‘Setae, circular muscles, and longitudinal muscles’.

Note: Earthworms are advantageous in the process of the formation of vermicompost. Vermicompost (vermicompost) is the result of the decomposition process to produce a mixture of decomposing vegetable or food waste, bedding materials, and vermicast using different species of worms, usually red wigglers, white worms, and other earthworms. This method is called vermicomposting, while vermiculture is called the rearing of worms for this reason.