46 | 198. Following are the statements about prostomium of earthworm. (a) It serves as a covering for mouth. (b) It helps to open cracks in the soil into which it can crawl. (c) It is one of the sensory structures. (d) It is the first body segment. options oiven
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The wrong option among the given options is option d.
The first body segment is not prostomium ,it is peristomium (buccal segment) which contains the mouth.
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Out of the given statements about prostomium of an earthworm, Options a, b, and c holds true whereas OPTION D is incorrect.
EARTHWORM
- Earthworm belongs to the phylum Annelida of Animalia Kingdom.
- The Segmented body is the notable feature of the earthworms.
- The First segment is known as the peristomium that surrounds the mouth opening.
- The prostomium is present in the anterior part or head and overhangs covering the mouth opening.
- Earthworm lacks sensory organs such as eyes nose, ears and so have prostomium as a sensory structure.
- Prostomium plays an important role in pushing the organism into the soil.
- Prostomium works as a wedge and helps in digging burrows.
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