Question

Dorsal surface of earthworm is recognised by (1)Genital apertures (2)Setae (3)Dark mid-dorsal line(4)Cuticle

Answer 1

Dorsal surface of earthworm is recognised by Dark mid-dorsal line.

Option (3)

Explanation:

• Earthworms are called as Farmer's friends as they help in the soil enrichment.
• Earthworm belongs to the phylum Annelida.
• It is found mostly in the soil and get its feed from live/dead organic matter.
• Earthworm has long, segmented body.
• The non-cellular layer (cuticle) covers the entire body of the worm.
• The dorsal portion of the earthworm is rounded in shape.
• The ventral portion is flat in shape.
• The dorsal portion is darker than the ventral portion.
• The dark mid dorsal lines are the feature of the dorsal portion.
• They are the blood vessels that are present under the skin.

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