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Question

What is an earthworm?


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Solution

Earthworm:

  1. The earthworm (Lumbricus terrestris) is a reddish-brown terrestrial invertebrate belonging to the phylum Annelida that lives in the moist soil.
  2. The body of an earthworm is streamlined, with no antennae, fins, arms, or legs.
  3. Each earthworm's body segment is surrounded by circular muscles.
  4. The coelom is the body cavity.
  5. They have a closed circulatory system.
  6. A primitive brain made of fused ganglia, a ventral nerve cord, and peripheral nerves make up an earthworm's nervous system.
  7. The digestive system is complete.
  8. Earthworms are hermaphrodite organisms.
  9. Nephridia, which are found in earthworms, are crucial for osmoregulation and the excretion of nitrogenous waste.
  10. Worm castings are the fecal deposits of earthworms.
  11. Reproduction is sexual in earthworms.


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