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Earthworms do not have any respiratory organs because

A. they do not need them

B. they are burrowing in habit

C. there is no sufficient space for such organs

D. the surface acts as an absorptive area which is larger than the volume

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  1. Nephrostomes are found in
  2. The septal and pharyngeal nephridia open into the alimentary canal and are of enteronephric type. It…
  3. Totally marine annelids belong to the
  4. The excretory organs of earthworm are
  5. The female genital aperture in earthworm is present ventrally on segment
  6. Anticoagulant secreted by leech is
  7. Locomotion in Earthworm is directly facilitated by
  8. Role of typhlosole in the intestine of earthworm is
  9. Copulation occurs between two earthworms
  10. 5. The pre-typhlosolar region in Pheretima extends from
  11. The fertilization in earthworms occurs in
  12. The dorsal blood vessel in earthworm is
  13. Sperma thecae in earthworm are meant few
  14. Chromophil cells in earthworm are concerned with the secretion of
  15. Annelids show advancement over the nematoda in having
  16. Earthworm is useful because it
  17. The gizzard of earthworm is an organ of
  18. Structure typically represented in every segment of earthworm is
  19. Metamerism is present in
  20. Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic…
  21. In earthworm, the first segment in which mouth is situated is known as
  22. A chitinous lining in earthworm is found in
  23. In earthworm, the genital papillae are situated ventrally on segments
  24. The terminal nephridial ducts of the septal nephridia of Pheretima open into
  25. Nereis is commonly called
  26. The cliteilum singulum in earthworm is formed by
  27. Which of the following statements is correct ?
  28. The direction of blood flow in the dorsal vessel of earthworm is
  29. In earthworm fertilisation occurs in
  30. The chloragogen cells of earthworm are analogous to