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. The coelomic fluid in earthworm escapes through
  2. Which of the following statements is correct ?
  3. Earthworms do not have any respiratory organs because
  4. Role of typhlosole in the intestine of earthworm is
  5. Locomotion in Earthworm is directly facilitated by
  6. Which region in earthworm is the forest of nephridia ?
  7. The cliteilum singulum in earthworm is formed by
  8. The dorsal blood vessel in earthworm is
  9. In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments.…
  10. Totally marine annelids belong to the
  11. Haemoglobin is dissolved in plasma is
  12. The excretory organs of earthworm are
  13. In earthworm testes are situated in the
  14. Pheretima is
  15. Chloragogen cells of Pheretima play a role very much like that of
  16. Metamerism is present in
  17. Sperma thecae in earthworm are meant few
  18. Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic…
  19. Spermathecae in earthworm represent
  20. Structure typically represented in every segment of earthworm is
  21. The number of segments in leech is
  22. The direction of blood flow in the dorsal vessel of earthworm is
  23. Chromophil cells in earthworm are concerned with the secretion of
  24. The gizzard of earthworm is an organ of
  25. The septal and pharyngeal nephridia open into the alimentary canal and are of enteronephric type. It…
  26. Earthworm is useful because it
  27. The terminal nephridial ducts of the septal nephridia of Pheretima open into
  28. Annelids show advancement over the nematoda in having
  29. A chitinous lining in earthworm is found in
  30. Nephrostomes are found in