In earthworm, the genital papillae are situated ventrally on segments

A. 17

B. 18

C. 19 and 22

D. 17 and 19

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  1. In earthworm testes are situated in the
  2. The coelomic fluid in earthworm escapes through
  3. Earthworm is useful because it
  4. In earthworm fertilisation occurs in
  5. Nereis is commonly called
  6. Sperma thecae in earthworm are meant few
  7. 5. The pre-typhlosolar region in Pheretima extends from
  8. Pheretima is
  9. The septal and pharyngeal nephridia open into the alimentary canal and are of enteronephric type. It…
  10. The gizzard of earthworm is an organ of
  11. The enteronephric nephridia in earthworm are
  12. Structure typically represented in every segment of earthworm is
  13. Annelids show advancement over the nematoda in having
  14. Blood glands in Earthworm are associated with
  15. Spermathecae in earthworm represent
  16. Anticoagulant secreted by leech is
  17. The terminal nephridial ducts of the septal nephridia of Pheretima open into
  18. Chetae are totally absent in
  19. In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments.…
  20. Which region in earthworm is the forest of nephridia ?
  21. The cliteilum singulum in earthworm is formed by
  22. The direction of blood flow in the dorsal vessel of earthworm is
  23. Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic…
  24. Earthworms do not have any respiratory organs because
  25. Locomotion in Earthworm is directly facilitated by
  26. The nitrogenous waste in earthworm consist of about
  27. Totally marine annelids belong to the
  28. A chitinous lining in earthworm is found in
  29. In earthworm, the septal nephridia put their excretory discharge into
  30. The female genital aperture in earthworm is present ventrally on segment