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In earthworm, the first segment in which mouth is situated is known as

A. prostomium

B. peristomium

C. stomium

D. protostomium

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  1. The chloragogen cells of earthworm are analogous to
  2. Metamerism is present in
  3. Role of typhlosole in the intestine of earthworm is
  4. In earthworm, the genital papillae are situated ventrally on segments
  5. A chitinous lining in earthworm is found in
  6. In earthworm, the circular muscles are highly developed in
  7. Anticoagulant secreted by leech is
  8. The septal and pharyngeal nephridia open into the alimentary canal and are of enteronephric type. It…
  9. Copulation occurs between two earthworms
  10. The terminal nephridial ducts of the septal nephridia of Pheretima open into
  11. The female genital aperture in earthworm is present ventrally on segment
  12. Spermathecae in earthworm represent
  13. The nitrogenous waste in earthworm consist of about
  14. Blood glands in Earthworm are associated with
  15. The number of segments in leech is
  16. In earthworm fertilisation occurs in
  17. Earthworms do not have any respiratory organs because
  18. In the blood vascular system of earthworm there are four pairs of hearts present in the first 13 segments.…
  19. Totally marine annelids belong to the
  20. The cliteilum singulum in earthworm is formed by
  21. In earthworm, the nephridia without neprostomes are
  22. Structure typically represented in every segment of earthworm is
  23. Sperma thecae in earthworm are meant few
  24. 5. The pre-typhlosolar region in Pheretima extends from
  25. Earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic…
  26. A skeleton like function during locomotion of Pheretima is performed by
  27. The fertilization in earthworms occurs in
  28. Which region in earthworm is the forest of nephridia ?
  29. Chromophil cells in earthworm are concerned with the secretion of
  30. Chetae are totally absent in