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The first phase in the sexual reproduction of organisms is

A. spermatogenesis

B. oogenesis

C. spermiogenesis

D. gametogenesis

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  1. Mammalian placenta is
  2. Human egg is
  3. The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
  4. In the human female, the primary oocytes remain small without any growth for
  5. A freshly unfertilised egg of hen contains
  6. The cellular movements during gastrula-tion are called
  7. Cleidoic eggs are found in
  8. Oral contraceptives check
  9. In the growing oocyte, the nucleus enlarges in size due to an increase in
  10. The nervous system, epidermis and hairs and nails are derivatives of
  11. Grey cresent is present in
  12. Oogonia entering the growth phase of oogenesis is called
  13. For fertilization of the frog's egg
  14. Laternal line system of sense organs present in the skin of tadpole larva
  15. In forg, the sperms released from the testis take the following route to reach the ureter:
  16. Which of the following do not show parental care over their young ones ?
  17. During normal development the activation of the egg is achieved by
  18. How many cleavages are completed in 16 cell stages of frog's egg ?
  19. Metamorphosis is a characteristic feature of
  20. In frog's egg the divisoin is
  21. During metamorphosis, the disappearance of larval organs is called
  22. Which of the following does not show metamorphosis ?
  23. The sexual embrage of the male and female frogs is called
  24. In frog, gastrulation is completed by
  25. The allantoic vesicle arises from
  26. If an unfertilized frog's egg is pricked with a micro-needle, it will
  27. The intestine of tadpole is
  28. The substance fertilizin is secreted by
  29. Antifertilizin is secreted by
  30. Which one has the capacity to reproduce without fertilization of eggs ?