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Blastopore in frogs development occurs in

A. blastula and opens in blastocoel

B. blastula and opens in archenteron

C. gastrula and opens in blastocoel

D. gastrula and opens in archenteron

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  1. During metamorphosis, the disappearance of larval organs is called
  2. A freshly unfertilised egg of hen contains
  3. Cleidoic eggs are found in
  4. Which of the following does not show metamorphosis ?
  5. Sexual reproduction in larval condition is known as
  6. Laternal line system of sense organs present in the skin of tadpole larva
  7. The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
  8. In the human female, the primary oocytes remain small without any growth for
  9. The formation, development and matura- j tion of the female gamete is called
  10. Metamorphosis is a characteristic feature of
  11. Human egg is
  12. Which of the following do not show parental care over their young ones ?
  13. During the development of frog, the ar-chenteron is formed in
  14. The nervous system, epidermis and hairs and nails are derivatives of
  15. In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process…
  16. Oral contraceptives check
  17. In forg, the sperms released from the testis take the following route to reach the ureter:
  18. The intestine of tadpole is
  19. For fertilization of the frog's egg
  20. Grey cresent is present in
  21. Blastopore in frogs development occurs in
  22. The formation of the neural tube is known as
  23. If an unfertilized frog's egg is pricked with a micro-needle, it will
  24. The substance fertilizin is secreted by
  25. Oogonia entering the growth phase of oogenesis is called
  26. In the growing oocyte, the nucleus enlarges in size due to an increase in
  27. How many cleavages are completed in 16 cell stages of frog's egg ?
  28. The first phase in the sexual reproduction of organisms is
  29. During fertilization the spermatozoa penetrate through the egg membranes with the help of
  30. Development of egg without fertilization is termed as