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