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Mention two events that are inhibited by...

Mention two events that are inhibited by the intake of oral contraceptive pills to prevent pregnancy in humans.

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The oral pills inhibit the secretion of FSH and LH that prevent ovulation They also prevent implantation and alter the quality of cervical mucus to prevent or retard entry of sperms .
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
  1. Mention two events that are inhibited by the intake of oral contracept...

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  2. Mention the region in female reproductive system in which fertilizatio...

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  3. "Incompatibility is a natural barrier in the fusion of gametes". Justi...

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  4. Show diagrammatically the stages of embryonic development from zygote ...

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  5. Describe the head region in human sperm.

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  6. (a) At which stage of life does gametogenesis begin in human male and ...

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  7. Mention the ploidy of the following: a) Megaspore mother cell. b) ...

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  8. Study the flow chart given below . Name the hormones involved at each ...

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  9. Define Oogenesis. When and where in the body is oogenesis completed?

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  10. Mention any two sexually transmitted diseases in human and its causiti...

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  11. Give reasons why: (i) Most zygotes in angiosperms divide only afte...

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  12. Describe in sequence the events that lead to the development of a 3-ce...

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  13. (a ) Trace the development ofmegaspore mother cell up to the formation...

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  14. (a ) Draw a labelled longisectional view of an albuminous 'seed'· (b...

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  15. Describe the post-zygotic events leading to implantation and placenta ...

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  16. Although sexual reproduction is a long drawn, energy-intensive complex...

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  17. Embryo sacs of some apomictic species appear normal but contain diploi...

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  18. Describe oestrous cycle. In which group of animals is it observed.

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  19. Give examples for physical and surgical contraceptive methods.

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  20. The following is the illustration of the sequence of ovarian events (a...

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  21. Mention the function of Synergids and polar nuclei in embryo sac.

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