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Why an anther with malfunctioning tapetu...

Why an anther with malfunctioning tapetum often fails to produce vaiable male gametophytes?

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Tapetum plays an important role as it provides nourishment to the developing pollen grains or male gametophytes
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Assertion. A pollen grain of angiosperm is considered as the male gametophyte . Reason. All the nuclei of the pollen grain produce male gametes.

A bilobed, dithecous anther has 100 microspore mother cells per microsporangium. How many male gametophytes this anther can produce ?

In certain simple plants, why are male gametes produced in large numbers as compared to the female gametes? It is applicable in animals also? Yes or not.

Male gametophyte in angiosperms produces:

Male gametophyte in angiosperms produces:

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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
  1. Why an anther with malfunctioning tapetum often fails to produce vaiab...

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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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