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Embryo sacs of some apomictic species ap...

Embryo sacs of some apomictic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.

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It is true that many apomicts possess normal looking embryo sacs. The only possibility of the embryo sac possessing diploid cells is due to failure of meiotic division at the megaspore mother cell stage. Since the megaspore mother cell has a diploid nucleus, if it undergoes mitosis instead of meiosis all the resulting nuclei and cells will be diploid in nature.
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
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  2. Mention any two sexually transmitted diseases in human and its causiti...

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

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

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

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

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

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

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

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

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  11. Give examples for physical and surgical contraceptive methods.

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

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

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  14. Describe the structure of blastula.

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  15. Mention the fate of all the components of the embryo sac after fertili...

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  16. (a) Draw a diagrammatic sectional view of a mature anatropous ovule an...

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  17. (a) Draw a diagrammatic sectional view of the female reproductive syst...

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  18. Mention examples for: a. Insect pollinated flower. b. Wind pollina...

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  19. Mention two types of gametogenesis.

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  20. (a) Draw a diagram of a mature embryo sac of an angiosperm and label t...

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