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(a) Draw a diagram of a mature embryo sa...

(a) Draw a diagram of a mature embryo sac of an angiosperm and label the following parts in it :
(i) Filiform apparatus (ii) Synergids
(iii) Central cell (iv) Egg cell
(v) Polar nuclei (vi) Antipodals
(b) Write the fate of egg cell and polar nuclei after fertilization.

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(a)
(b)On fertilization, egg cell forms zygote which further develops into an embryo while polar nuclei after being fertilised develop into primary endosperm nucleus by the process of triple fusion. This then gives rise to a nutritive triploid endosperm tissue .
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TRUEMAN BIOLOGY-REPRODUCTION-SECTION-D
  1. Define Oogenesis. When and where in the body is oogenesis completed?

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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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