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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. When and where in the body is oogenesis completed?

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  2. (a) How is the placenta connected to the embryo? (b ) Placenta acts ...

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

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  4. 2 difference between cross pollination and self pollination

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  5. Draw a labelled diagram of the structure of mature dicot embryo.

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

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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 apomitic species appear normal but contain diploid...

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  10. Meiotic division during oogenesis is different from that in spermatoge...

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  11. Enumerate and describe any five reasons for introducing sex education ...

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

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  13. Describe the stage in embryo development in a dicot plant.

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  14. Where is morula formed in humans? Explain the process of its developme...

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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. (a) Draw a labelled schematic diagram of the transverse section of a m...

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  19. Write two differences between spermtogenesis and oogenesis

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

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