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A mature female gametophyte (embryo sac/...

A mature female gametophyte (embryo sac/egg apparatus) of angiosperms is 7 celled with 8 nucleus . Name the individual cells and mention their count.

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`{:("(a) Egg ", -1),("(b) Secondary nucleus",-1),("(c) Synergids ",-2),("(d) Antipodalcells",-3):}`
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With a neat diagram explain the 7-celled , 8 nucleate nature of the female gametophyte .

Select the correct statements (s) regarding the structure of a mature embryo sac. (i) Egg apparatus is situated towards chalzal end. (ii) Antipodal cells are situated towards micropylar end. (iii) A typical angiospermic embryo sac is 7-celled, 8-nucleate at maturity

From the statements given below, choose the option that are true for a typical female gametophyte of a flowering plant. (i) It is 8-nucleate and 7-celled at maturity. (ii) It is free-nuclear during the development. (iii) It is situated inside the integument but outside the nucellus. (iv) It has an egg apparatus situated at the chalazal end.

Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei with the help of his teacher. (a) Name the other nuclei present in the embryo sac . (b) Help Raman by listing the changes that take place with egg nucleus and polar nuclei after fertilization .

An embryologist interested in studying the morphogenetic movements in chick embryo, during 3 cells layer stage of the embryo, added some vital stains as embryonic fate markers (embryonic fate markers usually stain the cells and in future development of embryo the stained cells differen tiate into developing organ. Thus the movement of the cell can be traced). He gave the upper layer green colour, middle layer orange and innermost layer blue. a. Name the 3 layers mentioned above. b. Based on your knowledge regarding the development of an embryo predict three organs with these respective colours.

(A) Draw the embryo sac of a flowering plant and label (i) central cell (ii) chalazal end of the embryo sac and (iii ) synergids. (b) Name the cell that develops into the embryo sac and explain how this cell leads to the formation of embryo sac. Also mention the role played by the various cells of the embryo sac .

Consider the following statements. (i) Polyspermy may bring about fertilisation of egg by more than one male nucleus or the supernumerary sperms may fertilise other components of embryo sac much as synergids or antipodals. (ii) In angiosperms, pollen tube is normally an unbranched structure which ususally persists after fertilisation. (iii) Intine is the inner, pectocellulosic layer of pollen grain wall which is destroyed during acetolysis. (iv) Exine layer of pollen grain comprises of an outer non-sculptured layer sexine and an inner sculptured layer tectum. Which of the following combinations of above given statements is correct ?

How many cells are found in an angiosperm embryo sac? Name them.

An embryo may sometimes develop from any cell of embryo sac other than egg.It is termed as

FULL MARKS-ASEXUAL AND SEXUAL REPRODUCTION IN PLANTS-Additional Questions (3- Mark Questios)
  1. Draw and label the structure of a mature embryo sac of angiosperms.

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  2. How many synergid cells are there in an mature embryo sac . Mention an...

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  3. A mature female gametophyte (embryo sac/egg apparatus) of angiosperms ...

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  4. Differentiate between chasmogamy and cleistogamy.

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  5. Geitonogamy is similar to autogamy . Justify the statement .

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  6. Explain the Herkogamy mechanism with suitable examples

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  7. Given a brief account on pollination process in Zea mays.

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  8. Explain the role of water as a pollinating agent in Vallisneria spiral...

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  9. Enumerate the characters of ornithophilous flowers.

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  10. How the flowers of salvia are adoped for mellitophily?

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  11. Write down the advantages and disadvantages of cross-pollination.

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  12. Why pollination has to occur ?

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  13. How the pollen germination and compatibility is regulated by stigma of...

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  14. Give a brief account on solid style.

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  15. Exaplain the types of entry of pollen tube into the ovule.

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  16. What is the fate of pollen tube after reaching the embryo sac?

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  17. What is triple fusion ?

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  18. Write a short note on endosperm.

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  19. How nuclear endosperm is different from cellular endosperm

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  20. Give an account on Helobial endosperm.

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