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Structure of Ovule

Reeja a scien...

Question

Reeja a science student observed the structure of mature embryosac comprising antipodals, central cells and egg apparatus. Explain each one of them.

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Solution

Egg apparatus are the three cells located at the micropylar end of the embryo sac in angiosperms. It consists of the egg cell and surrounded by two sterile cells called synergids. Antipodal cells are haploid cells present at the chalazal end of the embryo sac.

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Q. Select the correct statements regarding the structure of a mature embryo sac.

a) Egg apparatus consists one egg cell and two synergids.
(b) Antipodals cells are situated towards micropylar end.
(c) Polygonum type of embryo sac is most common type in angiosperms.
(d) Polar nuclei are situated below the egg apparatus in the larger central cell.

Q. In a 7 celled and 8 nucleated embryosac :
(a) The polar nuclei are situated below the egg apparatus in central cell
(b) Egg apparatus has two synergids and one egg cell at micropylar end
(c) Filiform apparatus in synergids direct the pollen tube to enter into egg cell
(d) Antipodal cells are haploid but have different genetic composition to that of egg cell
How many above statements are true for statement given in the question?

Q. Select the correct statement(s) regarding the structure of a mature embryo sac.
(i) Egg apparatus is situated towards chalazal end.
(ii) Antipodal cells are situated towards micropylar end.
(iii) a typical angiospermic embryo sac is

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nucleate at maturity.

Q. The number of synergids and antipodals present in a typical angiosperm embryosac at maturity respectively are

Q. Identify the correct pair of statements.
(I) The filiform apparatus helps in absorption of food.
(II) Antipodals are the vegetative cells of female gametophyte.
(III) The fusion of two polar nuclei and male gamete occurs always before the entry of pollen tube.
(IV) The largest cell of embryosac is the egg cell.
The correct pair is

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