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Double Fertilisation

How many diff...

Question

How many different types of cells or nuclei of the embryosac in Capsella are fertilized by a single discharge of the tube?

A

One (egg only)

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B

Two (egg + secondary nucleus)

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C

Three (egg + polar nuclei + antipodals)

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D

Five (polar nuclei + antipodals)

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Solution

The correct option is A Two (egg + secondary nucleus)
Capsella is an angiosperm, where the ovule has egg cell, haploid as well as diploid and secondary polar nucleus. In the angiosperms, double fertilization occurs, where the egg cell fuses with the male gamete and the secondary polar nuclei fuses with another male nucleus to form triploid endosperm.

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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 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. 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

The ploidy of (i) male gamete, (ii) zygote, (iii) egg cell, (iv) polar nuclei and (v) PEN is

Meaning of-

Double fertilisation

Polar nuclei

Synergids

Antipodal cells

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