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Fetus Development

Refer to the ...

Question

Refer to the given figure of egg apparatus showing entry of pollen tube into a synergid. Identify any two of the labelled parts and select the correct option.

A

A-Central cell, G-Egg nucleus

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B

C-Plamsa membrane, D-Vegetative nucleus

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C

B-Egg nucleus, F-Male gametes

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D

B-Central cell, E-Filiform apparatus

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Solution

The correct option is B B-Egg nucleus, F-Male gametes
In the given figure A-central cell, B-egg nucleus, C-plasma membrane, D-synergid, E-filiform apparatus, F-male gametes, G-vegetative nucleus.

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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. 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.
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Q. Which of the following statements is/are incorrect?
Statement 1: Fusion of egg with male gamete is called apogamy and the resultant structure is haploid
Statement 2: Primary endosperm nucleus (PEN) is a diploid structure
Statement 3: Synergids are haploid
Statement 4: Synergids bears filiform apparatus

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. Fusion of one of the male gametes with egg nucleus, referred to as?

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