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Double Fertilisation

[A]: Embryosa...

Question

[A]: Embryosac of angiosperms is usually 7-celled and 8-nucleated
[R]: Binucleate cell of embryosac has double layered cell wall

A

Both A and R are true and R is the correct explanation of A

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B

Both A and R are true but R is not the correct explanation of A

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C

A is true but R is false

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D

A and R are false

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Solution

The correct option is C A is true but R is false
Binucleate cell of embryosac has single layered cell wall

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Q. The number of free nuclear mitotic divisions that occur during the formation of

7 - c e l l e d, 8 - n u c l e a t e d

$ embryosac from a single functional megaspore __________________.

Q. [A]: Embryosac has both dikaryotic cell and monokaryotic cells
[R]: Only dikaryotic cell is involved in fertilization in an embryosac.

Q. Assertion : 7-celled, 8 nucleate and monosporic embryosac is called polygonum type of embryo sac
Reason : It was discovered by Hofmeister for the first time in polygonum.

Q. Assertion: A typical angiosperm embryo sac is 8-nucleate and 7-celled.
Reason: The large central cell of embryo sac has three polar nuclei.

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?

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