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Megasporogenesis

why cell wall...

Question

why cell wall formation is at 8-celled stage in embryo sac ?

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Solution

It is so because repeated divisions take place while formation of embryo sac. As it starts developing, it develops into a 7 celled and 8 nucleated structure.

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Q. Assertion: In angiosperms, each of the cells of an embryo-sac is haploid.
Reason: Embryo sac formation is preceded by meiosis.

Q. Assertion :In angiosperms, each cell of the embryo sac is haploid. Reason: In angiosperms, embryo sac formation is preceded by meiosis.

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. Choose the correct statement(s).
Statement 1: In a mature embryo sac, egg apparatus is situated towards the chalazal end.
Statement 2: In a mature embryo sac, antipodal cells are situated towards the micropylar end.
Statement 3: An angiosperm embryo sac is 7-celled 8-nucleate at maturity.

Q. Trace the development of megaspore mother cell upto the formation of a mature embryo sac in a flowering plant.

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