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Question
A typical angiosperm embryo sac at maturity is:
A typical angiosperm embryo sac at maturity is:
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Solution
The correct option is B 8 - nucleate and 7 - celled
The embryo sac in angiosperms is the megagametophyte.
There is a characteristic distribution of the cells within the embryo sac.
A group of three cells at the micropylar end constitute the egg apparatus which, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which guide the pollen tubes into the synergid.
A group of three cells at the chalazal end are called the antipodals.
A large central cell, at the centre, contains two polar nuclei.
Thus, a typical angiosperm embryo sac, at maturity, is 8-nucleate and 7-celled.
The embryo sac in angiosperms is the megagametophyte.
There is a characteristic distribution of the cells within the embryo sac.
A group of three cells at the micropylar end constitute the egg apparatus which, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which guide the pollen tubes into the synergid.
A group of three cells at the chalazal end are called the antipodals.
A large central cell, at the centre, contains two polar nuclei.
Thus, a typical angiosperm embryo sac, at maturity, is 8-nucleate and 7-celled.
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