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Question

What is the correct sequence of the formation of female gametophyte in angiosperms?


A

Nucellus, megaspore tetrad, megaspore mother cell, megaspore, female gametophyte

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B

Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte

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C

Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte

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D

Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametohyte

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Solution

The correct option is C

Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte


In angiosperms, the body of the ovule consists of a mass of parenchymatous cells called nucellus. In the hypodermal region of nucellus towards the micropylar end develops a primary archesporial cell, which by further divisions forms a diploid megaspore mother cell. The latter undergoes meiosis to form megaspore tetrad. Usually, the chalazal megaspore remains functional while the other three degenerate. The functional megaspore is the first cell of female gametophyte (embryo sac).


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