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  4. In a flowering plant, megaspore develops into an embryo sac, which contains

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Q. In a flowering plant, megaspore develops into an embryo sac, which contains

AMUAMU 2005

Solution:

The female gametophyte, also called embryo sac is mostly a $7$-celled structure. There is a large centeral cell with two polar nuclei, which later fuse to form secondary nucleus. The micropylar end of the central cell is occupied by the egg apparatus comprising an egg cell and $2$ synergids and at chalazal end three antipodal cells are present, cells of the egg apparatus and the antipodal cells are uninucleate and haploid where as the central cell is binucleate or diploid.