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Q.
Which of the following condition of angiospermic embryo sac is seen at maturity?
UP CPMTUP CPMT 2010Sexual Reproduction in Flowering Plants
Solution:
In angiosperms, the female gametophyte or embryo sac is an oval multicellular haploid structure which is embedded in the nucellus towards micropylar half of the ovule. It contains 8 nuclei but 7 cells -3 micropylar, 3 chalazal and one central. It is formed by one meiosis and three mitosis. All the cells of the embryo sac are haploid except the central cell which is first binucleate and then becomes diploid due to fusion of polar nuclei.