What is meant by a nucellus in gymnosperms?please Explain.

Nucellus ‚Äč(megasporangium) is the central part of ovule, enclosed within integuments in the seed producing plants ( gymnosperms and angiosperms). Its one of the cell ( diploid cell) act as megaspore mother cell to form megaspores through meiosis. Functional megapore form female gametophyte ( embryo sac)  inside nucellus. 

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