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Question
The endosperm in gymnosperms is:
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Solution
The correct option is A Haploid
In gymnosperms, inside the nucellus, one cell differentiated into megaspore mother cell. It undergoes reduction division (meiosis) to form a linear tetrad of four haploid megaspores. Usually, the upper 3 megaspores towards micropyle degenerate while the lowermost functional megaspore (embryo sac cell) undergoes free nuclear division followed by wall formation to form a cellular female gametophyte or endosperm. Hence, the endosperm in gymnosperms is haploid as it is formed before fertilisation, from a single megaspore.
In gymnosperms, inside the nucellus, one cell differentiated into megaspore mother cell. It undergoes reduction division (meiosis) to form a linear tetrad of four haploid megaspores. Usually, the upper 3 megaspores towards micropyle degenerate while the lowermost functional megaspore (embryo sac cell) undergoes free nuclear division followed by wall formation to form a cellular female gametophyte or endosperm. Hence, the endosperm in gymnosperms is haploid as it is formed before fertilisation, from a single megaspore.
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