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  4. In Pinus the endosperm is:

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Q. In Pinus the endosperm is:

ManipalManipal 2003

Solution:

Endosperm in Pinus (gymnosperm) is formed before fertilization haploid. The embryosac (i.e., haploid) in gymnosperms, is formed by the reductional division from megaspore mother cell. The functional megaspore enlarges and its nuclei divides repeatedly to form free nuclei. Later wall formation occurs from periphery towards centre. This forms cellular mass of gametophytic tissue known as endosperm.