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Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSexual Reproduction in Flowering Plants3 Marks
Question
Describe the development of endosperm after double fertilization in an angiosperm. Why does endosperm development precedes that of zygote?
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Answer

Following fertilisation the PEN (primary endosperm nucleus) divides repeatedly to give rise to free nuclei, subsequent cell wall formation leading to formation of endosperm.
Cells of endosperm are filled with reserved food materials to be used for nutrition of the developing embryo/for providing food to the developing embryo.

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