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    Question

    What event is unique to angiosperms and involves the

    fusion of two different male gametes?
    A Double fertilization Correct Answer Incorrect Answer
    B Triple fertilization Correct Answer Incorrect Answer
    C Self-pollination Correct Answer Incorrect Answer
    D Cleistogamy Correct Answer Incorrect Answer

    Solution

    One of the male gametes fuses with the egg cell (syngamy) to form a zygote and the other gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus (PEN). This event is termed as double fertilization and its unique to angiosperms.

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