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Double fertilization involves :-

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Important Questions on Sexual Reproduction in Flowering Plants

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What would be the ploidy of the cells of tetrad?
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Choose the number of diploid structures in the list given below.

Pollen grains, nucellus, perisperm, endosperm, embryo sac, megaspore

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To some extent viability of pollen grains depends on:
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Which type of pollination is quite rare in flowering plants?
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Persistent endosperm in mature seed is found in :