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  4. Several pollen grains form a unit designated as pollinium in Family

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Q. Several pollen grains form a unit designated as pollinium in Family

Sexual Reproduction in Flowering Plants

Solution:

In Calotropis and related plants of Family Asdepiadaceae, all the pollen grains of an anther lobe remain united in a single sac called pollinium.Two pollinia of adjacent anthers are attached to produce a translator.