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When all pollen grains of a sporangium a...

When all pollen grains of a sporangium are united together, this structure is known as

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Assertion : In most angiosperms, microspores of a tetrad grow and separate from one another shortly after meiosis. Reason : In the members of families Orchidaceae and Asclepiadaceae, all the pollen grains of a sporangium remain united to form a compact structure called pollinium.

Assertion : In most angiosperms, microspores of a tetrad grow and separate from one another shortly after meiosis. Reason : In the members of families Orchidaceae and Asclepiadaceae, all the pollen grains of a sporangium remain united to form a compact structure called pollinium.