Question

what are pollen grain​

Answer 1

Answer:

each of the microscopic particles, typically single cells, of which pollen is composed. Pollen grains have a tough coat that has a form characteristic of the pollen-producing plant and which can still be recognized in some archaeological deposits

Explanation:

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Answer 2

Answer:

Each pollen grain is a minute body, of varying shape and structure, formed in the male structures of seed-bearing plants and transported by various means (wind, water, insects, etc.) to the female structures, where fertilization occurs. ... In angiosperms, pollen is produced by the anthers of the stamens in flowers