In seed plants, the part of a pollen grain that has a function most like that of the seed coat is Sporopollenin.
Sporopollenin is one of the most chemically inert biological polymers.
Sporopollenin is a major component of the tough outer walls of plant spores and pollen grains, usually has a function most like that of the seed coat.
Thus, in seed plants, the part of a pollen grain that has a function most like that of the seed coat is Sporopollenin.
Learn more about Sporopollenin here: https://brainly.com/question/1543124
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