Sporopollenin
Sporopollenin is a biological polymer found as a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and has been described as the "toughest material in the plant kingdom".
Sporopollenin is a biological polymer found as a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and has been described as the "toughest material in the plant kingdom".
Sporopollenin is a biological polymer found as a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and has been described as the "toughest material in the plant kingdom".
Source: Wikipedia "Sporopollenin" · CC BY-SA 4.0
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