Charles Darwin experimented with reactions of grass seedlings monocots) relative to applied auxin a plant hormone) and light. He used the youngest seedlings with a structure that dicots do not have. What is the name of that structure?

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The structure that monocot seedlings have and dicots don't have is the coleoptile. Charles Darwin used the youngest seedlings with coleoptile to conduct his experiments on plant hormone auxin and light.

Charles Darwin Experimented with Reactions of Grass Seedlings Monocots) Relative