Natural Science
Undergraduate
請問根的木質部問題，他是外源式發育，所以靠外面的是先成熟的木質部，叫做先成木質部，但是他是由年輕的導孔組成，為什麼？先成熟的話不是會比較老嗎？
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請問根的木質部問題，他是外源式發育，所以靠外面的是先成熟的木質部，叫做先成木質部，但是他是由年輕的導孔組成，為什麼？先成熟的話不是會比較老嗎？
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