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植 物 的 叶

植 物 的 叶. 把一盆生长旺盛的天竺葵放在黑暗处一昼夜. 把处理过的天竺葵叶片从上下两面 用小于叶片的黑纸片遮盖起来. 把部分遮光后的天竺葵 放在光下照射 30 分钟. 摘下叶片,去掉纸片,观察叶片是什么颜色.

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植 物 的 叶

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