组成韧皮部的细胞是()

A.导管

B.筛管

C.管胞

D.分泌细胞

相关专题： 韧皮部  

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  • 关于环割的作用，错误的说法是（）。

    A、此处理主要阻断了叶片形成的光合同化物在韧皮部的向下运输

    B、此处导致环割上端韧皮部组织中光合同化物积累引起膨大

    C、如果环割不宽，切口能重新愈合

    D、如果环割太宽，环割上端的韧皮部组织因得不到光合同化物而死亡

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