以下有关动物激素和植物激素的叙述中,错误的是(          

以下有关动物激素和植物激素的叙述中,错误的是(           )

A.都是由专门器官分泌的       B.对新陈代谢、生长发育都有重要调节作用

C.在生物体内的含量都极少     D.都是由活细胞产生的

答案

A

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