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【单选题】
植物激素作为植物体内的信号分子,在调节植物生长发育过程和环境应答中具有十分重要的意义,下列叙述错误的是( )
A.
生长素的极性运输是一种耗能的主动运输,生长素的生理作用具有两重性
B.
根尖合成的细胞分裂素可以调控细胞内相关基因的表达以促进细胞分裂
C.
环境因子只能通过激素来影响植物的各项生命活动
D.
植物体各个部分均可合成乙烯,但总含量极少
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