植物茎的向光性是由于单侧光照引起了(  ) A.呼吸作用加强   

植物茎的向光性是由于单侧光照引起了( 

A.呼吸作用加强           B.蒸腾速度加快

C.生长素不均匀分布       D.光合作用增强

答案

C

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