The server is under maintenance between 08:00 to 12:00 (GMT+08:00), and please visit later.
We apologize for any inconvenience caused
Login  | Sign Up  |  Oriprobe Inc. Feed
China/Asia On Demand
Journal Articles
Laws/Policies/Regulations
Companies/Products
Bookmark and Share
yong huo shao fei teng fa guan cha zhi wu jing nei de shu shui guan
Author(s): 
Pages: 46
Year: Issue:  2
Journal: Experiment Teaching and Apparatus

Abstract: <正>人教版小学自然第九册第十一课的内容是观察植物茎内有输送水分和养料的细管。教科书上的方法是用刀切割植物的茎,观察到茎上渗出水滴,将植物浸在红水里,过一段时间,把植物水面上部的茎横切、纵切后,观察到植物的表皮内呈红色,这是因为植物吸收被红水染红的水分后,沿茎往上输送水分的缘故。此现象说明植物的茎内有
Related Articles
No related articles found