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这是因为叶背和叶面的细胞结构明显不同。如果我们对植物的叶子做横切面切片,在显微镜下观察横切面上的细胞结构便可以发现,叶面紧密排列着长方形的细胞,就像栅栏一样,即栅栏组织;叶背的细胞排列疏松,就像海绵一样,即海绵组织。栅栏组织结构紧密、密度较大,海
This is because the cell structure of leaf back and foliage is significantly different. If we cross the leaves of plants cross-section, the microscope under the cross-section of the cell structure can be found, the foliage closely arranged rectangular cells, like the fence, that is palisade tissue; leaf back cell arranged loose, Like a sponge, sponge tissue. Fence tissue structure, density, sea