大师作文网1、The following figure is three oat seedlings（燕麦幼苗）.
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1、The following figure is three oat seedlings（燕麦幼苗）.
The seedlings in A and C are normal,and seedling in B is the one whose coleoptile tip(胚芽鞘尖端) was cut off.Put A and B on uniformly rotating discs(旋转的圆盘),and C on a still disc.The three pots are lightened with
one side light source.Several days later,seedling in A grows toward__________________ B grows toward____________________________ and C grows toward __________________________________.
The seedlings in A and C are normal,and seedling in B is the one whose coleoptile tip(胚芽鞘尖端) was cut off.Put A and B on uniformly rotating discs(旋转的圆盘),and C on a still disc.The three pots are lightened with
one side light source.Several days later,seedling in A grows toward__________________ B grows toward____________________________ and C grows toward __________________________________.
下图是三个燕麦幼苗.
A幼苗和C幼苗是正常的,B幼苗是唯一胚芽鞘尖端被切掉了的.把A和B放在同样的旋转的圆盘上面,把C放在静止的圆盘上.这三个幼苗都只有一侧的光源.
几天之后,A幼苗向上生长,B幼苗没有生长,C幼苗向光源生长.
空格里填 upward、 original place、 light source
A幼苗和C幼苗是正常的,B幼苗是唯一胚芽鞘尖端被切掉了的.把A和B放在同样的旋转的圆盘上面,把C放在静止的圆盘上.这三个幼苗都只有一侧的光源.
几天之后,A幼苗向上生长,B幼苗没有生长,C幼苗向光源生长.
空格里填 upward、 original place、 light source
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