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 s

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1、Thefollowingfigureisthreeoatseedlings(燕麦幼苗).TheseedlingsinAandCarenormal,andseedlinginBistheonewho

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 s
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 __________________________________.

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 s
Several days later,seedling in A grows toward to the air straightly
B grows toward to the air straightly
C grows toward the light