Dr. F. Went noted that is coleoptile tips were removed and placed on agar for one hour , the agar would produce a bending when placed on one side of freshly cut coleoptile stumps .Of what sighifcance is this exeriment
A. It demonstrated polar movement of aux- ins.
B. It made possible the isolation and ex- act identification of auxin.
C. It is the basis for quantitative determi- nation of small amounts of growth-pro- moting substances
D. It supports the hypothesis that IAA is auxin
