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Solution


Q.

Dr. F. Went noted that if 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 significance is this experiment          [2014]
1 It made possible the isolation and exact identification of auxin.  
2 It is the basis for quantitative determination of small amounts of growth-promoting substances.  
3 It supports the hypothesis that IAA is auxin.  
4 It demonstrated polar movement of auxins.   

Ans.

(4)