Who among the following discovered the $Avena$ curvature test to find out the concentration of auxins?

Dr. $F$. Went removed the coleoptile tips and placed them in agar for one hour. The agar block then caused curvature in decapitated coleoptiles. What does this experiment demonstrate?

Synthetic auxins are used for

In tobacco,enzymatic activity can be retarded by

Phototropism in shoots is attributed to

To induce flowering in Litchi and Pineapple,which hormones are used for foliar spray?