Which hormone is used to create a hedge in a garden?

Which plant hormone prevents the premature shedding of leaves and fruits but promotes the abscission of older,mature leaves and fruits?

Which of the following is widely used to kill dicotyledonous weeds without affecting mature monocotyledonous plants?

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?

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Which type of phytohormone is made up of indole compounds?