Question

Describe an experiment that demonstrates that growth-stimulating hormone is produced at the tip of the coleoptile.

Answer 1

Went’s experiment was done by Frits warm out. This experiment demonstrates the growth-stimulating hormone Auxin is produced at the tip of the coleoptile.

He did a series of experiments in Avena Coleoptiles. In his first experiment, he removed the tips of Avena coleoptiles. The cut tips did not grow, indicating that the tips produced something essential for growth.
In his second experiment, he placed the agar blocks on the decapitated coleoptile tips. The coleoptile tips did not show any response.

In his third experiment, he placed the detached coleoptile tips on agar blocks. After an hour, the tips were discarded and placed this agar block on the decapitated coleoptile. It grew straight up, indicating that some chemical had diffused from the cut coleoptile tips into the agar block, which stimulated the growth.

From these experiments, Went concluded that, the chemical diffusing from the tip of coleoptile was responsible for the growth and he named it “Auxin”.