Describe and experiment which demonstrates that growth stimulating hormone is produced at the tip of coleoptile.

Explanation

Fruits Warmolt Wnet, a Dutch biologist demonstrated the existence and effect 3 of auxin in plants. He did a series of experiments in Avena coleoptiles.

(i) First experiment: He removed the tips of Avena coleoptiles.
Results : The cut tips did not grow indicating that the tips produced something essential for growth.
(ii) Second experiment: He placed the agar blocks on the decapitated coleoptile tips.
Result: The coleoptile tips did not show any response.
(ii) Third experiment: He placed the detached coleoptile tips on agar blocks. After an hour, he discarded the tips and placed this agar block on the decapitated coleoptile.
Result: It grew straight up indicating that some chemical had diffused from the cut coleoptiles tips into the agar block which stimulated the growth.
Conclusion: From this experiments Went concluded that a chemica diffusing from the tip of coleoptiles was responsible for growth and he named it as "Auxin" meaning "to grow".