Question

Avena coleoptile test to find out the quantity of growth promoting hormones was discovered by ______.

Options

• F.W. Went

• L.J. Oudus

• K.V. Thimann

• F. Skoog

Answer 1

Avena coleoptile test to find out the quantity of growth promoting hormones was discovered by F.W. Went.

Explanation:

Frits Warmolt Went developed the Avena (oat) curvature test in 1926 to isolate and measure the concentration of the plant growth hormone, auxin. He demonstrated that when agar blocks containing extracted auxin were placed unilaterally on decapitated oat coleoptiles, the hormone diffused downward and stimulated differential cell elongation, causing the tip to bend away from that side. The degree of this curvature was found to be directly proportional to the quantity of the hormone present, making it the first successful bioassay for plant growth regulators.