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Question

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

A
F. W. Went
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B
L. J. Oudus
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C
K. V. Thimann
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D
F. Skoog
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Solution

The correct option is A F. W. Went
In the 1920s, Frits Went, a Dutch scientist, isolated the phototropic hormone from oat coleoptiles. He removed the coleoptile tips and placed them on tiny blocks of agar for a period of time. When he put one of these agar blocks squarely on a decapitated coleoptile, normal growth resumed. When he placed one of these agar blocks to one side of the tip of a decapitated coleoptile in the dark, bending occurred.
The results indicated that the substance had diffused from the coleoptile tip into the agar and, later, from the agar into the decapitated coleoptile.
Went named this substance auxin. The purification and elucidation of the primary auxins chemical structure were accomplished in the mid-1930s by a research team led by U.S. biologist Kenneth Thimann at the California Institute of technology.

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