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  4. The natural plant hormones were first isolated from :

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Q. The natural plant hormones were first isolated from :

Plant Growth and Development

Solution:

The first naturally occuring auxin was isolated by Kogl and Haagen-Smit (1931) from human urine. It was identified as auxin-a (auxentriolic acid). Later, in 1934 Kogl, Haagen-Smit and Erxleben obtained another auxin called auxin-b (auxenolonic acid) from corn germ oil (extracted from germinating corn seeds).