Multiple choice

The main naturally occurring auxin is indole-3 acetic acid, IAA. It was first isolated from ____________.

  1. human urine

  2. human faeces

  3. corn germ oil

  4. human serum

  5. human plasma
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A Correct answer
Explanation

Natural auxin: It was first isolated from human urine by Kogl and Haagensmit. It was named as auxin-a. But later, Kogl obtained another auxin called auxin-b (auxentriolic acid) from corn germ oil and heteroauxin from human urine. Heteroauxin, also known as indole-3-acetic acid (IAA) is the best known natural auxin. Indole butyric acid is another natural auxin.

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