Question:
Indole-3-acetic acid (auxin) was first isolated from ________.
Indole-3-acetic acid (auxin) was first isolated from ________.
Show Hint
Historic isolation of IAA = Human urine.
Updated On: Apr 17, 2026
- rice bran oil
- rhizopus
- human urine
- coleoptiles of oat seedlings
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Concept
Auxins are vital plant hormones discovered through several historic experiments.
Step 2: Meaning
IAA is the most common natural auxin found in plants.
Step 3: Analysis
While its effects were first studied in oat coleoptiles, the chemical compound Indole-3-acetic acid was first physically isolated from human urine.
Step 4: Conclusion
IAA was first isolated from human urine.
Final Answer:(C)
Auxins are vital plant hormones discovered through several historic experiments.
Step 2: Meaning
IAA is the most common natural auxin found in plants.
Step 3: Analysis
While its effects were first studied in oat coleoptiles, the chemical compound Indole-3-acetic acid was first physically isolated from human urine.
Step 4: Conclusion
IAA was first isolated from human urine.
Final Answer:(C)
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