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Auxin has been clearly demonstrated in the leaf sheath or coleoptile of oat plant (Avena sativa). This plant coleoptile has been used for the test of hormone Auxin (IAA) participating in the growth of the plant.

1. Auxin is found in oat coleoptile.
2. Auxin is tested in Avena sativa.
3. Auxin is a plant growth hormone.
4. Auxin is demonstrated in coleoptile.

Correct answer: Auxin is tested in Avena sativa.

Solution

The oat coleoptile of Avena sativa was historically used as a test system to detect and measure auxin activity. So the statement is about auxin being tested in Avena sativa, not merely its presence or general role as a hormone.

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