The presence of auxins in a solution could be tested by

Avena sativa stem tip test

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Solution

The correct option is A Avena sativa stem tip test
Avena sativa stem tip test or Avena curvature test is a diagnostic test for auxin. In this test auxins accumulate on the dark side (not exposed to light) of oat coleoptile and cause more growth on the darker side than the exposed side. Thus, causing a curvature stem towards the source of light.

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