Practice question
Question
Auxin was first discovered during studies on which plant response?
Explanation
That points to B: Phototropism. Compared with the other options, Phototropism is the one that correctly describes the Auxin Phytohormone concept. The wrong ones are A) Gravitropism; C) Hydrotropism; D) Thigmotropism. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.