Practice question
Question
Optimal apoplastic pH favoring auxin uptake is:
Explanation
The right choice is C: 5.0–5.5. In Auxin Phytohormone, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) 7; B) 6.5; D) 4. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
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