Single correct option
The plant hormone mainly responsible for cell elongation and phototropism is
- A. auxin
- B. abscisic acid
- C. cytokinin
- D. ethylene
Show answer and solution
Answer: (A) auxin
Auxin is made at the shoot tip and moves to the shaded side, where it makes cells grow longer, so the shoot bends towards light. Gibberellin promotes stem growth and seed germination, cytokinin promotes cell division, and abscisic acid inhibits growth.
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