MDCAT Biology MCQ #2475

In a laboratory experiment, a high concentration of Indole Acetic Acid (IAA) is applied to root tips. What is the observed effect?

MDCAT Biology MCQ #2475

  1. Question 1

    Q1. In a laboratory experiment, a high concentration of Indole Acetic Acid (IAA) is applied to root tips. What is the observed effect?

    • A) Inhibition of elongation
    • B) Promotion of elongation
    • C) Induction of lateral buds
    • D) Increased fruit ripening

    Answer: Inhibition of elongation

    Explanation: High auxin concentrations inhibit root elongation while promoting shoot growth; cytokinins are tempting because they generally promote lateral bud growth instead.