Plant responses to environmental cues

Plant responses to environmental cues Quiz

Spec 8.6 · Edexcel A-Level Biology A: Quiz

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5 questions, one answer each

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  1. 1. Which form of phytochrome is active?

    • A. Pr
    • B. Both
    • C. Neither
    • D. Pfr

  2. 2. What converts Pfr to Pr?

    • A. Far-red light
    • B. Red light
    • C. Blue light
    • D. Gravity

  3. 3. Why do plants in shade grow taller stems?

    • A. A high red to far-red ratio increases Pfr
    • B. IAA is destroyed in shade
    • C. A low red to far-red ratio reduces Pfr, so less inhibition of elongation
    • D. Pr stops transcription

  4. 4. In phototropism, IAA is moved to

    • A. the lit side
    • B. the root tip only
    • C. the shaded side
    • D. the leaves

  5. 5. How does IAA alter transcription?

    • A. It binds DNA directly and destroys introns
    • B. It makes mRNA from proteins
    • C. It converts Pr to Pfr
    • D. It binds to a receptor, which breaks down a repressor so a transcription factor switches genes on

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