Tropic Responses Quiz
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5 questions, one answer each
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1. What is phototropism?
- A. A growth response to gravity
- B. A growth response to light
- C. A growth response to touch
- D. A growth response to temperature
2. Which best describes the response of a plant shoot to light and gravity?
- A. Positively phototropic, positively gravitropic
- B. Negatively phototropic, negatively gravitropic
- C. Positively phototropic, negatively gravitropic
- D. Negatively phototropic, positively gravitropic
3. Where is auxin produced in a plant shoot?
- A. In the root tip
- B. In the shoot tip
- C. In the leaf mesophyll
- D. In the flower petals
4. A shoot is lit from one side only. Which statement correctly explains why it bends towards the light?
- A. Auxin is destroyed on the illuminated side
- B. Auxin accumulates on the shaded side, causing more cell elongation there
- C. Water evaporates faster on the illuminated side, shrinking those cells
- D. Chlorophyll pulls the shoot towards the light
5. A student places a germinating seed on its side in a dark box for two days. The root grows downward and the shoot grows upward. Which combination of tropic responses explains this?
- A. Root: negatively gravitropic; Shoot: positively gravitropic
- B. Root: positively gravitropic; Shoot: negatively gravitropic
- C. Root: positively phototropic; Shoot: negatively phototropic
- D. Root: negatively phototropic; Shoot: positively phototropic