Plant Hormones Quiz
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5 questions, one answer each
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1. Which plant hormone is primarily responsible for controlling phototropism in plant shoots?
- A. Auxin
- B. Gibberellin
- C. Ethene
- D. Abscisic acid
2. Gibberellins are commercially used in agriculture to promote two important processes. Which pair correctly identifies both of these uses?
- A. Fruit ripening and seed germination
- B. Seed germination and fruit growth
- C. Leaf yellowing and root development
- D. Fruit ripening and plant dormancy
3. A student investigates how light direction affects plant shoot growth. The shoots are placed horizontally with light coming from one side. After several days, the shoots bend towards the light. Which statement best explains this observation at the cellular level?
- A. Auxin moves towards the light source, causing cells on the lit side to elongate more
- B. Auxin accumulates on the shaded side, causing cells on that side to elongate more
- C. Gibberellin is destroyed by light, slowing growth on the lit side
- D. Cells on the lit side divide more rapidly than cells on the shaded side
4. Auxins are used as weed killers in agriculture. Why is this application of auxins effective as a herbicide?
- A. Auxins prevent weeds from photosynthesising
- B. Auxins cause uncontrolled, abnormal growth patterns in broad-leaved weeds, causing them to die
- C. Auxins reduce water uptake in weed roots
- D. Auxins block nutrient absorption in weed stems
5. A farmer wants to design an investigation to test how light intensity affects plant shoot growth. Which of the following represents the best experimental design?
- A. Grow plants in darkness and expose half to varying light intensities, keeping all other variables constant
- B. Grow identical plants under different light intensities, keeping temperature, water, and light direction constant for each treatment
- C. Grow plants under different light intensities and change the watering frequency for each treatment
- D. Grow plants in white light, then repeat under different coloured lights at different intensities