Plant Organisation and Transport Quiz
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5 questions, one answer each
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1. Which leaf tissue contains the most chloroplasts?
- A. Spongy mesophyll
- B. Palisade mesophyll
- C. Epidermis
- D. Xylem
2. What does xylem transport?
- A. Sugars from leaves to the rest of the plant
- B. Water and mineral ions from roots to leaves
- C. Oxygen from roots to leaves
- D. Carbon dioxide from air to cells
3. What is translocation?
- A. The movement of water through xylem
- B. The movement of dissolved sugars through phloem
- C. The opening and closing of stomata
- D. The division of meristem cells
4. A plant is moved to a hot, dry, windy location. What would you expect to happen to its rate of transpiration, and why?
- A. It would decrease, because stomata close automatically in wind
- B. It would increase, because higher temperature, lower humidity and air movement all speed up evaporation and diffusion of water vapour
- C. It would stay the same, since transpiration is unaffected by environment
- D. It would increase only if light intensity also decreases
5. A student compares water uptake in root hair cells with mineral ion uptake in the same cells. Which statement correctly distinguishes the two processes?
- A. Both use active transport requiring energy from respiration
- B. Water enters by osmosis (passive), while mineral ions are absorbed by active transport (using energy) against a concentration gradient
- C. Water enters by active transport, while mineral ions diffuse in passively
- D. Neither process requires a concentration gradient