Plant Structure Quiz
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5 questions, one answer each
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1. Which feature increases root hair cell surface area?
- A. Large vacuole
- B. Long thin extension
- C. Many mitochondria
- D. Lignified wall
2. Why must xylem cells be dead?
- A. Photosynthesise efficiently
- B. More mitochondria for transport
- C. Form hollow unobstructed tubes
- D. Control stomata opening
3. Why do phloem sieve tubes need companion cells?
- A. Provide lignin
- B. Supply energy for active sucrose loading
- C. Absorb light
- D. Control water loss
4. Desert plant with small leaves, thick cuticle, sunken stomata: main advantage?
- A. Increases photosynthesis rate
- B. Increases gas exchange surface area
- C. Reduces water loss while allowing gas exchange
- D. Increases sucrose transport
5. Removing air spaces from spongy mesophyll would most likely:
- A. Increase active transport of ions
- B. Reduce rate of gas diffusion within the leaf
- C. Increase lignification of xylem
- D. Reduce sucrose translocation