Gas Exchange in Plants Quiz
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5 questions, one answer each
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1. Which gas do plants primarily take in through their stomata for photosynthesis?
- A. Carbon dioxide
- B. Oxygen
- C. Nitrogen
- D. Argon
2. What is the name of the specialised cells that control the opening and closing of stomata?
- A. Epidermal cells
- B. Guard cells
- C. Mesophyll cells
- D. Palisade cells
3. Guard cells control stomatal opening by changing their turgor pressure. How does increased turgor pressure in guard cells affect the stoma?
- A. The stoma remains closed as the guard cells become rigid
- B. The stoma closes as the guard cells lose water
- C. The stoma opens as the guard cells swell and bend outward
- D. The stoma opens as the guard cells shrink
4. Plants need to balance two opposing processes related to stomata. Which of the following correctly identifies this dilemma?
- A. Photosynthesis requires stomata to be open, but open stomata increase water loss through transpiration
- B. Respiration requires stomata to be closed, but closed stomata prevent gas exchange
- C. Stomata must stay open at night to allow respiration, but this causes excessive transpiration
- D. Guard cells need potassium to function, which causes water loss and reduces gas exchange
5. A plant closes its stomata during the middle of a hot, dry day. Which two consequences would most directly result from this response?
- A. Increased transpiration and increased photosynthesis
- B. Decreased water loss and decreased carbon dioxide uptake
- C. Increased oxygen production and decreased guard cell turgor
- D. Decreased respiration and increased nitrogen absorption