Gas Exchange Quiz
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5 questions, one answer each
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1. By what process do gases move into and out of a leaf?
- A. Active transport
- B. Osmosis
- C. Diffusion
- D. Peristalsis
2. Which structures control the opening and closing of stomata?
- A. Palisade cells
- B. Guard cells
- C. Xylem vessels
- D. Alveoli
3. A leaf is sealed in a test tube with hydrogen-carbonate indicator and left in bright light. What colour change is expected?
- A. Turns yellow, as CO2 increases
- B. Turns purple, as CO2 decreases
- C. Stays orange/red, no change
- D. Turns colourless
4. Which combination correctly explains why alveoli are efficient at gas exchange?
- A. Thick walls and low surface area
- B. Thin walls, large surface area, moist lining, good blood supply
- C. Thick walls and high surface area only
- D. Dry lining and thin walls
5. A student measures the rate of breathing before and after exercise and also finds the person is a smoker. Which explanation best links smoking to reduced gas exchange efficiency during exercise?
- A. Smoking has no effect on gas exchange during exercise
- B. Tar damages alveoli, reducing surface area, while carbon monoxide reduces the blood's oxygen-carrying capacity, both limiting oxygen delivery during exercise
- C. Smoking only affects the heart, not the lungs
- D. Nicotine increases alveolar surface area