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Answer each question and check where every mark went.
- 1
Question 1
A scientist investigates aerobic and anaerobic respiration in yeast by measuring CO₂ production under two conditions: with oxygen present (aerobic) and without oxygen (anaerobic, liquid paraffin used to exclude air). She also investigates the effect of temperature on the rate of anaerobic respiration in yeast.
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10 marksOpen › - 2
Question 2
During a 400 m race, an athlete's muscles respire both aerobically and anaerobically. After the race, the athlete continues to breathe rapidly for several minutes.
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9 marksOpen › - 3
Question 3
The kidneys are the main excretory organs in humans. Urine is formed in the microscopic nephrons of the kidney.
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9 marksOpen › - 4
Question 4
The liver is involved in both metabolism and excretion. The table below shows the concentration of urea and glucose in blood entering and leaving the liver, and in blood entering and leaving the kidneys, in a healthy person who has just eaten a high-protein meal.
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10 marksOpen ›