Respiration

Worked examples (12)extended set

• 1Matching activities to the uses of energy
• 2Which statement about respiration is correct? (multiple choice)
• 3Counting bubbles from yeast: variables and improvements
• 4Yeast, temperature and an optimum
• 5Methylene blue and yeast: timing a colour change
• 6Balloons on flasks of yeast: evaluating a simple method
• 7Timing hydrogencarbonate indicator with yeast at different temperatures
• 8Choosing the correct temperature graph (multiple choice)
• 9Planning an investigation into temperature and yeast respiration
• 10Keeping warm costs energy: a mouse and a lizard
• 11Ion uptake by roots: temperature, oxygen and energy
• 12Temperature and yeast in bread-making

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 6 (Alternative to Practical) style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Completing the definition and word equation
• 2Finding the site of aerobic respiration in a cell
• 3Balanced equation and counting molecules
• 4What aerobic and anaerobic respiration have in common (multiple choice)
• 5Molecules of oxygen and carbon dioxide from four glucose (multiple choice)
• 6The gas leaving a respiring muscle cell
• 7Germinating peas and hydrogencarbonate indicator
• 8Rate of oxygen uptake from a respirometer
• 9Why a climber tires quickly at high altitude
• 10Oxygen supply and nitrate uptake by roots
• 11Oxygen and carbon dioxide sensors in a sealed flask
• 12Planning: seed age and rate of aerobic respiration

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 6 (Alternative to Practical) style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Comparing three types of respiration
• 2The word equation for muscles (multiple choice)
• 3Balanced equation for yeast and counting carbon dioxide
• 4Correcting an account of the oxygen debt
• 5Filling in a flow diagram of the oxygen debt (multiple choice)
• 6Breathing rate and heart rate after exercise
• 7Yeast, glucose concentration and a results table
• 8Lactic acid after races of different distances
• 9Energy released from glucose in a sprint
• 10Yeast in a sealed fermenter
• 11Aching arms from holding a heavy box
• 12Evaluating a bubble-counting investigation

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style