10 minutes maximum! Can you do it in 5?

2. The diagram below shows an animal cell.

X shows the organelles that are involved in respiration. These are called ..

• A. Vacuoles
• B. Mitochondria
• C. Chloroplasts
• D. Muscle cells
  

3+4: Complete the word equation for aerobic respiration. 

5. Humans need the energy released in respiration for ..

• A. movement
• B. keeping warm
• C. chemical reactions to build larger molecules
• D. all of the above

6. When running a 200m race what substance may build up in the muscle cells as a result of anaerobic respiration?

• A. ethanol
• B. carbon dioxide
• C. lactic acid
• D. glucose

7-9: Some students carried out the experiment shown below. They measured the effect of temperature on the rate of fermentation in yeast by counting the number of bubbles produced in 30 seconds with the water bath set at different temperatures.

7. What substance would be made in the boiling tube containing the yeast and glucose solution?

• A. Water
• B. Ethanol
• C. Lime water
• D. Glucose

8. Which substance could be used in tube X to show that the gas produced is carbon dioxide?

• A. Water
• B. Ethanol
• C. Lime water
• D. Hydrochloric acid

9. Which is the dependent variable in this experiment?

• A. The concentration of glucose
• B. The concentration of yeast
• C. The temperature of the glucose and yeast solution
• D. The number of bubbles of gas produced per 30 seconds.

10. A student used the apparatus shown in the diagram to measure the rate of respiration of some germinating seeds.

She then set up a second set of apparatus to act as a control.

Which of the following should be done to set up a controlled experiment?

• A. Change the computer
• B. Remove the temperature probe
• C. Replace the geminating seeds with an equal volume of dead seeds
• D. Do the experiment in a flask that is not insulated.