5 a day revision Bioenergetics A B Photosynthesis In which part of the cell does photosynthesis take place? State 3 uses of the glucose produced in photosynthesis. What is the word and balanced symbol equation for photosynthesis? A plant is placed in the dark for 48 hours. A piece of black paper is then placed over part of a leaf as shown. The plant is left in light for 24 hours and then the leaf is tested for the presence of starch. What chemical would you use to test for starch? What colours would be observed at areas A and B, why? Explain why cacti have fewer stomata than other plants. A B

Use the results to identify the limiting factor at points A, B and C. 5 a day revision Bioenergetics Limiting factors State the inverse square law and explain how it links light intensity and distance. An experiment was carried out to investigate the effect of temperature on light intensity. Name 2 variables that should be controlled. Why might heart valves need to be replaced? Apart from temperature, state 3 other limiting factors for photosynthesis. Counting bubbles may not be the best way to measure the rate of photosynthesis. Suggest why and explain an alternative to solve this issue. An experiment to investigate the effect of light intensity on photosynthesis was carried out at two concentrations of carbon dioxide and two temperatures. Use the results to identify the limiting factor at points A, B and C.

5 a day revision Bioenergetics Respiration Give 3 differences between aerobic and anaerobic respiration. . What is respiration? Give the word equation for anaerobic respiration in yeast cells. What is the role of anaerobic respiration in bread making? Sketch a graph to show the changes in sugar and ethanol concentration as yeast grows. Explain the shape of your graph.

What is the word equation for anaerobic respiration in muscle cells? Bioenergetics Response to exercise 5 a day revision What is metabolism? Why might heart valves need to be replaced? What is the word equation for anaerobic respiration in muscle cells? What is an oxygen debt? Suggest 2 measurements that you could take to investigate the effect of exercise on the body. The graph shows the effect of running on the rate of blood flow through an athlete’s muscles. Explain how the change in blood flow to the athlete’s muscles helps him to run.