Question

13 Relate the structure of ATP to its function14 Figure 4.5.2 shows the relationship between net carbon dioxide production and uptake by a green plantover time.on dioxidePracticese and oxygendanaerobically during streama Determine at what time the rate of photosynthesis would be equal to the rate of respiration,b Decide if the plant was put under light or dark conditions for the first 10 minutes of the experiment.Explain why you think so.seolC Predict what happened after 10 minutes to cause the changed Suggest a reason why the carbon dioxide uptake levelled off at 30 minutes. Predict some limiting factors.e Predict what would happen to cellular metabolism if the temperature surrounding the plant increasedbeyond the plant's limit.f Explain why the carbon dioxide concentration in the air surrounding the plant can be used as ameasure of the rate of photosynthesis.me relationshipbond energy isdecrease inbe specialised to produce20COuptakeFIGURE 4.5.2The relationshipbetween net carbondioxide productionand uptake by agreen plant0cellular respirationCO2produced5010 20 30 40Time (min)ItoCHAPTER 4 - ENERGY AND METABOLISM 81pri

Answer 1

a. approximately 20 minutes

b. dark, CO2 production dropped

c. Co2 production increases meaning respiration increased and th euptake of CO2 also increases suggesting that the rate of photosynthesis increases so it must be in light conditions

d. the rate of CO2 uptakes levels out and this is probably because the maximum rate of photosynthesis is reached due to limited sunlight or water available

e. If the temperature increases beyond the plants limit, cellular metabolism would drop and the plant would eventually die

f. the carbon dioxide in the air can be used as an indicator of the rate of photosynthesis because the photosynthesis process takes up carbon dioxide from the environment to produce sugars. a rate of change of the concentration of carbon dioxide in the environment around the plant indicates the rate of photosynthesis in the plant.