Develop information-handling skills by transferring values between formats, calculating biological rates and describing patterns with comparative data and units.
Scientists measured the rate of photosynthesis in the leaves of a sunflower plant, Helianthus annuus.
The scientists used the apparatus shown in Fig. 3.1 to measure the rate of photosynthesis.
Fig. 3.1
The apparatus in Fig. 3.1 maintains a constant temperature and a constant humidity.
The apparatus was left for 15 minutes.
Explain how the scientists would use the readings for the concentration of carbon dioxide in chambers 1 and 3 to calculate the rate of photosynthesis.
The scientists carried out another investigation using the same apparatus at different temperatures.
They measured the rate of uptake of carbon dioxide in the light and then they measured the rate of release of carbon dioxide in the dark.
The results are shown in Fig. 3.2.
rate of carbon dioxide uptake and release per hour per of leaf
Fig. 3.2
Use the information in Fig. 3.2 to complete Table 3.1.
Table 3.1
Acid rain has negative effects on many ecosystems.
One group of students recorded the change in temperature as the seeds germinated in five insulated flasks, labelled A to E.
Describe the results obtained by group 1.