Learning Exercise

Exercise 1 Describe the main pathways by which C3, C4 and CAM plants get CO2 for photosynthesis Exercise 2 In a closed container with a CO2 concentration of 0.0035 %, there is one C3, one C4 and one CAM plant. They get light for 12 hours a day and are left in the dark for the remaining 12 hours. Their other living conditions are identical, such as the temperature, access to water and their soil. Which one of the plants do you think will survive the longest? Give the reasons for your answer. Exercise 3 In some plants there can be a huge variation in pH during the course of a day. What’s the reason for this, and in which organelle does it occur? Exercise 4 Explain how the stem and the leaves are adapted to minimise the loss of water in succulents?