Multiple Choice
Which of the following best describes a C3 plant?
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9. Photosynthesis
C3, C4 & CAM Plants
Multiple Choice
CAM plants keep stomata closed in the daytime to reduce the loss of water. They can do this because they:
A
Fix CO2 into organic 4-Carbon compounds during the night
B
Fix CO2 into organic 4-Carbon compounds in the bundle-sheath cells.
C
Fix CO2 into pyruvate in the mesophyll cells.
D
Use photosystem I and photosystem II at night only.
Verified step by step guidance1
Understand the unique adaptation of CAM plants: CAM (Crassulacean Acid Metabolism) plants have adapted to arid conditions by altering their photosynthetic process to minimize water loss.
Recognize the role of stomata: Stomata are small openings on the surface of leaves that allow for gas exchange. In CAM plants, these stomata remain closed during the day to conserve water.
Identify the nighttime process: At night, CAM plants open their stomata to take in CO2, which is then fixed into organic acids, typically 4-carbon compounds, in the mesophyll cells.
Explain the storage of CO2: The CO2 is stored in the form of organic acids in vacuoles overnight, allowing the plant to perform photosynthesis during the day when the stomata are closed.
Connect to the daytime process: During the day, the stored CO2 is released from the organic acids and used in the Calvin cycle to produce sugars, utilizing the energy from photosystems I and II.
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