Stomata: controllable pores that permit CO2entry but also water exit. How can high enough levels of CO2be maintained without too much water loss?
Raising CO 2 concentration by capture without rubisco C 4 plants capture CO 2 in mesophyll cells using PEP carboxylase, which is not sensitive to O 2 CO 2 is released in the bundle-sheath cells, and enters the Calvin cycle Efficiency of photosynthesis is improved by reduction in photorespiration
CAM plants (Crassulacean Acid Metabolism): • open stomata at night when it’s cooler, and there’s less danger of water loss, fix CO 2 by C4 • close stomata during the day to preserve water, release stored CO 2 Agave
The fate of synthesized carbohydrates in plants: Starch (storage) or sucrose (transported within plant) bucketandshack.jpg
Review: chapter 10 Photosynthesis : 2 reactions in chloroplasts 1) ATP and the electron carrier NADPH are produced. Requires energy input from light, which is captured by photosystems I and II 2) (no light required) ATP and NADPH are used to reduce carbon dioxide (CO 2 ) to carbohydrate (CH 2 O) n
For Chapter 10, be able to: • Explain the energy flow and conversion of photosynthesis. • Describe how ATP is produced during the light- capturing reactions of photosynthesis. • Understand the purpose of the Calvin cycle and how it relates to photosynthesis. • Discuss the importance of the CAM and C4 pathways and how they increase efficiency in photosynthesis.
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