1) Photorespiration _____. a) generates carbon dioxide and consumes ATP and oxygen b) generates ATP and sugars and consumes oxygen and carbon dioxide c) generates oxygen and consumes ATP, carbon dioxide, and sugars d) consumes carbon dioxide and generates ATP, sugars, and oxygen 2) Why are C4 plants able to photosynthesize with no apparent photorespiration? a) They do not participate in the Calvin cycle. b) They use PEP carboxylase to initially fix CO2. c) They conserve water more efficiently. d) They exclude oxygen from their tissues. 3) CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they _____. a) fix CO2 into organic acids during the night b) fix CO2 into sugars in the bundle-sheath cells c) fix CO2 into pyruvate in the mesophyll cells d) use photosystem I and photosystem II at night 4) The alternative pathways of photosynthesis using the C4 or CAM systems are said to be compromises. Why? a) Each one minimizes both water loss and rate of photosynthesis. b) C4 compromises on water loss and CAM compromises on photorespiration c) Both minimize photorespiration but expend more ATP during carbon d) CAM plants allow more water loss, while C4 plants allow less CO2 into the plant. 5) Compared to C3 plants, C4 plants _____. a) can continue to fix CO2 even at lower CO2 concentrations and higher oxygen concentrations b) have higher rates of photorespiration c) do not use rubisco for carbon fixation d) make a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria 6) Which of the following statements is true concerning the accompanying figure? a) It represents a C4 photosynthetic system. b) It represents an adaptation that maximizes photorespiration. c) It represents a C3 photosynthetic system. d) It represents a CAM photosynthetic system 7) Referring to the accompanying figure, oxygen would inhibit the CO2 fixation reactions in _____. a) cell I only b) cell II only  c) neither cell I nor cell II d) both cell I and cell II 8) Example of C4 plants is a) Cactus b) Sugarcane c) Paddy d) Pineapple 9) Example of C3 plants is a) Cactus b) Sugarcane c) Paddy d) Pineapple 10) Example of CAM plants is a) Cactus b) Sugarcane c) Paddy d) Maize 11) Krantz anatomy can be found on the following plants, Except a) Cactus b) Sugarcane c) Sorghum d) Maize 12) During night, CAM plant store malate in  a) Mesophyll cell b) chloroplast c) Cytoplasm d) vacuole 13) The following are the similarity between C4 and CAM plants, EXCEPT a) Carbon fixation occurs twice b) CO2 is first converted to oxaloacetate c) Enzyme for carbon fixation: PEP carboxylase in first carbon fixation and rubisco in second carbon fixation d) Carbon fixation occur in mesophyll cells and bundle sheath cells

Photosynthesis in C4 and CAM Plants

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