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Chapter 10 Question 11 Compare and contrast how C4 plants and CAM plants separate the acquisition of CO2 from the production of sugar in the Calvin cycle. Part A What do they have in common? Check all that apply. They generates an organic acid with four carbons by fixing CO2 to a 3-carbon molecule by rubisco. Both are found in species that live in cold, humid environments. They increase photorespiration. Both are found in species that live in hot, dry environments. They act as an additional, preparatory step to the Calvin cycle. They require more energy in the form of ATP then Cs plants. They generates an organic acid with four carbons by fixing CO2 to a 3-carbon molecule by PEP carboxylase. They replace the Calvin cycle. They function as CO2 pumps increasing the ratio of carbon dioxide to oxygen in photosynthesizing cells. They require less energy in the form of ATP then C3 plants Submit My Answers Give Up
Compare and contrast how C4 plants and CAM plants separate the acquisition of CO2 from the production of sugar in the Calvin cycle.

Answer 1

Part-A: Common in C4 and CAM plants

1. They generates an organic acid with 4 carbons by fixing CO₂ and to a 3 carbon molecule by PEP carboxylase.
2. Both are found in species that live in hot and dry environments.
3. They require more energy in the form of ATP then c3 plants.
4. C₄ and CAM   plants function as CO₂ pumps increasing the ratio of carbon dioxide to oxygen in photosynthesizing cells.

Part-B : Difference between C4 and CAM plants

C4 Plants	CAM Plants
The reactions are catalysed by PEP carboxylase and Rubisco is separated in space	The reactions are catalysed by PEP carboxylase and Rubisco is separated in time
Include sugarcane and maize	Stomata open at night
Rubisco is located in bundle sheath cells	Include the crassulaceae
The carbon fixing enzyme is present in mesophyll	The CO2 is temporarily fixed to organic acid and stored in central vacuoles of photosynthetic cells