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Would you expect the greenhouse effect (an increase in the CO2 content of the armoshere to have a greater effect on C4 or C3 Plants? Why?

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Deanna Hettinger
Deanna HettingerLv2
28 Sep 2019
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Related questions

There are two types of plants C3 and C4 plants. In C3plants, Ribulose bisphosphate can fix carbon as explained in thismodule leading to the formation of 3- Phosphoglycerate andeventually formation of sugar through the Calvin cycle. Ribulosebisphosphate is also able to catalyze the reaction in which oxygenis transformed into glycolate which eventually forms CO2 (a processcalled photorespiration). Therefore, in C3 plants, oxygen andcarbon dioxide compete for RuBP. In C4 plants, carbon dioxideinitially reacts with phosphoenol pyruvate to make malate andoxaloacetate. The products of this reaction are then able to travelto an inner compartment of the leaf that contains RuBP and sugar iseventually made. Since RuBP is contained in an inner compartment,oxygen is not able to react with it.

(1) Why are C4 plants able to continue photosynthesiseven at low CO2 levels.

(2) Would you expect the greenhouseeffect (an increase in CO2 content of the atmosphere) to have agreater effect on C3 or C4 plants? Why?

CO2 levels have increased worldwide due to anthropogenic emissions. Projections suggest these will continue to increase over the rest of our lifetimes. Extrapolate the consequences of this on competition between C3 and C4 plants and explain in terms of the differing chemistries between these plants. How will the concomitant increase in temperatures due to the greenhouse effect affect his competition

2. There are two types of plants, C3 and C4. C3 plants use the Calvin Cycle to generate sugar. C4 plants use phosphoenol pyruvate to make malate and oxaloacetate which will eventually be used to make sugar. Both types of plants have stomatas (openings on leaves that can be opened and closed) for CO2 entry. In addition, water is also lost through the stomata. C3 plants are only able to synthesize sugar at relatively high CO2 levels because photosynthesis will stop when CO2 production from the mitochondria equals the use of CO2 in the chloroplasts. C4 plants are able to continue photosynthesis even at low CO2 levels. (1) Why are C4 plants able to survive in hot, dry conditions when C3 plants are not? (2) Plants can develop cancer but it is usually from an infection not from the ionizing rays of the sun. What part of the photosynthesis pathway do you think protects the plant form sun damage?

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