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प्रश्न
Give a comparison between the following:
C3 and C4 pathways
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उत्तर
| C3 pathways | C4 pathways | |
| 1. | Ribulose biphosphate is the initial carbon dioxide acceptor. | The first CO2 acceptor is phosphoenol pyruvate, and the second is ribulose biphosphate. |
| 2. | The first product is phosphoglyceric acid. | This is the first product: oxaloacetic acid. |
| 3. | Only the Calvin cycle is used by the plants. | In addition to the Calvin cycle, plants also have a dicarboxylic acid cycle. |
| 4. | The range of CO2 compensation is 25 - 100 ppm. | The CO2 compensation range is 0 - 10 ppm. |
| 5. | Photosynthesis is completed by Mesophy II cells. | Mesophy II cells are limited to first fixation. |
| 6. | The absorption of carbon occurs slowly. | Assimilation of carbon occurs at a rather quick rate. |
| 7. | Plants cannot carry out photosynthesis when CO2 concentrations are very low, between 10 and 50 parts per million. | Even at very low CO2 concentrations of 10 to 50 ppm, photosynthesis is still occurring. |
| 8. | Every plant has a cycle in place. | Only certain plants, such as sugarcane, maize, and others, exhibit the cycle. |
| 9. | One CO2 molecule requires 3 ATP and 2NADPH to fix. | One CO2 molecule needed 5 ATP and 2NADPH to fix. |
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संबंधित प्रश्न
By looking at a plant externally can you tell whether a plant is C3 or C4? Why and how?
By looking at which internal structure of a plant can you tell whether a plant is C3 or C4? Explain.
Give comparison between the following:
Anatomy of leaf in C3 and C4 plants
In the maize plant, \[\ce{CO2}\] fixation occurs in both mesophyll and bundle sheath cells. The enzymes involved in these cells for the process respectively are, ______.
In C4-pathway initial carbon dioxide fixation occurs in chloroplasts of ______.
The first stable product of CO2 fixation in sorghum is ______.
The first stable product of CO2 fixation in sorghum is ______
The enzyme that is not found in a C3 plant is ______.
When CO2 is added to PEP, the first stable product synthesised is ______.
Can girdling experiments be done in monocots? If yes, How? If no, why not?
Some of these terms/chemicals are associated with the C4 cycle. Explain.
Calvin cycle
Some of these terms/chemicals are associated with the C4 cycle. Explain.
PEP carboxylase
Some of these terms/chemicals are associated with the C4 cycle. Explain.
Bundle sheath cells
Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO2 requirements?
In what kind of plants do you come across ‘Kranz’ anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants which lack this anatomy?
Observe the diagram and answer the following.
- Which group of plants exibits these two types of cells?
- What is the first product of C4 cycle?
- Which enzyme is there in bundle sheath cells and mesophyll cells?
Name the two important enzymes of C4 pathway, and explain their role in fixing CO2?
