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- 1. Multiple Choice
Explain the process of C3 photosynthesis.
C3 photosynthesis involves the fixation of carbon dioxide into a four-carbon compound
Sugar production in C3 photosynthesis is independent of the Calvin cycle
The process of C3 photosynthesis involves the fixation of carbon dioxide into a three-carbon compound, 3-phosphoglycerate, through RuBisCO enzyme in mesophyll cells, followed by sugar production in the Calvin cycle.
The process of C3 photosynthesis occurs in the bundle sheath cells
- 2. Multiple Choice
Describe the process of C4 photosynthesis.
C4 photosynthesis does not involve any carbon fixation
C4 photosynthesis involves initial fixation of CO2 into a 4-carbon compound in mesophyll cells, followed by transport to bundle sheath cells for decarboxylation.
C4 photosynthesis occurs only in bundle sheath cells
C4 photosynthesis involves fixation of CO2 into a 3-carbon compound
- 3. Multiple Choice
What are the main differences between C3 and C4 photosynthesis?
C3 plants fix CO2 into a 4-carbon compound
C4 plants fix CO2 directly into a 3-carbon compound
C3 plants have a specialized pathway to concentrate CO2
C3 plants fix CO2 directly into a 3-carbon compound, while C4 plants initially fix CO2 into a 4-carbon compound and have a specialized pathway to concentrate CO2.
- 4. Multiple Choice
Why is the C4 pathway important for certain plants?
It increases the rate of water loss during photosynthesis
It helps plants adapt to arid environments by minimizing water loss during photosynthesis.
It has no impact on the survival of plants in arid environments
It decreases the efficiency of photosynthesis in plants
- 5. Multiple Choice
Which plants are known to use C4 photosynthesis?
Wheat, barley, oats
Tomatoes, cucumbers, peppers
Maize, sugarcane, sorghum, certain types of grasses
Carrots, radishes, beets
- 6. Multiple Choice
How do C3 and C4 plants differ in their carbon fixation strategies?
C3 plants and C4 plants both use the Calvin cycle in mesophyll cells for carbon fixation
C3 plants fix carbon using PEP carboxylase in bundle sheath cells, while C4 plants use the Calvin cycle in mesophyll cells
C3 plants use the Calvin cycle in bundle sheath cells, while C4 plants use it in mesophyll cells
C3 plants use the Calvin cycle in mesophyll cells, while C4 plants initially fix carbon using PEP carboxylase in mesophyll cells before using the Calvin cycle in bundle sheath cells.
- 7. Multiple Choice
What is the significance of the Kranz anatomy in C4 plants?
Enhanced photosynthetic efficiency
Reduced water loss
Increased root growth
Enhanced seed dispersal
- 8. Multiple Choice
Compare the efficiency of C3 and C4 photosynthesis in hot and dry conditions.
C3 plants are more efficient than C4 plants in hot and dry conditions.
C4 plants are less efficient than C3 plants in hot and dry conditions.
C4 plants are more efficient than C3 plants in hot and dry conditions.
Both C3 and C4 plants have equal efficiency in hot and dry conditions.
- 9. Multiple Choice
How do C4 plants minimize photorespiration compared to C3 plants?
By decreasing the CO2 concentration in the cells
By reducing the efficiency of the Calvin cycle
By increasing the rate of photorespiration
By spatially separating initial CO2 fixation from the Calvin cycle in different types of cells.
- 10. Multiple Choice
Discuss the evolutionary advantages of C4 photosynthesis in certain plant species.
C4 photosynthesis is only advantageous in cold and wet environments
C4 photosynthesis provides more efficient carbon fixation in hot and dry conditions by reducing photorespiration and water loss.
C4 photosynthesis is less efficient than C3 photosynthesis in all conditions
C4 photosynthesis leads to increased water loss in plants
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