PHOTOSYNTHESIS
C 4 PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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stores CO2 in a separate cell from its photosynthetic cell during the day
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stores CO2 in a vacuole during the night.
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can’t store CO2 so it sufferes photorespiration
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can’t store CO2 so it speeds up cellular respiration in order to make more CO2
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Detailed explanation-1: -In C4 photosynthesis, where a four-carbon compound is produced, unique leaf anatomy allows carbon dioxide to concentrate in ‘bundle sheath’ cells around Rubisco. This structure delivers carbon dioxide straight to Rubisco, effectively removing its contact with oxygen and the need for photorespiration.
Detailed explanation-2: -The CAM pathway Like C4 plants, the use PEP carboxylase to fix CO2, forming oxaloacetate. The oxaloacetate is converted to malate which is stored in cell vacuoles. During the day when the stomata are closed, CO2 is removed from the stored malate and enters the Calvin cycle.
Detailed explanation-3: -A unique leaf anatomy and biochemistry enables C4 plants to bind carbon dioxide when it enters the leaf and produces a 4-carbon compound that transfers and concentrates carbon dioxide in specific cells around the Rubisco enzyme, significantly improving the plant’s photosynthetic and water use efficiency.
Detailed explanation-4: -The C4 pathway acts as a mechanism to build up high concentrations of carbon dioxide in the chloroplasts of the bundle sheath cells.
Detailed explanation-5: -C4 plants overcome photorespiratory losses by having the mechanism that increases the concentration of CO2 at the enzyme site. During the C4 pathway, when the C4 acid from the mesophyll cells is broken down in the bundle sheath cells, it releases CO2 this results in increasing the intracellular concentration of CO2.