A.) If a leaf were to close its stomata during the day, and photosynthesis kept

Question

A.) If a leaf were to close its stomata during the day, and photosynthesis kept going, what would happen to the oxygen and carbon dioxide levels inside the leaf.

B.) What type(s) of adaptations are used by plants to concentrate carbon dioxide?

C.) Where does PEP carboxylase fix carbon dioxide?

D.) Explain why a C4 plant uses Rubisco, and in which cells would you expect to find Rubisco

E.) What is the difference between a C3 and C4 pathway?

F.) Explain the costs and benefits of a C4 pathway.

G.) Explain the costs and benefits of a CAM plant.

H.) With rising CO2 levels in the atmosphere, how would this affect C4 and C3 plants?

I.) What is the difference between the stroma and the stomata?

Explanation / Answer

A). Stomata are the minutes pores on the leaf that allow the exchange of gases in plants. CO2 goes inside and O2 come out of plant as by-product of photosynthesis. Photosynthesis take place in two steps- Light reaction and Dark Reaction. Light Reaction take place in the presence of sunlight and release of oxygen take place in this step. The release of oxygen takes place through stomata. So if the stomata are closed during the day, O2 formed in light reaction will not released and it will effect the rate of photosynthesis as excess of Oxygen will not favour the photosynthesis.

B) Plants utilize Phosphoenolpyruvate carboxylase (PEPC) enzyme which is more selective for CO2 and faster than  RuBisCO. The enzyme catalyzes the combination of CO2 with Phosphoenolpyruvate (PEP)), forming oxaloacetate which avoids photorespiration. This helps plants to survive in dry and hot environments, wherein stomata are closed and internal carbon dioxide levels are low.

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