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The electron transport chain is a system of molecules through which electrons are transferred to generate ATP. It has an important role in both photosynthesis. Electron Transport in Photosynthesis. This is an active graphic. The above illustration draws from ideas in both Moore, et al. and Karp to outline the steps in the. Since they are light 'dependent' reactions, you can guess that these reactions need light to work. Remember that the purpose of this first part of photosynthesis is.
How are photosynthesis and photorespiration different…
Under moderate temperature conditions when C3 plants have sufficient water, the supply of carbon dioxide is abundant and photorespiration is not a problem. The CO2 concentration of the atmosphere as of 2004 was about 380 ppm and this CO2 freely diffuses through the stomata of leaves and across the membranes of the while water diffuses out through the stomata. But during hot and dry conditions, the stomata close to prevent excessive water loss and the continuing fixation of carbon in the dramatically reduces the relative concentration of CO2. When it reaches a critical level of about 50 ppm the rubisco stops fixing CO2 and begins to fix O2 instead. Even though the detoured process feeds some PGA back into the cycle, the photorespiration process causes rubisco to operate at only about 25% of its optimal rate.
The function of the ETC in photosynthesis in photosystem II and photosystem I is to produce NADPH and ATP “fuel” for glucose synthesis in. It's to TRANSPORT ELECTRONS. Hence the name. What's up with the caps? Photosynthesis is a fascinating process, by which energy from.
Photosynthesis takes place in the inner cells of C4 plants.
It would be helpful to include more detail in part B about the differences in the C3 and C4 or CAM plants. For example, you could have included the fact that, while CAM plants open their stomata at night, they store the CO2 they take in for it to be used during the day. Also, it would benefit your response to part C to explain why C4 and CAM plants undergo photorespiration, and why it occurs at a slower rate. For example, you could have mentioned that C4 and CAM plants use a different enzyme to aid in carbon fixation that the C3 plants, or you should have said that hot climates and closing their stomata at night can cause photorespiration to occur. But overall, your answers were correct!
What's the difference between C3, C4 and CAM plants?
A) C4 and CAM photosynthesis are considered to be coping mechanisms for plants found in dry, arid climates. Tiny openings called stomata are located on the surface of leaves. When surrounding guard cells allow these holes to open, CO2 enters and H2O evaporates. If the stomata of plants in arid climates opened during the day, the plant would dehydrate because the water would evaporate very quickly. For this to not happen, CAM plants only open their stomata at night and incorporate CO2 into organic acids. During the day, they close their stomata and the CO2 is released from the organic acids for use in the Calvin Cycle. Similarly, C4 plants also have to cope with arid climates. Their stomata open in the day, and they incorporate CO2 into four carbon compounds in mesophyll cells (three carbon compounds are the most common). Then, the 4C compounds are exported into a deeper layer of the leaf called bundle-sheath cells. Here, the CO2 used in the Calvin Cycle is released.
B) There are several differences in the process of photosynthesis within C3, C4, and CAM plants. For example, a three carbon compound is found in C3 plants, whereas C4 plants use a four carbon compound. Another difference is that C3 plants use only mesophyll cells for the light-dependent reactions, and C4 plants use both mesophyll cells and bundle-sheath cells for the reaction. Finally, C3 plants open their stomata during the day, and CAM plants open theirs during the night.
C) Photorespiration occurs when rubisco attaches to O2 instead of CO2. This is ultimately bad for plants because no ATP or sugar is produced, but it still requires ATP in order to undergo this process. Although C4 and CAM photosynthesis is different than C3 photosynthesis, it is still possible for them to go through photorespiration, but it occurs at a slower rate compared to C3 photorespiration.