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What is photorespiration?
Photorespiration is a process in plants that occurs when rubisco, the enzyme responsible for carbon fixation, uses oxygen instead of carbon dioxide. This can happen in hot or dry conditions, leading to a wasteful process that reduces the efficiency of photosynthesis. Photorespiration can lower the productivity of plants.
In which cell would you expect photorespiration?
Photorespiration typically occurs in mesophyll cells of plant leaves, where the enzyme rubisco can mistakenly use oxygen instead of carbon dioxide for the initial steps of photosynthesis.
What is the name of the process wherein co2 is released without the production of atp or nadph?
The process you are referring to is called photorespiration. It is a metabolic pathway that releases CO2 without producing ATP or NADPH and occurs in plants when the Calvin cycle is inhibited.
In excess of oxygen the enzyme Rubisco participates in?
In excess of oxygen, the enzyme Rubisco participates in a process called photorespiration. This process occurs when oxygen outcompetes carbon dioxide as a substrate for Rubisco, leading to a series of reactions that reduce the efficiency of photosynthesis. Photorespiration happens in plants to mitigate the effects of high oxygen levels, particularly under conditions like high temperatures or drought stress.
What is the difference between photorespiration and respiration?
photorespiration: RuBP accepts oxygen instead of CO2 during photosynthesis because production of oxygen has exceeded production of CO2. respiration: Oxygen is produced in oxidative phosphorylation/chemisosmosis and used to produce water during respiration.
Does photorespiration produce energy?
No, photorespiration does not produce energy. In fact, it is considered a wasteful process that occurs in plants when there is a lack of carbon dioxide and excess oxygen in the leaf cells. Photorespiration can decrease the efficiency of photosynthesis in plants.
What is photorespiration?
Photorespiration is a process in plants that occurs when rubisco, the enzyme responsible for carbon fixation, uses oxygen instead of carbon dioxide. This can happen in hot or dry conditions, leading to a wasteful process that reduces the efficiency of photosynthesis. Photorespiration can lower the productivity of plants.
Can tomato plants show photo respiration?
No, tomato plants do not undergo photorespiration. Photorespiration is a process that occurs in C3 plants, where oxygen is mistakenly used instead of carbon dioxide in the initial steps of photosynthesis. However, tomato plants are classified as C4 plants, which have evolved mechanisms to minimize photorespiration.
What happens during photorespiration?
In photorespiration, O2 replaces CO2 in a non-productive, wasteful reaction. Photorespiration occurs when the CO2 levels inside a leaf become low, which happens on hot dry days when a plant is forced to close its stomata to prevent excess water loss.
Is photorespiration independent of light intensity?
Photorespiration is not independent of light intensity; it is suppressed at high light intensity due to the greater availability of CO2 for photosynthesis. Under low light conditions, photorespiration can become more prevalent as there is a higher ratio of oxygen to CO2 in the leaf, leading to increased oxygenation of ribulose bisphosphate.
In which cell would you expect photorespiration?
Photorespiration typically occurs in mesophyll cells of plant leaves, where the enzyme rubisco can mistakenly use oxygen instead of carbon dioxide for the initial steps of photosynthesis.
What is the name of the process wherein co2 is released without the production of atp or nadph?
The process you are referring to is called photorespiration. It is a metabolic pathway that releases CO2 without producing ATP or NADPH and occurs in plants when the Calvin cycle is inhibited.
Where is Photorespiration located?
Photorespiration involves three different organelles--- chloroplasts, peroxisomes and mitochondria
Why is photorespiration wastful process?
Photorespiration is considered wasteful because it consumes energy and resources without producing useful compounds for the plant. It occurs when rubisco enzyme fixes oxygen instead of carbon dioxide, leading to the release of CO2 and consumption of ATP and reducing power. This process reduces the efficiency of photosynthesis and can limit plant growth in certain conditions.
What happens when RuBP reacts with O2?
When RuBP reacts with O2 instead of CO2 in the Calvin cycle, a process known as photorespiration occurs. This results in the synthesis of a compound that can't be used to produce glucose, wasting energy and decreasing the efficiency of photosynthesis.
Why doesn't photorespiration occur in chemoautotrophs?
Photorespiration occurs in plants because they use oxygen in the Calvin cycle, leading to the wasteful process. Chemoautotrophs do not utilize the Calvin cycle for carbon fixation; instead, they use alternative pathways like the reductive tricarboxylic acid cycle or the 3-hydroxypropionate bi-cycle. This means that they do not produce the same conditions that lead to photorespiration as seen in plants.
What is photorespiration and Explain how some species of plants cope with this condition C4 and CAM?
Photorespiration is a process of metabolic pathway that consumes oxygen, releases carbon dioxide, generates no ATP, and decreases photosynthetic output; generally occurs on hot, dry, bright days, when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide. Photorespiration occurs because Rubisco can utilize O2 as a substrate instead of CO2. It means when stomata partially close on hot day, dry day, CO2 levels drop as CO­2 is consumed in the Calvin cycle. At the same time, O2 levels rise as the light reaction converts light to chemical energy. When the O­­2:CO2 ratio increase, there is not enough CO­2 and rubisco can add O2 to Calvin cycle (RuBP). Therefore, photorespiration consumes O2 and organic fuel and releases CO2 without producing ATP or sugar. Photorespiration reduces net C fixation considerably. Photorespiration also uses ATP & NADPH. Photorespiration is a process of metabolic pathway that consumes oxygen, releases carbon dioxide, generates no ATP, and decreases photosynthetic output; generally occurs on hot, dry, bright days, when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide. Photorespiration occurs because Rubisco can utilize O2 as a substrate instead of CO2. It means when stomata partially close on hot day, dry day, CO2 levels drop as CO­2 is consumed in the Calvin cycle. At the same time, O2 levels rise as the light reaction converts light to chemical energy. When the O­­2:CO2 ratio increase, there is not enough CO­2 and rubisco can add O2 to Calvin cycle (RuBP). Therefore, photorespiration consumes O2 and organic fuel and releases CO2 without producing ATP or sugar. Photorespiration reduces net C fixation considerably. Photorespiration also uses ATP & NADPH.
