What is Photorespiration explain?
Hint: Photorespiration is a process which involves loss of fixed carbon as CO2, in plants in the presence of light it is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. Complete answer: Photorespiration occurs usually when there is high concentration of oxygen.
What is Photorespiration and why is it a problem?
Biochemical studies indicate that photorespiration consumes ATP and NADPH, the high-energy molecules made by the light reactions. Thus, photorespiration is a wasteful process because it prevents plants from using their ATP and NADPH to synthesize carbohydrates.
What is the purpose of Photorespiration?
Photorespiration (also known as the oxidative photosynthetic carbon cycle, or C2 photosynthesis) refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
What is the difference between photorespiration and photosynthesis?
The main difference between photosynthesis and photorespiration is that the photosynthesis occurs when RuBisCO enzyme reacts with carbon dioxide while the photorespiration occurs when RuBisCO enzyme reacts with oxygen. Furthermore, photorespiration reduces the efficiency of photosynthesis.
What Photorespiration consumes?
The reaction of RUBISCO with oxygen and metabolic processing of the resulting 2-PG is called “photorespiration“. It is called this because it only occurs in the light (mitochondrial respiration continues in darkness) and because it consumes oxygen and produces carbon dioxide, just like mitochondrial respiration.
Where does Photorespiration occur?
photorespiration A light-activated type of respiration that occurs in the chloroplasts of many plants. It differs biochemically from normal (dark) respiration in that it involves glycolate metabolism (see GLYCOLATE CYCLE).
What are the major consequences of Photorespiration?
Describe the major consequences of photorespiration. It generates no ATP, it consumes ATP. It produces no sugar. It counteracts what normal plants do.
Why does Photorespiration increase with temperature?
The decrease in photosynthesis rate, or rise in photorespiration, as temperature increases is due to an increase in the affinity of rubisco and oxygen. Rubisco combines more with oxygen relative to carbon dioxide as temperature rises, which slows the rate of photosynthesis.
Why is Photorespiration called C2 cycle?
Photorespiration is also called the C2 cycle because the first main product formed is phosphoglycolate which is a 2 carbon molecule. Phosphoglycolate is later converted to glycolate. This process of photorespiration converts the sugar phosphates back to carbon dioxide.
How can Photorespiration be prevented?
Some plants that are adapted to dry environments, such as cacti and pineapples, use the crassulacean acid metabolism (CAM) pathway to minimize photorespiration. This name comes from the family of plants, the Crassulaceae, in which scientists first discovered the pathway.
Does Photorespiration produce sugar?
Photorespiration is a process which involves loss of fixed carbon as CO2 in plants in the presence of light. It is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. It does not even produce any sugar.
What is the end product of Photorespiration?
It occurs when CO2 concentration is low inside the leaf. Thus, RuBisCO acts on oxygen instead of carbon dioxide and produces energy and carbon dioxide. The end product of photorespiration i.e., carbon dioxide is then utilised by the Calvin cycle to complete the photosynthesis.
Is Photorespiration good or bad?
However, it may have other benefits for plants. There’s some evidence that photorespiration can have photoprotective effects (preventing light-induced damage to the molecules involved in photosynthesis), help maintain redox balance in cells, and support plant immune defenses 8start superscript, 8, end superscript.
How does Photorespiration affect photosynthesis?
Photorespiration reduces the efficiency of photosynthesis for a couple of reasons. In other words, the carbon is oxidized, which is the reverse of photosynthesis—the reduction of carbon to carbohydrate. Secondly, it is now necessary to resynthesize the ribulose bisphosphate and to reduce the phosphoglycolate.
What happens when a plant undergoes Photorespiration?
What happens when a plant undergoes photorespiration? During photorespiration, which is a metabolic process, the plant consumes oxygen and ATP, releases carbon dioxide, and decreases photosynthetic output.