What is Photorespiration explain?
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 Photorespiration and why does it occur?
Photorespiration is a metabolic pathway that occurs in photosynthetic organisms and releases carbon dioxide, consumes oxygen, and produces no chemical energy or food. This process limits the growth rates of plants.
What is Photorespiration quizlet Chapter 7?
Photorespiration is an inefficient process that occurs when plants close their stomata to avoid dehydration in arid climates.
What is Photorespiration Class 11?
Photorespiration is a process that lowers the efficiency of photosynthesis in plants. In these plants, oxygen binds with RuBisCo during photosynthesis, which results in reduced carbon dioxide fixation. Additionally, this process does not result in the synthesis of sugars nor of ATP or NADPH.
What is the purpose of Photorespiration?
Photorespiration is the oxygenation of RuBP by RUBISCO followed by photorespiratory glycolate metabolism. Competition between O2 and CO2 reduces the rate of carbon assimilation, energetic efficiency of photosynthesis, and may reduce the photosynthetic quotient (PQ = O2 evolved/CO2 assimilated).
Is Photorespiration good or bad?
A new study suggests that photorespiration wastes little energy and instead enhances nitrate assimilation, the process that converts nitrate absorbed from the soil into protein. Photosynthesis is one of the most crucial life processes on Earth.
What is the site of Photorespiration?
photorespiration A light-activated type of respiration that occurs in the chloroplasts of many plants.
Where does Photorespiration occur?
Therefore, photorespiration is a wasteful process. This pathway occurs in three cell organelles- chloroplast, peroxisomes and mitochondria.
What is the end product of Photorespiration?
The end product of photorespiration i.e., carbon dioxide is then utilised by the Calvin cycle to complete the photosynthesis.
What is the role of photorespiration in plants quizlet?
A metabolic pathway that consumes oxygen and ATP, releases carbon dioxide, and decreases photosynthetic output. Photorespiration generally occurs on hot, dry, bright days, when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide.
What connects the two photosystems in the light reactions?
What connects the two photosystems in the light reactions? An electron transport chain connects the two photosystems in the light reactions.
Which of the following is an example of a Photoautotroph?
Green plants and photosynthetic bacteria are examples of photoautotrophs. They are not to be confused with photoheterotrophs, which also make energy from light but cannot use carbon dioxide as their sole source of carbon, and instead use organic materials.
Why is Photorespiration a wasteful process Class 11?
Solution: Photorespiration is considered as a highly wasteful process because it does not produce energy for reducing power. On the other hand, it consumes energy and loses about 25% fixed O2.
Why there is no Photorespiration in C4 plants?
In C4 plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of CO2 at the enzyme site and due to the kranz anatomy. The mesophyll cells lacks RuBisCo enzyme. The malic acid from the mesophyll is broken down in the bundle sheath cells to release CO2.
Do C4 and CAM plants Photorespiration?
By concentrating CO 2 in the bundle sheath cells, C4 plants promote the efficient operation of the Calvin-Benson cycle and minimize photorespiration. However, instead of fixing carbon during the day and pumping the OAA to other cells, CAM plants fix carbon at night and store the OAA in large vacuoles within the cell.