Does photorespiration depends upon the intensity of light?if it does then then what is rate of photorespiration in C3 and C4 plants?

Question

Answer

There is no photorespiration in c4 plants and when light intensity is very high phototespiration takes place in c3 plants as stomata get closed at very high light intensity and hence there is no co2 for RUBicso to bind hence it bind with o2 and perform photoresporation.

Answer

Yes it depends upon intensity of light !!!!  high light  intensity is major factor for photorespiration!!! rate of photorespiration is 0 in C4 and high in c3 when co2 conc. is low in stroma of cloroplast.!!

Answer

Photorespiration is negligible or absent in C4 plants while the photorespiration rate is high in C3 plants

Answer

In photorespiration, RuBisCO binds to O2 instead of CO2.. nd it's the relative conc of O2 nd CO2 tht determines rate of photorespiration.. it  occurs generally in C3 plants..but not in C4 plants bcs they hv mechanism to increase conc of CO2 in bundle sheath cells..

Answer

Does photorespiration depend on the intensity of light?
Yes, photorespiration does depend on the intensity of light. Photorespiration is a process that occurs in plants when there is a shortage of carbon dioxide (CO2) and an excess of oxygen (O2) in the leaf cells. It is a wasteful process that competes with photosynthesis and reduces the efficiency of carbon fixation. The intensity of light affects the rate of photosynthesis and, consequently, the availability of CO2 and O2 in the leaf cells, thus influencing the rate of photorespiration.

Rate of photorespiration in C3 plants:
C3 plants are the most common type of plants, and they include many crops such as rice, wheat, and soybeans. In C3 plants, photorespiration is more prominent because the enzyme responsible for capturing CO2 during photosynthesis (rubisco) also has a tendency to capture O2. Under low light conditions, the rate of photosynthesis is low, resulting in a higher ratio of O2 to CO2. This leads to an increased rate of photorespiration in C3 plants.

Rate of photorespiration in C4 plants:
C4 plants have evolved a mechanism to minimize photorespiration. They have an additional biochemical pathway that concentrates CO2 around the rubisco enzyme, reducing the chance of capturing O2. This adaptation allows C4 plants to thrive in high light and high-temperature conditions. The rate of photorespiration is significantly lower in C4 plants compared to C3 plants.

Explanation:
- In C3 plants, the rate of photorespiration is influenced by the light intensity. Under high light conditions, the rate of photosynthesis increases, leading to a lower ratio of O2 to CO2. This reduces the occurrence of photorespiration.
- On the other hand, under low light conditions, the rate of photosynthesis is low, resulting in a higher ratio of O2 to CO2. This increases the rate of photorespiration in C3 plants.
- C4 plants, such as corn and sugarcane, have evolved a specialized pathway to minimize photorespiration. They have an additional set of cells called bundle sheath cells, where CO2 is concentrated before entering the photosynthetic cells. This spatial separation of CO2 and rubisco reduces the chances of rubisco capturing O2, thus minimizing photorespiration.
- The rate of photorespiration in C4 plants is significantly lower compared to C3 plants, especially in high light and high-temperature conditions.
- The efficiency of C4 plants in reducing photorespiration allows them to have higher photosynthetic rates and better water-use efficiency compared to C3 plants in certain environments.

In summary, photorespiration does depend on the intensity of light. Under low light conditions, the rate of photorespiration is higher in C3 plants due to a higher ratio of O2 to CO2. However, C4 plants have evolved a specialized mechanism to minimize photorespiration, resulting in lower rates compared to C3 plants, especially in high light and high-temperature conditions.

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