What is photorespiration and why is it detrimental for plants?

What is photorespiration and why is it detrimental for plants?

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.

Is photorespiration harmful to plants?

Photorespiration is bad for C3 plants because this process causes a decrease in the productivity of a plant, hence it is also called the wasteful process. Photorespiration is a respiratory process in many higher plants. This is also known as the oxidative photosynthetic, or C2 photosynthesis or carbon cycle.

Is photorespiration beneficial or harmful to plants and why?

Photorespiration is either a necessary evil of plant metabolism or it may have some adaptive function that is not apparent. Some have proposed that photorespiration allows plant leaves to use up excess light energy and reduce photooxidative damage when the plant is water-stressed and the stomata are closed.

Why is photorespiration a problem for photosynthesis?

Because carbon is oxidized, the process is termed photorespiration. Photorespiration reduces the efficiency of photosynthesis for a couple of reasons. First, oxygen is added to carbon. In other words, the carbon is oxidized, which is the reverse of photosynthesis—the reduction of carbon to carbohydrate.

What is photorespiration Why is it considered as a harmful process?

Photorespiration consumes ATP and NADPH, the high-energy molecules made by the light reactions and therefore prevents their utilization in the synthesis of carbohydrates. Therefore, it is a wasteful pathway that competes with the Calvin cycle and is considered a destructive activity.

What is photorespiration and how it can affect photosynthesis process?

Photorespiration is the chemical processes that occur within a living organism of phosphoglycolate that is produced during oxygenation catalyzed by the enzyme RubisCO and inhibits photosynthesis by interfering with CO2 fixation by RubisCO.

What are the problems of photorespiration?

The problem of photorespiration is overcome in C4 plants by a two-stage strategy that keeps CO2 high and oxygen low in the chloroplast where the Calvin cycle operates. The class of plants called C3-C4 intermediates and the CAM plants also have better strategies than C3 plants for the avoidance of photorespiration.

What is photorespiration Why is it a wasteful process?

In the photoresspiratory pathway, there is neither synthesis of sugars nor of ATP Rather , it results in the release of CO2 with the utilization of ATP Therefore, photorespirtion is a wasteful process.

Why is photorespiration considered wasteful quizlet?

Photorespiration Decreases the Efficiency of Photosynthesis: why is photorespiration considered wasteful? because it releases CO2, thereby limiting plant growth. when plants are exposed to a hot and dry environment.

What are the disadvantages of photorespiration?

Disadvantages of photorespiration in plants:

  • It is the reverse of photosynthesis.
  • It reduces the effectiveness of photosynthesis.
  • It is a wasteful process, as it does not produce ATP or NADPH.

Why photorespiration is wasteful process?

Because it produces 2PG, a compound “toxic” to many enzymes in photosynthetic metabolism, and oxidizes organic carbon without seemingly generating ATP, photorespiration is generally considered a wasteful process.

Which is a wasteful process in plants?

In the photorespiratory pathway there is no synthesis of ATP or NADPH. Therefore, photorespiration is a wasteful process.

Why Photorespiration is a wasteful process?

Why does Photorespiration reduce the efficiency of photosynthesis?

Photorespiration lowers the efficiency of photosynthesis by preventing the formation of. ATP molecules.

What are the consequences of photorespiration?

Photorespiration results in a loss of 3 fixed carbon atoms under these conditions, while the Calvin cycle results in a gain of 6 fixed carbon atoms.

Why is photorespiration is a wasteful process?

Why is photorespiration considered as harmful process?

What are the end products of photorespiration?

The end product of photorespiration i.e., carbon dioxide is then utilised by the Calvin cycle to complete the photosynthesis.

What happens to photorespiration when a plant closes its stomata?

However, when a plant closes its stomata—for instance, to reduce water loss by evaporation— from photosynthesis builds up inside the leaf. Under these conditions, photorespiration increases due to the higher ratio of to .

How does photorespiration affect the rate of photosynthesis?

The end result is that photorespiration decreases the net amount of carbon dioxide which is converted into sugars by a photosynthesizing plant. By interfering with photosynthesis in this way, photorespiration may significantly limit the growth rate of some plants.

What is produced during photorespiration in plants?

Photorespiration results in the light-dependent uptake of oxygen and release of carbon dioxide and is associated with the synthesis and metabolism of a small molecule called glycolate. Photorespiration takes place in green plants at the same time that photosynthesis does.

When does photorespiration occur in a leaf drop?

When the carbon dioxide proportions inside a leaf drop photorespiration takes place. This takes place mostly on warm arid days when plants are compelled to shut their stomata to avert surplus water loss.

Related Post