In C3 plants (see C3 pathway), photorespiration has the effect of reducing the rate of photosynthesis because atmospheric oxygen can bind to rubisco.In C4 plants (see C4 pathway), the effect of photorespiration is negligible Because phosphoenolpyruvate carboxylase has a very high affinity for carbon dioxide.

Why is photorespiration almost negligible in C4 plants?

Photorespiration occurs due to the oxygenase activity of RuBisCO. When the O2 concentration is high, RuBisCO combines with oxygen and performs photorespiration. C4 plants have Mechanisms for maintaining high CO2 concentrations at enzyme sitesso photorespiration does not occur.

Why does C4 not have photorespiration?

C4 plants do not undergo photorespiration.This is because they Has a mechanism to increase the CO2 concentration at the enzyme site. This occurs when mesophyll C4 acids are broken down in bundle sheath cells to release CO2, which results in increased intracellular CO2 concentration.

Why do C4 and CAM plants not perform photorespiration?

By concentrating CO2 in bundle sheath cells, C4 plants Promote efficient operation of the Calvin-Benson cycle And minimize photorespiration. … However, instead of fixing carbon during the day and pumping OAA into other cells, CAM plants fix carbon at night and store OAA in large intracellular vacuoles.

What is the reason for the existence of photorespiration in C4 plants?

Photorespiration rates increase at higher temperatures, lower CO2, and higher O2 concentrations. … in C4 plants, photorespiration does not occur because they have A mechanism evolved to increase CO2 concentration around the enzyme RuBisCO in bundle sheath cells.

C3 and C4 Plants – Photorespiration – Post 16 Biology (A Level, Pre-U, IB, K-12)

40 related questions found

What is the purpose of the C4 factory?

1: Design of the C4 channel C4 channel Effectively fix low concentrations of carbon dioxide Plants that use this pathway are called C4 plants. These plants fix CO2 into a four-carbon compound called oxaloacetate (C4). This happens in cells called mesophyll cells.

Why is it called the C4 pathway?

In the C4 pathway, Initial carbon fixation occurs in mesophyll cells The Calvin cycle occurs in bundle sheath cells. PEP carboxylase links incoming carbon dioxide molecules to the three-carbon molecule PEP, producing oxaloacetate (a four-carbon molecule).

What is the difference between a C4 and a CAM factory?

The main difference between C4 and CAM plants is The way they minimize water loss. C4 plants relocate carbon dioxide molecules to minimize photorespiration, while CAM plants choose when to extract carbon dioxide from the environment. … they collect carbon dioxide at night when the environment is much cooler and store the concentrated carbon dioxide as malate.

What are the similarities and differences between C3 C4 and CAM factory?

The main difference between C3 C4 and CAM photosynthesis is that C3 photosynthesis produces three-carbon compounds via the Calvin cycleand C4 photosynthesis produces intermediate four-carbon compounds, which split into three-carbon compounds in the Calvin cycle, while CAM photosynthesis in…

What is the difference between C3 C4 and CAM plants?

C3 photosynthesis produces three-carbon compounds through the Calvin cycle, while C4 photosynthesis produces Intermediate four carbon compounds Split into three-carbon compounds of the Calvin cycle. Plants using CAM photosynthesis collect sunlight during the day and fix carbon dioxide molecules at night.

Do C4 plants use Rubisco?

C4 plants use this 4-carbon compound effectively « Concentrating » CO2 around rubisco, so that rubisco is unlikely to re-react with O2. There are two important adaptations that enable C4 plants to do this: … Rubisco is located in bundle sheath cells, but not in mesophyll cells.

Is photorespiration good or bad?

photorespiration Bad for C3 Because this process leads to a decrease in the productivity of the plant, it is also known as the waste process. Photorespiration is a respiration process in many higher plants.

Which is not a C4 factory?

Which one is not a C4 factory and which one is not a C4 factory? a) Sugarcane. … beekeeping is related to flora …

Do C4 plants have photorespiration?

This pathway is called photorespiration. During photorespiration, no sugar or ATP molecules are synthesized, only carbon dioxide is released, and ATP is consumed, and the whole process is futile. However, C4 plants do not perform photorespiration Its specific mechanism increases the level of CO2 bound by the enzyme.

Is sugarcane a C4 plant?

C4 plants – including corn, sugarcane and sorghum – avoid photorespiration by using another enzyme called PEP​​ in the first step of carbon fixation.

Which is better C3 or C4 plant?

The optimum temperature for photosynthesis is higher. C3 plants are less efficient at photosynthesis. C4 plants are more efficient photosynthesis. The photorespiration rate is very high.

What is the difference between the C3 and C4 pathways?

C3 plants are defined as plants exhibiting the C3 pathway. These plants use the Calvin cycle in the dark reaction of photosynthesis. …on the other hand, C4 plants are defined as using the C4 pathway or Hatch-slack pathway during the dark reaction.

What is an example of a C4 factory?

Examples of C4 plants include Corn, sorghum, sugar cane, millet and switchgrass… In contrast, the adaptive capacity of C4 plants is not limited by carbon dioxide, and in the presence of elevated carbon dioxide levels, C4 plants do not grow as much as C3 plants.

Why are C4 plants more efficient at high temperatures?

C4 plants are more efficient than C3 Reduced photorespiration rate due to their high rate of photosynthesis…when carbon dioxide concentration is low, RuBisCO absorbs oxygen for photorespiration.

Why are C4 plants more expensive than C3 plants?

Photosynthesis in higher plants. How is the C4 route more expensive than the C3? The C3 cycle requires 18 ATP molecules to synthesize one molecule of glucose, while the C4 cycle requires 30 ATP molecules.expired High energy demand C4 cycle More energy-intensive than the C3 cycle.

Why is the C4 loop important?

When the stomata are open, CO2 can diffuse in for photosynthesis, and O2 can diffuse out, the products of photosynthesis. …plants that do C4 photosynthesis keep their stomata closed better than their C3 equivalents because they have more Efficient Incorporating carbon dioxide. This minimizes their water loss.

Who gave C4 the loop?

Calvin Cycle’ the classical pathway of photosynthesis

In the 1950s, Calvin Using C14 radiolabeled carbon dioxide, and his colleagues elucidated the main reaction in the green alga Chlorella algae to synthesize glucose from carbon dioxide and water using light energy.

What is another name for the C4 loop?

The C4 pathway cycle is part of the biosynthetic process and it occurs before the C3 cycle.This process is also called Hatch and Slack paths. The first stable product of the process is a four-carbon compound (oxaloacetate), hence the name.