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HomeHomework HelpbiologyPhotorespiration

Photorespiration

Photorespiration is a metabolic process in plants that occurs when the enzyme ribulose bisphosphate carboxylase/oxygenase (RuBisCO) catalyzes the reaction of ribulose bisphosphate with oxygen instead of carbon dioxide, leading to the production of a two-carbon compound and a decrease in photosynthetic efficiency. This process typically occurs under conditions of high oxygen concentration and low carbon dioxide availability, resulting in the release of carbon dioxide and the consumption of energy.

intermediate
2 hours
Biology
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Overview

Photorespiration is a crucial process in plants that can significantly impact their growth and productivity. It occurs when the enzyme RuBisCO reacts with oxygen instead of carbon dioxide, leading to the release of carbon dioxide and a decrease in photosynthetic efficiency. This process is more prev...

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Key Terms

Photorespiration
A process in plants where oxygen is consumed and carbon dioxide is released, reducing photosynthetic efficiency.

Example: During hot days, plants may undergo photorespiration, leading to lower sugar production.

RuBisCO
An enzyme that catalyzes the first step of carbon fixation in photosynthesis.

Example: RuBisCO can also react with oxygen, leading to photorespiration.

C3 Plants
Plants that use the C3 pathway for photosynthesis, which is less efficient under high temperatures.

Example: Wheat and rice are examples of C3 plants.

C4 Plants
Plants that have adapted to minimize photorespiration by using a different pathway for carbon fixation.

Example: Corn and sugarcane are C4 plants.

Stomata
Small openings on the surface of leaves that allow gas exchange.

Example: Stomata open to take in CO2 and close to prevent water loss.

Oxygenase Activity
The ability of RuBisCO to catalyze reactions with oxygen instead of carbon dioxide.

Example: High oxygenase activity can lead to increased photorespiration.

Related Topics

Photosynthesis
The process by which plants convert light energy into chemical energy.
intermediate
Plant Adaptations
How plants evolve to survive in various environments, including adaptations to minimize photorespiration.
intermediate
Climate Change Impact on Agriculture
Exploring how climate change affects crop yields and plant processes like photorespiration.
advanced

Key Concepts

C3 plantsOxygenase activityCarbon fixationEnvironmental impact