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photorespiration
This term is a specialized technical descriptor used almost exclusively within the fields of botany, plant physiology, and biochemistry. It describes a wasteful process that competes with photosynthesis, often viewed as an evolutionary inefficiency of the enzyme Rubisco. Because it is a specific biochemical pathway, it is used in a clinical or academic register rather than in general conversation.
As a technical term for a biological process, it is an uncountable noun. It refers to the phenomenon as a whole rather than individual instances of the process, meaning it does not take a plural form in standard scientific writing.
Meanings
A metabolic process in plants where the enzyme Rubisco oxygenates ribulose-1,5-bisphosphate instead of carboxylating it, leading to the consumption of oxygen and the release of carbon dioxide without the production of ATP or sugar.
The efficiency of C3 plants is significantly reduced by photorespiration during hot and dry conditions.