AP BIOLOGY

Detailed explanation-1: -Photorespiration is a wasteful pathway that competes with the Calvin cycle. It begins when rubisco acts on oxygen instead of carbon dioxide.

Detailed explanation-2: -Photorespiration occurs usually when there is a high concentration of oxygen. Under such circumstances, RuBisCO, the enzyme that catalyzes the carboxylation of RuBP during the first step of the Calvin cycle, functions as an oxygenase. Some O2 does not bind itself to RuBisCO and hence CO2 fixation is decreased.

Detailed explanation-3: -Photorespiration is a wasteful pathway that occurs when the Calvin cycle enzyme rubisco acts on oxygen rather than carbon dioxide.

Detailed explanation-4: -Oxygen consumption by Rubisco occurs in the chlorophyll-containing organelle of plant cells. Complete answer: Photorespiration is a process that utilizes oxygen molecules and releases fixed carbon molecules. It occurs in the chlorophyll-containing organelle of plant cells called the chloroplast.

Detailed explanation-5: -Photosynthesis and photorespiration are two biological processes (in flourishing plants) that can function simultaneously beside each other as photosynthesis gives off oxygen as its byproduct and photorespiration gives off carbon dioxide as its byproduct, and the said gases are the raw material for the said processes.