Does photorespiration occur when the stomata is open?

When a plant has its stomata, or leaf pores, open CO2​start text, C, O, end text, start subscript, 2, end subscript diffuses in, O2​start text, O, end text, start subscript, 2, end subscript and water vapor diffuse out, and photorespiration is minimized.

Does photorespiration occur when stomata are closed?

Why does photorespiration happen? If it is too hot or dry, plants often close their stomata to prevent water loss. This prevents CO2 from entering the leaf, as well as prevents O2 from exiting. Oxygen builds up inside the leaf and photorespiration happens instead of the Calvin cycle.

Does photorespiration occur in C3 plants?

Photorespiration happens in C3 plants when the CO2 concentration drops to about 50 ppm. The key enzyme that accomplishes the fixing of carbon is rubisco, and at low concentrations of CO2 it begins to fix oxygen instead.

What happens when stomata closes in C3 plants?

When the stomata are closed, carbon dioxide can not enter the leaf and oxygen can not leave the leaf. Oxygen competes with carbon dioxide in The Calvin Cycle. When too much oxygen is inside the leaf, it will bind with RUBISCO (aka ribulose biphosphatase) and shut down the Calvin Cycle.

Under what conditions does photorespiration occur?

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

How do C3 plants avoid photorespiration?

C3 carbon fixing plants are adapted to environments where they are able to keep their stomata open long enough during the day so natural circulation of gases keeps concentrations of CO2 and O2 in the leaf at proportions where photorespiration is less compromising and productivity is sufficient.

When and why does photorespiration take place in plants?

Photorespiration takes place in greenplants at the same time that photosynthesis does. Because in photosynthesis carbon dioxide is taken in, and in photorespiration carbon dioxide is given off, these two processes work against each other.

Why is photorespiration more of a problem for a C3 plant when its stomata are closed quizlet?

Why is photorespiration more of a problem for a plant when their stomata are closed? Glucose cannot leave through the stomata and levels increase inside of the plant cell, causing dehydration by osmosis. Oxygen levels increase from photosynthesis and compete with carbon dioxide for rubisco’s active site.

How does photorespiration occur in plants?

Hint: Photorespiration is a process that involves the loss of fixed carbon as CO2 in plants in the presence of light. It is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. Photorespiration occurs usually when there is a high concentration of oxygen.

How does photorespiration occur?

Photorespiration involves a complex network of enzyme reactions that exchange metabolites between chloroplasts, leaf peroxisomes and mitochondria. 2 and nitrogen, as ammonia. Ammonia must then be detoxified at a substantial cost to the cell. Photorespiration also incurs a direct cost of one ATP and one NAD(P)H.

Where does photorespiration occur in plants?

photorespiration A light-activated type of respiration that occurs in the chloroplasts of many plants.