Photorespiration quiz Flashcards

Photorespiration is a process that wastes ATP and NADPH and produces carbon dioxide, causing the plant to lose carbon. Plants want to avoid it because it is inefficient compared to the Calvin cycle, which produces glucose.

Photorespiration is more likely to occur when the stomata are closed and oxygen gas concentrations within the plant are high.

When the stomata are open and carbon dioxide concentrations are high, the Calvin cycle occurs as Rubisco binds carbon dioxide with RuBP to produce glucose.

High oxygen concentration is a problem because Rubisco may bind oxygen instead of carbon dioxide, leading to photorespiration instead of the Calvin cycle.

Rubisco binds carbon dioxide with RuBP to initiate the Calvin cycle, leading to the production of glucose.

When the stomata remain closed, oxygen cannot leave and carbon dioxide cannot enter, leading to increased oxygen concentration and the likelihood of photorespiration.

Photorespiration wastes ATP and NADPH, which are crucial for the plant's energy and metabolic processes.

The primary product of the Calvin cycle is glucose.

Rubisco binds to oxygen instead of carbon dioxide when oxygen concentrations are high and carbon dioxide concentrations are low, leading to photorespiration.

The initial step of the Calvin cycle is the binding of carbon dioxide to RuBP by the enzyme Rubisco.

When the stomata are closed, the oxygen produced during the light reactions cannot leave the plant, leading to increased internal oxygen concentration.

Photorespiration and the Calvin cycle are competing processes; photorespiration is wasteful, while the Calvin cycle is productive in terms of glucose synthesis.

The closure of stomata reduces carbon dioxide availability, hindering the Calvin cycle and increasing the likelihood of photorespiration.