Factors Affecting Photosynthesis (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What determines the overall rate of photosynthesis when multiple factors are limiting simultaneously?
What determines the overall rate of photosynthesis when multiple factors are limiting simultaneously?
The factor at its lowest value
Between 0°C and 25°C, how does photosynthetic rate change for every 10°C rise in temperature?
Between 0°C and 25°C, how does photosynthetic rate change for every 10°C rise in temperature?
Approximately doubles
Which stage of photosynthesis is primarily affected by temperature changes?
Which stage of photosynthesis is primarily affected by temperature changes?
Light-independent stage (Calvin cycle)
At low light intensities, how does photosynthetic rate respond to increasing light?
At low light intensities, how does photosynthetic rate respond to increasing light?
Increases linearly
What is the normal atmospheric carbon dioxide concentration?
What is the normal atmospheric carbon dioxide concentration?
0.04% (400 ppm)
What is photorespiration?
What is photorespiration?
Oxygen competing with CO₂ for Rubisco
When light intensity decreases, what happens to GP concentration in the Calvin cycle?
When light intensity decreases, what happens to GP concentration in the Calvin cycle?
Increases initially
When CO₂ concentration decreases, what happens to RuBP levels?
When CO₂ concentration decreases, what happens to RuBP levels?
Increases
How does net photosynthetic rate differ from gross rate?
How does net photosynthetic rate differ from gross rate?
Net = O₂ produced - O₂ used in respiration
If light intensity is 1000 lux at 10 cm, what is it at 20 cm (inverse square law)?
If light intensity is 1000 lux at 10 cm, what is it at 20 cm (inverse square law)?
250 lux