Required Practical: Photosynthesis Rate (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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What is measured to show photosynthesis rate?
What is measured to show photosynthesis rate?
Oxygen produced
Three factors tested affecting photosynthesis rate
Three factors tested affecting photosynthesis rate
Light intensity, CO₂ concentration, temperature
Purpose of sodium hydrogen carbonate solution
Purpose of sodium hydrogen carbonate solution
Provide CO₂ / increase CO₂ concentration
Example aquatic plant used in this practical
Example aquatic plant used in this practical
Pondweed (Elodea)
How oxygen production is observed
How oxygen production is observed
Gas bubble forms in capillary tube
What measurement indicates oxygen production?
What measurement indicates oxygen production?
Distance oxygen bubble travels
Distance bubble travels is proportional to
Distance bubble travels is proportional to
Volume of oxygen produced
How to vary light intensity in experiment
How to vary light intensity in experiment
Move lamp closer or further from test tube
Effect of increasing light intensity on rate
Effect of increasing light intensity on rate
Increases then levels off (limiting factor)
Effect of increasing temperature on rate
Effect of increasing temperature on rate
Increases to optimum, then decreases (enzymes denature)
Effect of increasing CO₂ concentration on rate
Effect of increasing CO₂ concentration on rate
Increases until another factor becomes limiting
Application of understanding these factors
Application of understanding these factors
Optimising plant growth in greenhouses