Investigating the effect of light intensityon photosynthesis rate (Edexcel GCSE Biology): Flashcards
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What does photosynthesis convert?
What does photosynthesis convert?
Light energy, & water into glucose & oxygen
Aquatic plants used in photosynthesis experiment
Aquatic plants used in photosynthesis experiment
Cabomba or Canadian pondweed
What is measured to determine photosynthesis rate?
What is measured to determine photosynthesis rate?
Oxygen production (bubbles released)
Volume of sodium hydrogen carbonate solution used
Volume of sodium hydrogen carbonate solution used
45 cm³
Concentration of sodium hydrogen carbonate solution
Concentration of sodium hydrogen carbonate solution
1%
Why is sodium hydrogen carbonate solution used?
Why is sodium hydrogen carbonate solution used?
Provides carbon dioxide for photosynthesis
Length of Cabomba pondweed cut
Length of Cabomba pondweed cut
8 cm
Orientation of pondweed in boiling tube
Orientation of pondweed in boiling tube
Cut end facing upwards
Initial distance of pondweed from light source
Initial distance of pondweed from light source
10 cm
Acclimation time before measuring bubbles
Acclimation time before measuring bubbles
Five minutes
Number of times bubble measurement is repeated
Number of times bubble measurement is repeated
Five times
Independent variable in light intensity experiment
Independent variable in light intensity experiment
Distance from light source (light intensity)
Dependent variable in light intensity experiment
Dependent variable in light intensity experiment
Number of bubbles produced per minute
Effect of higher light intensity on photosynthesis rate
Effect of higher light intensity on photosynthesis rate
Increases the rate of photosynthesis
Effect of increasing distance on photosynthesis rate
Effect of increasing distance on photosynthesis rate
Decreases the rate (light intensity decreases)