Photosynthesis RP Flashcards
(13 cards)
What is the aim of Required Practical 6?
To investigate the effect of light intensity on the rate of photosynthesis using pondweed.
What organism is commonly used in this practical?
Pondweed.
Why is pondweed used in this photosynthesis practical?
It is easy to observe and measure the oxygen output as bubbles.
What is the independent variable (IV) in this experiment?
Light intensity (changed by adjusting the distance of the lamp).
What is the dependent variable (DV) in this experiment?
Number of bubbles produced in one minute.
What are the control variables (CVs) in this experiment?
Temperature of water
Describe the method used in this practical.
Place pondweed in water
Why are at least three readings taken at each distance?
To identify anomalous results and calculate a reliable mean.
What does an increase in bubbles indicate about the rate of photosynthesis?
An increase in the rate of photosynthesis.
What happens to the rate of photosynthesis as the lamp gets closer to the pondweed?
It increases due to more light energy received.
Why might the rate of photosynthesis level off at a certain point?
Because another factor (not light) becomes limiting.
What safety precautions should be taken during this practical?
Handle hot lamp carefully
