6.5 - Core Practical: Light Intensity and Rate of Photosynthesis Flashcards
What materials are needed for the photosynthesis experiment?
A sealed 100ml flask filled with water at room temperature, a gas syringe, a small amount of pondweed, a small lamp, and a 1m ruler.
How far should the flask and pondweed be placed from the lamp?
15cm from the lamp.
How long should the apparatus be left to allow the pondweed to adjust?
Around 10 minutes.
What should be done after the initial 10 minutes?
Connect the gas syringe to the flask and record the change in volume on the syringe after 5 minutes.
What is the next step after measuring the volume change?
Move the lamp 10cm further away and measure the volume change again. Repeat this process.
How should the results be plotted?
On a graph of distance from lamp on the x-axis and change in gas volume on the y-axis.
