Topic 6 - Core Practical: Light Intensity And Rate Of Photosynthesis

Question 1

What is the main objective of the experiment described?

Answer 1

To measure the rate of photosynthesis in a plant

Question 2

What materials are needed for the photosynthesis experiment?

Answer 2

• 100ml flask filled with water at room temperature
• Gas syringe
• Small amount of pondweed
• Small lamp
• 1m ruler

Question 3

What is the initial distance the flask and pondweed should be placed from the lamp?

Answer 3

15cm

Question 4

How long should the apparatus be left to allow the pondweed to adjust?

Answer 4

Around 10 minutes

Question 5

What measurement is taken after 5 minutes?

Answer 5

Record the change in volume on the gas syringe

Question 6

What should be done after the initial measurement is taken?

Answer 6

Move the lamp 10cm further away and measure the volume change again

Question 7

What should be plotted on the graph after conducting the experiment?

Answer 7

• Distance from lamp on the x-axis
• Change in gas volume on the y-axis

Question 8

Fill in the blank: The experiment measures the rate of photosynthesis by observing the _______ of gas produced.

Answer 8

volume

Question 9

True or False: The gas syringe is used to measure the amount of oxygen produced by the pondweed.

Answer 9

True