GCSE Biology Revision "Required Practical 6: Photosynthesis"
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What is the purpose of the required practical in the investigation of photosynthesis?
To investigate the effect of light intensity on the rate of photosynthesis.
How does the distance of the light source affect the number of bubbles produced by the pond weed?
Doubling the distance causes the number of bubbles per minute to fall by a factor of four.
What solution is used in the boiling tube to release carbon dioxide for photosynthesis?
Sodium hydrogen carbonate solution.
Why is an LED light source preferred in the practical investigation?
LED lights do not release much heat, avoiding temperature changes in the experiment.
What alternative method can be used when counting bubbles is difficult?
Measuring the volume of oxygen produced instead of counting bubbles.
What happens to light intensity as the distance from the light source increases?
The light intensity falls by the square of the distance.
What is the term used to describe the phenomenon of light intensity decreasing with distance?
Inverse square law.
How long should the pond weed be left to acclimatize in the boiling tube?
Five minutes.
What is produced by the cut end of the pond weed during photosynthesis?
Oxygen gas.
What should be recorded at each distance in the practical experiment?
The mean number of bubbles produced per minute or the volume of oxygen produced.
What is the method for investigating the effect of light intensity on the rate of photosynthesis using pond weed?
Prepare a boiling tube with sodium hydrogen carbonate solution.
Cut the pond weed at an angle and place it in the boiling tube.
Place the boiling tube under an LED light source.
Allow the pond weed to acclimatize for five minutes.
Measure the distance from the light source to the boiling tube.
Count the number of bubbles produced per minute or measure the volume of oxygen produced at each distance.
Repeat the experiment at various distances from the light source and record the results.
What is the method for investigating the effect of light intensity on the rate of photosynthesis using pond weed?
Prepare a boiling tube with sodium hydrogen carbonate solution. 2. Cut the pond weed at an angle and place it in the boiling tube. 3. Place the boiling tube under an LED light source. 4. Allow the pond weed to acclimatize for five minutes. 5. Measure the distance from the light source to the boiling tube. 6. Count the number of bubbles produced per minute or measure the volume of oxygen produced at each distance. 7. Repeat the experiment at various distances from the light source and record the results.
What is the purpose of the required practical in the investigation of photosynthesis?
To investigate the effect of light intensity on the rate of photosynthesis.
How does the distance of the light source affect the number of bubbles produced by the pond weed?
Doubling the distance causes the number of bubbles per minute to fall by a factor of four.
What solution is used in the boiling tube to release carbon dioxide for photosynthesis?
Sodium hydrogen carbonate solution.
Why is an LED light source preferred in the practical investigation?
LED lights do not release much heat, avoiding temperature changes in the experiment.
What alternative method can be used when counting bubbles is difficult?
Measuring the volume of oxygen produced instead of counting bubbles.
What happens to light intensity as the distance from the light source increases?
The light intensity falls by the square of the distance.
What is the term used to describe the phenomenon of light intensity decreasing with distance?
Inverse square law.
How long should the pond weed be left to acclimatize in the boiling tube?
Five minutes.
What is produced by the cut end of the pond weed during photosynthesis?
Oxygen gas.
What should be recorded at each distance in the practical experiment?
The mean number of bubbles produced per minute or the volume of oxygen produced.