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Biology
Biology paper 1
Photosynthesis practical
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Created by
Grace Abodunwa
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Cards (20)
What should you be able to describe by the end of the video?
Investigate
light intensity's
effect on
photosynthesis
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What should higher tier students explain regarding the results?
How results are affected by the
inverse square law
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What equipment is used to start the experiment?
Boiling tube
LED light source
Sodium hydrogen carbonate
solution
Pond weed
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Why is an LED light source preferred in the experiment?
It releases
minimal
heat affecting temperature
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What is the purpose of the beaker of water when using a normal light bulb?
To absorb
heat produced
by the bulb
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What does sodium hydrogen carbonate solution release?
Carbon dioxide
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What should be observed from the cut end of the pond weed?
Bubbles
of gas being produced
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How long should the pond weed acclimatize in the boiling tube?
Five minutes
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What gas is produced by photosynthesis?
Oxygen
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What is the procedure after starting the stopwatch?
Count the number of bubbles produced in
one minute
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How many times should the bubble count be repeated?
Two
more times
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What is the next step after calculating the mean number of bubbles?
Repeat the experiment at
different distances
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What distances should the experiment be repeated at?
20 cm
,
30 cm
, and
40 cm
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What are the main problems with counting bubbles in the experiment?
Bubbles can be too fast to count
accurately
Bubbles vary in
size
, affecting count consistency
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How can the problems with counting bubbles be solved?
Measure the
volume
of oxygen produced
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What equipment is used to measure the volume of oxygen produced?
Measuring cylinder
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What happens to the number of bubbles per minute when the distance is doubled?
It falls by a
factor
of four
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What is the scientific term for the relationship between distance and light intensity in this experiment?
Inverse square law
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Why does light intensity affect the number of oxygen bubbles produced?
Light is needed for
photosynthesis
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What should students be able to do after watching the video?
Describe the investigation of
light intensity
on
photosynthesis
Explain the
inverse square law
effects for higher tier students
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