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biology - topics
photosynthesis
required practical
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Created by
lexie degiorgis
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Cards (13)
Rate of
Photosynthesis
The rate at which
photosynthesis
occurs
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One graph
may show the effect of many
limiting
factors
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The graph on the right shows how the rate of
photosynthesis
is affected by
light intensity
and
temperature
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As
light intensity
increases
The rate of
photosynthesis
increases
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When
light
becomes a
limiting factor
The rate of
photosynthesis
levels off
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At
higher
CO2 concentration (
0.4%
)
The rate of
photosynthesis
levels off at a
higher
point than at
lower
CO2 concentration (
0.04%
)
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CO2 concentration was also a
limiting factor
at
0.04
% CO2
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Temperature
was not a limiting factor as it was the same (
25°C
) for both
CO2
concentrations
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Oxygen production
Shows the rate of photosynthesis
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Inverse square law
The
relationship
between light
intensity
and
distance
from the
light
source
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Measuring the rate of photosynthesis using Canadian pondweed
1.
Place light source
at specific distances from pondweed
2.
Leave pondweed
to
photosynthesise
for set time
3.
Measure length
of
O2 bubble
produced
4.
Repeat with different light distances
5.
Can also measure effect
of
temperature
or
CO2 concentration
View source
Variables
that could
affect
the
results
should be
controlled
, e.g.
temperature
and
time
the pondweed is left to
photosynthesise
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The experiment is repeated
twice
at each
light distance
and the
mean O2 volume
is calculated
View source
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