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cpac 10
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Izzi Begley
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Cards (13)
Photosynthetic pigments
Chlorophyll alpha,
chlorophyll beta
,
carotene
etc.
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Wavelengths of light
Different wavelengths are absorbed by
photosynthetic
pigments
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More
light
absorbed
Increases rate of
photosynthesis
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Light
not
absorbed
Will be
reflected
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Filters
Block out certain
wavelengths
(and therefore colours) of light from reaching the
chloroplast
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Filters blocking wavelengths
Affects rate of
photosynthesis
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Measuring rate of
photosynthesis
By
measuring
volume of gas produced (assumed to be
oxygen
)
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Equipment
Pondweed
Beaker
Sodium hydrogencarbonate
Aluminum foil
Spatula
Light filters
(pieces of coloured cellophane)
Photosynthometer
Paperclip
Bench lamp
Ruler
Thermometer
Stop clock
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Method
1. Place
pondweed
in beaker of water
2. Cover one side with
aluminium
foil to block out
light
3. Cover other side with
light
filter
4. Add
sodium hydrogencarbonate
to provide carbon dioxide
5. Leave for
5
minutes
6. Place bench lamp at set
distance
7. Set up
photosynthometer
and leave for
5
minutes
8. Record
volume
of gas produced
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Biohazard
- Use
disinfectant
, wash hands with soap after handling
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Lamps
- Do not look directly at
lamp
, wait for afterimage to disappear
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Sodium hydrogencarbonate
- Wear
eye protection
, avoid contact with skin
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Graph
Plot a bar graph of
colour
of
filter
against volume of gas produced
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