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Chapter 1 Energy and
Photosynthesis
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Energy
Both living and non-living things need energy.
Energy is needed for things to move and
work.
Living things need energy to carry out life
processes.
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Are Tom and Corrine correct?
I don’t need
energy when
I’m resting.
I don’t need
energy when
I’m thinking.
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Where do the followingthings get energy from?
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Food is the source of energy for living
things. Do the following food come from
plants or animals?
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Trace the source of the food we eat. Do most of
the food come directly or indirectly from plants?
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I eat only meat, noodles
and bread. I don’t depend
on plants for food too!
Meat-eaters like tigers don’t
depend on plants for food
and energy.
Are Tom and Corrine correct?
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Photosynthesis
Plants use light energy, carbon dioxide and water to make food in a process called
photosynthesis.
The food produced is in the form of sugar.
Oxygen gas is given out during photosynthesis.
Carbon dioxide + Waterlight
Sugar + Oxygen
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Where do the carbon dioxide, water and light
needed for photosynthesis come from?
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During photosynthesis, plants trap sunlight
using a green pigment called chlorophyll whichis found in the chloroplasts of plant cells.
Which parts of plants can you find chlorophyll?
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How does carbon
dioxide enter the
leaves? How dooxygen and water
vapour escape from
the leaves?
Stomata are tiny openingsusually found on the
underside of leaves.
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Is it true…
… plants get food from the soil?
… fertilisers are food for plants?
… plants take in water through the leaves?
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Testing for starch
Yellowish
brown iodine
solution
Starch mixed with iodine
solution
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Put on your
thinking cap…
The leaf shown here hasbeen prepared and tested
for starch with iodine
solution. Which part(s)of the leaf has/have
made food?
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Investigating whether carbon dioxide is
necessary for photosynthesis
What is the difference between the two set-ups?
What is the purpose of putting solution X in
set-up A?
XSet-up A Set-up B
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Investigating whether light is necessary
for photosynthesis
Variable to change
Variables to keep constant
Observations/Measurements to make
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Put on your thinking cap…
Is a Venus flytrap able to carry out photosynthesis?
Why does it need to trap insects or other small
animals?
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Is it true…
… plants cannot make food in artificial light?
… plants with non-green leaves cannot carry
out photosynthesis?
… only the leaves of plants can carry out
photosynthesis?
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Plants make food in
the form of starch.
They store
the starch in
their leaves.
Are Tom and Corrine correct?
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