Photosynthesis Worksheets
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4by Dr Anne Ramage
of the Roslin Institute, Edinburgh
Sunlight
Plants can make their own food
which they use for energy to grow.
Food
Plants contain a green chemical
(Sugar) +
Oxygen
Oxygen
called
chlorophyll
which can
absorb energy from sunlight.
This energy is used to turn the
Carbon Dioxide
simple chemicals
carbon dioxide
gas from the air, and
water
from
the soil) into larger chemicals
Water
called sugars.
Chemical reaction:
Carbon dioxide + water + light energy
sugar (glucose) + oxygen
Most of a plant’s chlorophyll is found in the cells
of its leaves - it is what makes them green. It is
stored in little discs called chloroplasts, which are
found just inside the cell walls. These chloroplasts
can move about the cell, according the Sun’s
position and strength.
If the sunlight is very strong the chloroplasts move
down the cell, away from the light. If it is weak they
move up the cell again.
Strong Sunlight
Weak Sunlight
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