Download Plants and Photosynthesis - Prairie Rose School Division No. 8

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Plants and Photosynthesis
W Richards
Worthing High School
Things needed for photosynthesis
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SUNLIGHT
Gives the plant energy
CHLOROPHYLL
WATER
Travels up
from the roots
CARBON DIOXIDE
Enters the leaf through small
holes on the underneath
The green
stuff
where the
chemical
reactions
happen
Photosynthesis equations
Carbon dioxide + _____
Sunlight
Chlorophyll
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glucose + _____
Sunlight
6CO2
+ 6H20
Chlorophyll
C6H12O6 + 6O2
The GLUCOSE produced by photosynthesis is used by the
plant for _______ (through ____________). It is stored
in the plant as ___________.
Words – respiration, starch, water, oxygen, energy
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Photosynthesis happens in the
“palisade” cells in the leaf:
Palisade
cells
Close up on a palisade cell:
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Cell
wall
Cell
membrane
Large
vacuole
Chloroplasts
(containing
chlorophyll)
Nucleus
Cytoplasm
Method for starch test:
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1) Cover up part of the leaf using black card
What effect does this have on the plant?
2) Boil the leaf for a few minutes
What does this do to the leaf?
3) Soak the leaves in alcohol
What effect does this have on the leaf?
4) Dip the leaves in water
What effect does this have?
5) Drop some iodine onto the leaf
What do you see? Draw and explain your results
Results:
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The parts of the leaf which have been photosynthesising
should have turned black.
This shows that the part of the leaf which was covered up
has not been photosynthesising, because it had no light.
NO LIGHT, NO PHOTOSYNTHESIS, NO STARCH!
Root hair cells
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Plant roots are made of “root hair cells” which have two
features that help them to take in water and nutrients:
Root
hair
cells
Large surface area
Thin cell membrane
Using water
Plants need water to do the following:
Enable
transport
of minerals
Produce
glucose
Form
fruits
Keep the
leaves cool
Enable
growth
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Photosynthesis and Respiration
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In earlier work we looked at respiration:
Glucose
+
oxygen
water
+
carbon dioxide
Photosynthesis is the reverse of respiration:
Water
+
carbon dioxide
glucose
+ oxygen