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1. 23/09/15
Plants and PhotosynthesisPlants and Photosynthesis

2. 23/09/15
Travels up
from the roots
WATER
CARBON DIOXIDE
Enters the leaf through small
holes on the underneath
SUNLIGHT
Gives the plant energy
CHLOROPHYLL
The green
stuff
where the
chemical
reactions
happen
Things needed for photosynthesisThings needed for photosynthesis

3. 23/09/15
Carbon dioxide + _____ glucose + _____
6CO2 + 6H20 C6H12O6 + 6O2
Sunlight
Chlorophyll
Sunlight
Chlorophyll
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
Photosynthesis equationsPhotosynthesis equations

4. 23/09/15
Photosynthesis happens in thePhotosynthesis happens in the
“palisade” cells in the leaf:“palisade” cells in the leaf:
Palisade
cells

5. 23/09/15
Close up on a palisade cell:Close up on a palisade cell:
Cell
wall
Cell
membrane
Nucleus
Large
vacuole
Cytoplasm
Chloroplasts
(containing
chlorophyll)

6. 23/09/15
Method for starch test:Method for starch test:
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

7. 23/09/15
Results:Results:
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!

8. 23/09/15
Plant roots are made of “root hair cells” which have two
features that help them to take in water and nutrients:
Root hair cellsRoot hair cells
Root
hair
cells
Thin cell membraneLarge surface area

9. 23/09/15
Using waterUsing water
Plants need water to do the following:
Enable
transport
of minerals
Enable
growth
Form
fruits
Produce
glucose
Keep the
leaves cool

10. 23/09/15
Photosynthesis and RespirationPhotosynthesis and Respiration
In earlier work we looked at respiration:
Photosynthesis is the reverse of respiration:
Glucose + oxygen water + carbon dioxide
Water + carbon dioxide glucose + oxygen