9 c plants and photosynthesis (whs)
-
Upload
preeti-ghosh -
Category
Education
-
view
345 -
download
5
description
Transcript of 9 c plants and photosynthesis (whs)
08/04/23
Plants and Plants and PhotosynthesisPhotosynthesis
W Richards
Worthing High School
08/04/23
Travels up from the roots
WATER
CARBON DIOXIDEEnters the leaf through small holes on the underneath
SUNLIGHTGives the plant energy CHLOROPHY
LL The green stuff where the chemical reactions happen
Things needed for Things needed for photosynthesisphotosynthesis
08/04/23
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
08/04/23Photosynthesis happens Photosynthesis happens in the “palisade” cells in in the “palisade” cells in
the leaf:the leaf:
Palisade
cells
08/04/23Close up on a palisade Close up on a palisade cell:cell:
Cell wall
Cell membrane
NucleusLarge vacuole
Cytoplasm
Chloroplasts (containing chlorophyll)
08/04/23
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
08/04/23
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!
08/04/23
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 membrane
Large surface area
08/04/23
Using waterUsing waterPlants need water to do the following:
Enable transport of minerals
Enable growth
Form fruits
Produce glucose
Keep the leaves cool
08/04/23Photosynthesis and Photosynthesis and RespirationRespiration
In earlier work we looked at respiration:
Photosynthesis is the reverse of respiration:
Glucose + oxygen water + carbon dioxide
Water + carbon dioxide glucose + oxygen