Zusammenfassung der Ressource
Photosynthesis and Plant nutrition
- Photosynthesis is the
chemical reaction that occurs
in plants to enable them to
produce glucose in the
presence of sunlight
- Light Energy -
Chemical Energy
- Carbon Dioxide +
Water -> Glucose +
Oxygen
- 6CO2 + 6H2O ->C6H12O6 + 6O2
- There are three variables that
affect the rate of
photosynthesis
- Amount of Carbon Dioxide
- Light intensity
- Temperature
- Structure of the leaf
- From top to bottom
of the leaf
- 1.The epidermis is thin and
transparent, so allows light to
reach the palisade cells
- 2. Waxy Cutical protects the leaf
without blocking out the light
- 3. The palisade cell
absorbs the light
- 4. The spongy layer
allows CO2 to diffuse
through and also
provides a large
surface area
- 5. The palisade cells contain Chloroplasts
which are the part of the cell which absorbs
the light
- 4 Minerals are needed by plants
- Magnesium
- In chloroplasts - needed for chlorophyll
- Leaves turn yellow
when not enough is
present
- Phosphate
- Used in respiration and growth
- key part in DNA
- Discoloured
leaves show not
enough is present
- Potassium
- Used in respiration and photosynthesis
- Poor flower or fruit
yield shows not
enough is present
- Nitrates
- needed for amnio acids
- Yellow leaves
means a lack of it
- Starch test
- Soften leaf in boiling water for 1
min, place leaf in tube of ethanol,
after 5 mins take it out and rinse
in HOT water, spread leaf out and
cover lightly with an iodine
solution. See what colour it is