Photosynthesis
- Created by: Freya Woolley
- Created on: 05-05-15 17:18
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- Photo- synthesis
- 6CO2 + 6H20 --> C6H12O6 + 602
- Adaptions of plants for p/s
- Stomata
- Underneath the leaf and able to open and close
- Gases diffuses through air spaces to cells. Oxygen out- CO2 enters. Close at night to stop CO2 loss
- Underneath the leaf and able to open and close
- Xylem- attached to root hair cell
- Water diffuses into the xylem from the soil and the roots. It is then transported around the plant
- Phloem
- Carries food away from the leaf after photo-synthesis
- Takes glucose to roots, fruits, seeds and buds
- Carries food away from the leaf after photo-synthesis
- Chlorophyll
- Absorbs sun light and energy
- Stomata
- Uses of glucose in a plant
- Used for respiration
- Converted into insoluble starch for storage
- Used to produce fats or oils for storage
- Used to produce cellulose, strengthen cell walls
- Limiting factors
- Light intensiity
- CO2 Conc.
- Temperature
- CO2 Conc.
- The factor that is furthest from its optimum level controls the rate of p/s
- Light intensiity
- Mineral nutrition
- Nitrate- NO3-
- Makes amino acids, proteins, chlorophyll, DNA and others
- Stunted growth, older leaves turn yellow
- Magnesium- Mg 2+
- Needed to make chlorophyll
- Leaves turn yellow
- Nitrate- NO3-
- P/s and respiration
- Hight light intensity- p/s>resp.
- CO2 from resp used up quickly- low CO2 conc.
- Low light intensity- p/s< resp.
- CO2 from resp. isn't used- high CO2 conc.
- P/s only during day
- Resp. all the time
- Hight light intensity- p/s>resp.
- Tests
- Starch test
- p- blue/black n- stays golden
- Effect of LI on balance between p/s and resp
- Purple -CO2 Red neutral Yellow +CO2
- Starch test
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