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30 Cards in this Set
- Front
- Back
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Photosynthesis |
A chemical reaction which occurs in every green plant, produces food in the the form of glucose so the plant can grow |
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Photosynthesis word equation |
Carbon Dioxide + Water --> Glucose + Oxygen |
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Photosynthesis Symbol Equation |
6 CO2 + 6 H2O --> C6H12O6 + 6 O2 |
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What 4 things are needed for photosynthesis |
Sunlight Chlorophyll Water Carbon Dioxide |
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Why is sunlight needed? |
It is a source of energy and absorbed by chlorophyll |
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How is water taken? |
Travels up from the roots |
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How is carbon dioxide taken? |
Diffuses in through the stomata into spaces between spongy mesophyll in leaves. |
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Leaf Diagram |
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Example of a leaf mutation |
Variagated Leaf - chlorophyll only in some parts |
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Bits with Chlorophyll contain what? |
starch and is needed so photosynthesis can occur |
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What happens to glucose after it has been synthesised? |
Soluble Glucose is converted into Insoluble starch Some starch is then stored in leaves, bulbs and tuber (for winter) Rest is used immediately for respiration |
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Starch |
Chain of Glucose Molecules |
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Why Insoluble Starch? |
If soluble glucose --> affects water concentration in cells Dont move away from storage areas |
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5 uses of glucose from phorosynthesis |
Respiration Fats and Oils Amino Acids Insoluble Starch Cellulose |
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Respiration (use of glucose) |
Needed to release energy for chemical reactions |
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Fats and Oils ( use of glucose) |
Production of fats and oils for storage |
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Amino Acids (use of glucose) |
Glucose combines with nitrates to make proteins and amino acids for growth |
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Insoluble starch (use of glucose) |
Producing insoluble starch in leaves and storage organs for later use |
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Cellulose (use of glucose) |
Cellulose needed for structural growth, make new cell walls and increase biomass |
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Energy and Photosynthesis |
Energy used to power the reaction and breaks apart chemical bonds Extra energy stored in the bonds of the product |
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Where is the energy? (Reactant and Product) |
Little Energy - in reactant
Greater Energy - in product |
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Is photosynthesis exothermic or endothermic? |
Photosynthesis is endothermic because it takes in light energy |
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4 limiting factors of photosynthesis |
Light Intensity Concentration of Carbon Dioxide Temperature Availability of Chlorophyll |
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Light intensity graph |
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Light intensity relationship |
Increase in light means increase in rate of photosynthesis (increase till optimum then no effect |
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Carbon dioxide relationship |
Increase in CO2 increase in rate of photosynthesis |
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CO2 Graph |
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Temperature Relationship |
Varies in different countries (adaptation) unless optimum it is the limiting factor |
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Temperature Graph |
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How do farmers maximise growth in a green house? |
Use paraffin lamps which is more light and produce more CO2 when burning and heat |
