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The notes for Nutrition for IGCSE EDEXCEL
This is a draft cheat sheet. It is a work in progress and is not finished yet.
PHOTOSYNTHESIS
Photosynthesis |
- the process where some organisms are able to turn light energy into chemical energy |
Organisms that use photosynthesis |
- producers |
reaction of photosynthesis |
- endothermic reaction |
Where does it take place? |
- in chloroplasts |
word equation |
- Carbon Dioxide + water --> Glucose + Oxygen |
Symbol equation |
- 6CO2 + 6H2O --> C6H1206 + 6O2 |
Effect of temperature on rate of photosynthesis |
- As temperature increases, the rate of photosynthesis. Once temperature exceeds the optimum, the rate of photosynthesis decreases as enzymes start to denature |
Effect of light intensity on rate of photosynthesis |
- as light intensity increases, so does rate of photosynthesis (Inverse square law: as distance from light source doubles, light intensity quarters) |
Effect of CO2 concentration on rate of photosynthesis |
- as CO2 concentration increases, so does rate of photosynthesis |
LIMITING FACTOR |
- a factor that limits the rate of a reaction when there is not enough of it. |
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PLANTS
Ways leaves are adapted for photosynthesis |
- thin which provides a short diffusion distance -spongey mesophyll layer has air pockets for efficient gas exchange -Palisade mesophyll layer has many chloroplasts for photosynthesis |
what are mineral ions used for in plants? |
- growth |
two common ions in plants |
- magnesium (Mg2+) and Nitrate (NO3-) |
why magnesium is used |
- used in chlorphyll |
why nitrate is used |
- used in amino acids |
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