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KS4 Photosynthesis Learning Objectives
4.1.1 Photosynthetic reaction
- Know the word equation for photosynthesis:
carbon dioxide + water → (light) glucose + oxygen
- Know the chemical equation for photosynthesis: (HT only)
6CO2 + 6H2O → (light) C6 H12O6 + 6O2
- Be able to describe photosynthesis as an endothermic reaction in which energy is transferred from the environment to the chloroplast by light.
4.1.2 Rate of photosynthesis
- Be able to explain the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis and to interpret graphs of photosynthesis rate involving one limiting factor.
- Know that these factors interact and any one of them may be the factor that limits photosynthesis. (HT only)
- Be able to explain graphs of photosynthesis rate involving two or three factors and decide which is the limiting factor. (HT only)
- Understand and use inverse proportion – the inverse square law and light intensity in the context of photosynthesis. (HT only)
- Know that limiting factors are important in the economics of enhancing the conditions in greenhouses to gain the maximum rate of photosynthesis while still maintaining profit. (HT only)
- Be able to use data to relate limiting factors to the cost effectiveness of adding heat, light or carbon dioxide to greenhouses.
- Be able to:
- measure and calculate rates of photosynthesis
- extract and interpret graphs of photosynthesis rate involving one limiting factor
- plot and draw appropriate graphs selecting appropriate scale for axes
- translate information between graphical and numeric form.
4.1.3 Conversion of photosynthetic energy
- Know that the glucose produced in photosynthesis may be:
- used for respiration
- converted into insoluble starch for storage
-used to produce fat or oil for storage
-used to produce cellulose, which strengthens the cell wall
- used to produce amino acids for protein synthesis.
- Know that to produce proteins, plants also use nitrate ions that are absorbed from the soil.
- Know the tests to identify starch, glucose and proteins using simple qualitative reagents.
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