Introduction to Photosynthesis
ie plants can make their own food! Photosynthesis: the fundamental process by which plants manufacture carbohydrates from raw materials using energy from light… ie plants can make their own food!
Photosynthesis
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Discuss and answer ? In pairs Chloroplasts containing chlorophyll Raw Materials Equipment Products Water Where does it come from? Where does it need to go? Sunlight Is sunlight a wave or particle of energy? Glucose (sugar) Where is this made? Does it stay there all the time? Carbon dioxide How does the plant take it up? Chloroplasts containing chlorophyll Where are these found? Oxygen How does this escape from the plant?
You need to know the balanced chemical equation for photosynthesis You need to know the balanced chemical equation for photosynthesis. Try and balance the equation above.
Plants’ uses of plant glucose Raw material for growth, repair and replacement of damaged parts Used immediately to provide energy source for respiration in cells (glucose + O2= energy) Energy used to turn sugars, nitrates & other nutrients into amino acids which build up proteins To make fats & oils (energy stored in seeds) Glucose Energy stored as sucrose (in fruit) Energy stored as starch (in leaves, seeds, roots and tubers) SQA LO State that green plants make their own food which may be stored as starch. Interpretation- green plants are able to make their own food. Green plants make food in the form of sugar. The sugar made by the plant is either used straight away or converted to starch and stored To make cellulose, the main structural material in cell walls
Limiting Factors in Photosynthesis
Now have a look at the demonstration of Elodea (water weed) Try and answer the following questions as you are given the demonstration What are the effects of changing: Carbon dioxide concentration Temperature Light intensity
What happens when we change these factors? Show App
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