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Describe photosynthetic organisms
Photosynthetic organisms (plants and algae) are the main producers of food, which they synthesise from sunlight in a process called photosynthesis. They are also therefore the primary producers of biomass.
How does photosynthesis in plants and algae work as an endothermic reaction?
Photosynthesis in plants and algae work as an endothermic reaction by using light energy to react carbon dioxide and water to produce oxygen.
Recall the equation for photosynthesis.
carbon dioxide + water → glucose + oxygen
What is photosynthesis?
A series of chemical reactions, catalysed by enzymes.
Where is photosynthesis found?
Photosynthesis happens in plants and algae in the chloroplasts of the leaves. The chloroplasts contain a green pigment called chlorophyll which enables an endothermic reaction.
What happens when temperature affects the rate of photosynthesis?
As temperature increases, so does the rate of photosynthesis because photosynthetic enzymes work best in the warmth. Here, the limiting factor is temperature.
Most plant enzymes are denatures at about 45 degrees celsius. Here, photosynthesis stops and the rate falls to zero. Light and carbon dioxide are now the limiting factor.
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