B1.5 Energy And Biomass In Food Chains

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GCSE Biology (B1) Mind Map on B1.5 Energy And Biomass In Food Chains, created by killthemoment on 08/02/2014.

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B1.5 Energy And Biomass In Food Chains
1 B1.5.1 Energy In Biomass
1.1 By observing the numbers and sizes of the organisms in food chains we can find out what happens to energy and biomass as it passes along the food chain.
1.1.1 Radiation from the Sun is the source of energy for most communities of living organisms. Green plants and algae absorb a small amount of the light that reaches them. The transfer from light energy to chemical energy occurs during photosynthesis. This energy is stored in the substances that make up the cells of the plants. The mass of living material (biomass) at each stage in a food chain is less than it was at the previous stage. The biomass at each stage can be drawn to scale and shown as a pyramid of biomass. The amounts of material and energy contained in the biomass of organisms is reduced at each successive stage in a food chain because some materials and energy are always lost in the organisms' waste materials and respiration supplies all the energy needs for living processes, including movement. Much of this energy is eventually transferred to the surroundings. The first group of organisms in a food chain, plants, are known as the primary producers. Those who then eat the plants are called the primary consumers. The next stage of the food chain involves the secondary consumers and after that, the tertiary consumers.
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