Biology- Energy flows (B1)

Very short notes on energy transfer

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Energy and nutrient transfer

Organisms need food for energy to move, keep warm etc

Organisms need food for growth: food provides the proteins, fats and carbohydrates- the raw materials needed to build new cells

Biomass is the weight of a organism as it builds new cells and tissues

The source of energy for all living things is the sunlight

Each step in a food chain is called a trophic level

Biomass is lost in faeces because not everything consumed can be digested

The amounts of energy and biomass contained in living organisms always decreases at a stage of a food chain because biomass is lost as waste products and is used to produce energy. This energy is used in movement, in controlling the body temp and in growth etc. 

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