13.1 Food chains and energy transfer

• What does an ecosystem include?


  All organisms living in a particular area and the non-living elements of that environment
• What is the community in an ecosystem?


  The community consists of all the organisms living in a particular area
• what is biomass?


  Most of the sugars synthesised by plants are used by the plant as respiratory substrates. The rest are used to make other groups of biological molecules. These biological molecules form the biomass of the plants.