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1. Producers are photosynthetic organisms that manufacture organic substances using
light energy, water and carbon dioxide

2. The arrows in a food chain represent the flow of energy

3. Each stage in a food chain is known to as trophic level

4. Detrivores are earthworms and woodlice.

5. Consumers are…

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Most food chains have only four or five trophic levels because inefficient energy is
available to support a large enough breeding population at trophic levels higher than
The total mass organisms in a particular place (biomass) is less at high trophic levels

11. Mutualism is two organisms living together…


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