food chains
- Created by: esther christie
- Created on: 22-05-13 15:27
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- food chains
- primary producers
- are able to produce organic materials from inorganic molecules e.g. plants
- only 1% of sunlight that falls on plants is photosynthesised
- this is because some light is the wrong wavelength, some light does not land on the chloroplast, some energy is lost in heat
- primary consumers
- they obtain energy from primary producers
- unto 10% of the plant tissue energy is passed onto the primary consumer
- this is because a lot of the plant tissue is cellulose and lignin and cannot be digested,some parts of the plant are unable to be eaten
- secondary and tertiary consumers
- are at the next trophic levels
- up to 20% of the energy from primary consumers is passed on to the secondary consumers
- this is because the tissue is mainly proteins and fats which are higher in energy and easier to digest, some parts of the animal cannot be digested.
- decomposers and detritivores
- bacteria, fungi, earthworms and woodlice break down dead organisms and faeces
- at every trophic level molecules are used in respiration to produce ATP which is used for muscle contraction and active transport
- primary producers
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