Energy transfer and Food webs

How does energy transfer work along a food chain

1. sun is the source of energy for nearly all life on earth

2. plants use sun as energy to make food (photosynthesis)

3. when the primary consumer eats the producer not all the energy is transferred (at each trophic level energy is lost) 100% becomes 90"%

4. secondary consumer may not eat all of the animal e.g bones and fur → energy isn’t taken in

5. some energy is lost a faeces

6. most energy is used in respiration

7. only 10% of energy is passed down at each trophic level

What do food webs show

food webs show how food chains are linked to each other

How do food chains start

They all start with a producer (photosynthetic organism)

As energy is passed up the trophic levels

energy is lost

As you go up the group the arrows show……..

the energy transfer