4.2

Question 1

What do producers rely on for energy ?

Answer 1

Sunlight

Question 2

What is energy flow?

Answer 2

The process of passing energy from one organism to another through feeding

Question 3

What is a food chain?

Answer 3

Sequences showing the feeding relationships and energy flow between species

Question 4

What is a trophic level?

Answer 4

An indicator of how many organisms energy has flowed through

Question 5

What energy can be transferred?

Answer 5

Only chemical energy in food can be transferred to the next trophic level. Only around 10% is transferred

Question 6

What are some reasons for energy loss?

Answer 6

1. Not all of the parts of an organism are swallowed
2. Not all the parts of an organism can be digested and used
3. Some organisms die before being eaten by an organism on the next trophic level
4. Energy is lost as heat

Question 7

What is the pyramid of energy?

Answer 7

A diagram that shows how much energy flows from on trophic level to the next in a community

Question 8

What are limits to trophic levels?

Answer 8

• the amount of energy entering the ecosystem is limited
• so much energy is lost as heat
• after many trophic levels, not much energy left