Energy Flow

Question 1

What two things do organisms need energy for doing?

Answer 1

1. to build new cells for growth and repair

2. to provide energy for movement such as generating head to keep warm

Question 2

Explain Transfer of energy (use example of mouse, grass and eagle as well)

Answer 2

when a mouse eats it grass a transfer of energy from the grass to mouse occurs. The mouse then uses 90% of this energy to keep warm, build new cells and grow etc. When an eagle comes along to eat the mouse he only gets 10% of the energy because the rest has been used.

Question 3

Why are food chains short?

Answer 3

Because 90% of energy is being used up at a time from the original source so it runs out quickly.

Question 4

What does an energy pyramid represent?

Answer 4

represents the energy in food materials at each level in a food chain. The area of each rectangle represents the amount of energy

Question 5

What does a productivity pyramid show?

Answer 5

shows how much energy is used up per square meter by each feeding level in a year. Gives an idea of how productive and ecosystem is (how well it supports life)