Ecology CFA

What is the main source of energy in an ecosystem?

• Primary consumers

• Tertiary consumers

• The sun

• Water

How much energy is transfers from one trophic level to the next?

• 10%

• 20%

• 50%

• 100%

Using the organisms from the previous example, which of the following organisms are autotrophs?

• sea otter

• urchin and crab

• plankton and kelp

• clams and mussels

What major trophic level isn't listed in the reading?

• Producers

• Primary consumers

• Secondary consumers

• Decomposers

A ___________ is an organism that can’t create it’s own food. It must get it’s nutrition from other organisms.

Draw arrows to make a food web.

- Use RED for producers

- Use GREEN for primary consumers

- Use BLUE for secondary consumers

Organize the organisms into the following food pyramid.

c

d

b

a

Urchin and Crab

Kelp

Sea Lions

Sea Otter

Label the trophic levels of the pyramid.

c

d

b

a

producer

secondary consumer

primary consumer

tertiary consumer

Calculate the the amount of energy being transferred

c

d

b

a

625,000 kcal

625 kcal

62,500 kcal

6,250 kcal