Unit 2 Test Part 2

Front

What is the 10% Rule?

Back

Only 10% of the energy is passed on with each transfer.

Front

According to the 10% rule, if the primary producers in an ecosystem collected 1,000 calories through photosynthesis, how many calories would be transferred to the primary consumers?

Back

100

Front

Why are most food webs only 3 or 4 trophic levels?

Back

Because the energy runs out very quickly.

Front

The division of a large habitat into smaller, disconnected sections is called habitat ____________.

Back

Fragmentation

Front

Tertiary consumer is just another way to say ____________.

Back

Apex predator

Front

What are primary producers?

Back

Organisms that produce energy through photosynthesis, such as plants.

Front

Define primary consumers.

Back

Organisms that eat primary producers; they are herbivores.

Front

What is a food web?

Back

A complex network of feeding relationships among organisms in an ecosystem.

Front

What is a trophic level?

Back

Each step in a food chain or food web, representing a different level of energy transfer.

Front

What role do decomposers play in an ecosystem?

Back

They break down dead organic matter, recycling nutrients back into the ecosystem.