7th Grade Exam-Units 6 & 7 Review

Front

What does the bottom level of an energy pyramid represent?

Back

Producer

Front

Why are wetlands important to our ecosystem?

Back

Wetlands are key in purifying our water supply.

Front

How does nitrogen move from the atmosphere into the soil in the nitrogen cycle?

Back

Through nitrogen-fixing bacteria.

Front

What is it called when two species compete for the same resource?

Back

Competition

Front

What type of relationship do barnacles have with whales?

Back

Commensalism

Front

Define 'producer' in an ecosystem.

Back

An organism that can make its own food, typically through photosynthesis.

Front

What is 'mutualism'?

Back

A symbiotic relationship where both species benefit.

Front

What is 'predation'?

Back

An interaction where one organism (the predator) kills and eats another (the prey).

Front

What is 'parasitism'?

Back

A relationship where one organism benefits at the expense of another.

Front

What role do decomposers play in an ecosystem?

Back

They break down dead organisms and recycle nutrients back into the soil.