Environmental Science Ecosystems and Ecology

Question 1

Which term describes all living organisms and their physical environment interacting as a system?

Accepted Answer

Ecosystem

Answer

Biome

Answer

Community

Answer

Population

Question 2

What is the primary source of energy for most ecosystems on Earth?

Accepted Answer

Sunlight

Answer

Wind

Answer

Water

Answer

Geothermal heat

Question 3

Which trophic level consists of organisms that convert solar energy into chemical energy?

Accepted Answer

Producers

Answer

Primary consumers

Answer

Secondary consumers

Answer

Decomposers

Question 4

The process by which nitrogen-fixing bacteria convert atmospheric N₂ into ammonia is called:

Accepted Answer

Nitrogen fixation

Answer

Nitrification

Answer

Denitrification

Answer

Ammonification

Question 5

Which ecological concept describes the variety of species in a given area?

Accepted Answer

Biodiversity

Answer

Biomass

Answer

Biotic potential

Answer

Bioaccumulation

Question 6

In a food chain, approximately what percentage of energy is transferred from one trophic level to the next?

Accepted Answer

10%

Answer

1%

Answer

50%

Answer

90%