AS Associate Of Science In Environmental Science 2

Question 1

What is the nitrogen cycle's role in ecosystems?

Accepted Answer

Circulating nitrogen from the atmosphere to living organisms and back

Answer

The nitrogen cycle describes the movement of nitrogen through the atmosphere, soil, water, and living organisms, making it available for plant growth and protein synthesis.

Question 2

Which type of pollution refers to contaminants that enter water from diffuse sources across large land areas?

Accepted Answer

Non-point source pollution

Answer

Non-point source pollution comes from diffuse sources, such as agricultural runoff, urban stormwater, and atmospheric deposition, making it difficult to regulate at a single discharge point.

Question 3

What is the term for the variety and variability of life forms within a given ecosystem or on Earth?

Accepted Answer

Biodiversity

Answer

Biodiversity refers to the variety of life at all levels — genetic diversity, species diversity, and ecosystem diversity — and is a key indicator of ecosystem health.

Question 4

Which process converts ammonia (NH₃) in soil into nitrates that plants can absorb?

Accepted Answer

Nitrification

Answer

Nitrification is the two-step microbial process in which soil bacteria (Nitrosomonas and Nitrobacter) convert ammonia first to nitrite and then to nitrate, which plants absorb.

Question 5

What is the greenhouse effect?

Accepted Answer

The process by which atmospheric gases trap heat radiated from Earth's surface

Answer

The greenhouse effect occurs when greenhouse gases (CO₂, CH₄, H₂O vapor, N₂O) absorb and re-emit infrared radiation from Earth's surface, warming the lower atmosphere.

AS - Associate In Science Degrees Practice Test

AS - Associate In Science Degrees Practice Test

AS Associate Of Science In Environmental Science 2