Question 1

Which of the following best describes nonpoint source pollution?

Accepted Answer

Pollution that comes from multiple, diffuse sources.

Question 2

Approximately what percentage of Earth's water is freshwater, and what is the largest reservoir of this freshwater?

Accepted Answer

$$3\%$$; most is found in icecaps and glaciers

Question 3

Which of the following is NOT one of the defining characteristics of wetlands?

Accepted Answer

Wildlife

Question 4

A lake with clear water, low nutrient levels, and low productivity is best classified as:

Accepted Answer

Oligotrophic

Question 5

Which process is primarily responsible for the increase in algal blooms in lakes due to nutrient runoff from agriculture?

Accepted Answer

Eutrophication

Question 6

Which lake zone is characterized by high light penetration and supports photosynthesis?

Accepted Answer

Littoral zone

Question 7

Why do colder waters generally contain more dissolved oxygen (DO) than warmer waters?

Accepted Answer

Colder water has a higher density, which increases oxygen solubility.

Question 8

Which of the following is a significant human impact on lake ecosystems?

Accepted Answer

Invasive species introduction

Question 9

What is a watershed?

Accepted Answer

An area of land that drains into a particular drainage basin.

Question 10

Which of the following best describes an estuary?

Accepted Answer

A coastal area where freshwater meets saltwater.

Question 11

What role do decomposers play in aquatic ecosystems?

Accepted Answer

They break down dead organic matter and recycle nutrients.

Question 12

Which of the following is a major threat to stream ecosystems?

Accepted Answer

Nonpoint source pollution

Question 13

What is the primary ecological importance of wetlands?

Accepted Answer

They provide flood control, recharge aquifers, and support biodiversity.

Question 14

Which of the following is a key function of riparian zones in stream ecosystems?

Accepted Answer

They filter pollutants and provide habitat for wildlife.

Question 15

A coastal environment that includes beaches, salt marshes, and coral reefs is best described as:

Accepted Answer

A super habitat due to physical, biological, and chemical interconnections.

Question 16

Which of the following is a likely consequence of eutrophication in a lake?

Accepted Answer

Algal blooms leading to oxygen depletion and fish kills.

Question 17

Which equation best represents the relationship between temperature and dissolved oxygen in water?

Accepted Answer

$$DO = k - mT ($$where $$DO is $$dissolved oxygen, $$T is $$temperature, $$k$$ and $$m$$ are constants)

Question 18

Which of the following is NOT a typical threat to wetlands?

Accepted Answer

Groundwater recharge

Question 19

Which of the following is a service provided by ocean currents?

Accepted Answer

They distribute heat and nutrients globally.

Question 20

A stream ecosystem is classified as a lotic system. What does this mean?

Accepted Answer

It is a flowing water system.

Aquatic Environments: Structure, Function, and Importance

Study Guide - Practice Questions