Question 1

Which of the following best describes the difference between abiotic and biotic factors in an ecosystem?

Accepted Answer

Abiotic factors are non-living physical and chemical components, while biotic factors include all living organisms.

Question 2

A scientist is studying the effect of increased nitrogen runoff on the population of algae in a freshwater lake. Which level of ecological organization is primarily being investigated?

Accepted Answer

Population

Question 3

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while collecting nectar

Question 4

In a food chain, which trophic level is occupied by zooplankton in an ocean ecosystem?

Accepted Answer

Primary consumers

Question 5

Which of the following best explains why wolves are considered a keystone species in Yellowstone National Park?

Accepted Answer

Their presence regulates populations of other species, leading to increased biodiversity.

Question 6

Which of the following is a likely consequence of biological magnification in an aquatic food web?

Accepted Answer

Top predators accumulate higher concentrations of toxins than organisms at lower trophic levels.

Question 7

Which of the following is NOT a characteristic of the tundra biome?

Accepted Answer

High biodiversity and dense forests

Question 8

If two species compete for the same limited resource and their ecological niches overlap, what is the most likely outcome?

Accepted Answer

One species may outcompete the other, leading to competitive exclusion.

Question 9

Which of the following best describes the process of energy flow in an ecosystem?

Accepted Answer

Energy flows in one direction, from the sun to producers to consumers, and is eventually lost as heat.

Question 10

A graph shows the population growth of a species over time, leveling off at a certain point. Which ecological concept does this illustrate?

Accepted Answer

Carrying capacity

Question 11

Which of the following is a major threat to biodiversity worldwide?

Accepted Answer

Habitat destruction

Question 12

Which of the following aquatic zones is characterized by high light penetration and supports most photosynthetic organisms?

Accepted Answer

Photic zone

Question 13

Which of the following best describes the relationship between food chains and food webs?

Accepted Answer

Food webs consist of interconnected food chains.

Question 14

Which of the following is an example of an invasive species affecting a biological community?

Accepted Answer

Zebra mussels outcompeting native mussels in North American lakes

Question 15

Which of the following is NOT one of the three components of biodiversity?

Accepted Answer

Trophic diversity

Question 16

A researcher wants to display the change in population size of a fish species over a 10-year period. Which type of graph is most appropriate?

Accepted Answer

Line graph

Question 17

Which of the following best explains why sustainable development is important for human societies?

Accepted Answer

It balances human needs with the long-term health of ecosystems.

Question 18

Which of the following is a correct example of herbivory?

Accepted Answer

A caterpillar eating the leaves of a plant

Question 19

If climate change causes a significant increase in temperature and decrease in rainfall in a temperate grassland, which biome is it most likely to resemble over time?

Accepted Answer

Desert

Question 20

Which of the following best describes the role of an estuary in an aquatic ecosystem?

Accepted Answer

A region where freshwater mixes with saltwater, supporting high biodiversity

Ecosystems, Biomes, and Community Interactions: Foundations of Ecology

Study Guide - Practice Questions

Study Guide - Flashcards