$$r = \text{birthrate} - \text{death rate}$$

Question 1

Which of the following best describes the biosphere?

Accepted Answer

The portion of Earth that can sustain life and all its interactions.

Question 2

In the context of ecological organization, which level includes both living communities and their physical environment?

Accepted Answer

Ecosystem

Question 3

A group of deer living together in a forest is an example of which ecological level?

Accepted Answer

Population

Question 4

Which of the following is an abiotic factor that can affect an ecosystem?

Accepted Answer

Water availability

Question 5

What is the primary source of energy for most ecosystems?

Accepted Answer

Sunlight

Question 6

According to the ten-percent law, if a producer stores 10,000 kcal of energy, how much energy is available to the primary consumer?

Accepted Answer

$$1,000 	ext{ kcal}$$

Question 7

Which of the following organisms is classified as a detritivore?

Accepted Answer

Earthworm

Question 8

Which process in the water cycle involves water vapor turning into liquid water?

Accepted Answer

Condensation

Question 9

What is the role of bacteria in the nitrogen cycle?

Accepted Answer

They fix atmospheric nitrogen into compounds usable by living things.

Question 10

Which of the following best describes primary succession?

Accepted Answer

Succession that occurs where no soil previously existed, often starting with pioneer species.

Question 11

Which term refers to the dry weight of living tissue found within a trophic level?

Accepted Answer

Biomass

Question 12

What is the limiting nutrient in an ecosystem?

Accepted Answer

A nutrient that is scarce or cycles slowly, limiting primary productivity.

Question 13

Which population dispersion pattern is most likely observed in pine trees growing independently in a uniform environment?

Accepted Answer

Random dispersion

Question 14

If a population is given unlimited resources and protection from predators, which type of growth will it most likely exhibit?

Accepted Answer

Exponential growth

Question 15

Which equation correctly represents the growth rate of a population?

Accepted Answer

$$r = 	ext{birthrate} - 	ext{death rate}$$

Question 16

Which of the following is a density-independent factor affecting population size?

Accepted Answer

Weather

Question 17

Which type of symbiotic relationship is characterized by one organism benefiting while the other is neither helped nor harmed?

Accepted Answer

Commensalism

Question 18

What is coevolution?

Accepted Answer

Back and forth evolutionary adjustments between species.

Question 19

Which human activity is most directly responsible for increasing atmospheric carbon dioxide and contributing to global warming?

Accepted Answer

Burning fossil fuels

Question 20

Why are fertilizers important for crop growth?

Accepted Answer

They supply essential nutrients like nitrogen, phosphorus, and potassium.

Ecology: Interactions, Energy Flow, and Human Impact

Study Guide - Practice Questions