$$\text{Energy transferred} = \text{Energy at lower level} \times 0.10$$

Question 1

Which of the following best describes the concept of carrying capacity ($$K) in $$population ecology?

Accepted Answer

The maximum number of individuals that can be supported indefinitely by the resources available in a given environment.

Question 2

A population of rabbits grows rapidly until it reaches a plateau. Which equation best models this population growth?

Accepted Answer

Logistic growth equation: $$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 3

Which of the following is an example of a density-dependent factor affecting population size?

Accepted Answer

Competition for food among individuals of the same species.

Question 4

In a food web, which organism is most likely to be a primary consumer?

Accepted Answer

A grasshopper feeding on grass.

Question 5

Which of the following best illustrates mutualism in a community?

Accepted Answer

Bees pollinating flowers while obtaining nectar.

Question 6

Which equation represents the process of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 7

Which of the following is a consequence of biomagnification in an ecosystem?

Accepted Answer

Toxic substances accumulate at higher concentrations in organisms at higher trophic levels.

Question 8

Which term describes the role of an organism in its environment, including its interactions with other species?

Accepted Answer

Ecological niche

Question 9

A sudden increase in nutrient input into a lake causes rapid algal growth, followed by fish die-offs. This scenario is best described as:

Accepted Answer

Eutrophication

Question 10

Which of the following is a primary producer in an ecosystem?

Accepted Answer

Phytoplankton

Question 11

Which process is responsible for the conversion of atmospheric nitrogen ($$N_2) $$into a form usable by plants?

Accepted Answer

Nitrogen fixation

Question 12

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose.

Question 13

Which of the following is an example of a keystone species?

Accepted Answer

Sea otters maintaining kelp forest ecosystems by controlling sea urchin populations.

Question 14

Which equation best represents the energy transfer efficiency between trophic levels?

Accepted Answer

$$	ext{Energy transferred} = 	ext{Energy at lower level} 	imes 0.10$$

Question 15

Which of the following is a likely effect of introducing an invasive species into a community?

Accepted Answer

Disruption of native species interactions and possible decline of native populations.

Question 16

Which term describes the gradual change in species composition in an area following a disturbance?

Accepted Answer

Ecological succession

Question 17

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

Accepted Answer

A wildfire destroying a forest.

Question 18

Which of the following best describes the process of primary succession?

Accepted Answer

Colonization of bare rock by lichens and mosses, followed by soil formation and plant growth.

Question 19

Which of the following is a consequence of excessive phosphorus runoff into aquatic ecosystems?

Accepted Answer

Algal blooms leading to oxygen depletion and fish kills.

Question 20

Which of the following best describes the difference between a food chain and a food web?

Accepted Answer

A food chain shows a linear sequence of energy transfer, while a food web shows interconnected energy pathways.

Ecology: Population, Community, and Ecosystem Dynamics

Study Guide - Practice Questions