Question 1

Which of the following best describes the difference between a community and an ecosystem?

Accepted Answer

A community includes all the populations of different species in an area, while an ecosystem includes both the community and the abiotic factors.

Question 2

Which of the following is an example of an abiotic factor in an Australian grassland ecosystem?

Accepted Answer

Soil pH level

Question 3

A food chain in a pond ecosystem is: algae → mosquito larvae → small fish → heron. If the population of small fish drastically decreases due to pollution, what is the most likely immediate effect on the ecosystem?

Accepted Answer

The mosquito larvae population will increase due to reduced predation.

Question 4

Which equation correctly represents the process of photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 5

Which of the following organisms is correctly matched with its trophic level in a food web?

Accepted Answer

Mushroom – Decomposer

Question 6

A scientist is using a dichotomous key to identify an unknown insect. Which of the following best describes how a dichotomous key is used?

Accepted Answer

By following a series of paired statements that lead to the correct identification based on observable features.

Question 7

Which of the following is the correct order of taxonomic classification from broadest to most specific?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 8

Which of the following best explains why scientific names are preferred over common names in biology?

Accepted Answer

Scientific names are unique and universally accepted, reducing confusion across languages and regions.

Question 9

Which of the following is an example of a human activity that can disrupt energy flow in a food web?

Accepted Answer

Overfishing a top predator species in a marine ecosystem

Question 10

A cane toad is introduced into an Australian ecosystem. Which of the following is a likely ecological consequence?

Accepted Answer

Native predators may decline if they are poisoned by eating cane toads.

Question 11

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They break down dead organic matter, returning nutrients to the soil.

Question 12

Which of the following is a correct example of a scientific name written according to binomial nomenclature?

Accepted Answer

Homo sapiens

Question 13

Which of the following is NOT a rule for constructing a dichotomous key?

Accepted Answer

Use subjective language such as 'large' or 'beautiful'.

Question 14

Which of the following best describes the process of cellular respiration?

Accepted Answer

It converts glucose and oxygen into carbon dioxide, water, and energy.

Question 15

A food web shows that a frog eats insects, and a snake eats frogs. If insect populations are reduced by pesticide use, what is the most likely effect on the snake population?

Accepted Answer

The snake population will decrease due to less available food.

Question 16

Which of the following is a correct pairing of a vertebrate class and a characteristic?

Accepted Answer

Amphibians – Lay eggs in water and undergo metamorphosis

Question 17

Which of the following is a plausible consequence of removing a top predator from an ecosystem?

Accepted Answer

An increase in the population of herbivores, leading to overgrazing.

Question 18

Which of the following best explains why dichotomous keys are considered universal tools for scientists?

Accepted Answer

They use standardized, objective characteristics that can be applied globally.

Question 19

Which of the following is an example of a positive human impact on an ecosystem?

Accepted Answer

Restoring wetlands to provide habitat for native species.

Question 20

Which of the following best describes an omnivore?

Accepted Answer

An organism that eats both plants and animals.

Ecology, Classification, and Human Impacts: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards