Question 1

What term describes the role of a species in its ecosystem, including its habitat, resource use, and interactions with other species?

Accepted Answer

Niche

Answer

Habitat

Answer

Biome

Answer

Population

Question 2

Which of the following biogeochemical cycles is primarily concerned with the movement of water through the environment?

Accepted Answer

Hydrological cycle

Answer

Phosphorus cycle

Answer

Carbon cycle

Answer

Nitrogen cycle

Question 3

What type of symbiotic relationship benefits one species while harming another?

Accepted Answer

Parasitism

Answer

Commensalism

Answer

Competition

Answer

Mutualism

Question 4

Which of the following is an example of an autotroph in an ecosystem?

Accepted Answer

A plant

Answer

A rabbit

Answer

A lion

Answer

A mushroom

Question 5

In an ecological pyramid, what is typically represented by the base of the pyramid?

Accepted Answer

Producers

Answer

Secondary consumers

Answer

Tertiary consumers

Answer

Decomposers

Question 6

What term describes the maximum population size that an environment can sustainably support?

Accepted Answer

Carrying capacity

Answer

Biological limit

Answer

Ecosystem balance

Answer

Population threshold

Question 7

Which process in an ecosystem involves the breakdown of organic matter into simpler substances by decomposers?

Accepted Answer

Decomposition

Answer

Nitrogen fixation

Answer

Respiration

Answer

Photosynthesis

Question 8

What is the primary source of energy for nearly all ecosystems on Earth?

Accepted Answer

The Sun

Answer

Chemical energy

Answer

Geothermal energy

Answer

Wind energy

Question 9

Which type of ecosystem is characterized by high levels of biodiversity and a warm, humid climate, typically found near the equator?

Accepted Answer

Tropical rainforest

Answer

Tundra

Answer

Desert

Answer

Savanna

Question 10

Which component of an ecosystem includes all living organisms and their interactions?

Accepted Answer

Biotic factors

Answer

Ecosystem services

Answer

Abiotic factors

Answer

Food webs

Question 11

Which of the following best describes a keystone species in an ecosystem?

Accepted Answer

A species that has a disproportionately large effect on its environment relative to its abundance

Answer

Any species that is the most numerous in an ecosystem

Answer

A species that can survive in multiple habitats

Answer

A species that is at the top of the food chain

Question 12

What is primary succession?

Accepted Answer

The process of ecological change that occurs on surfaces where no soil exists

Answer

The migration of species to a new habitat

Answer

The formation of soil from organic matter

Answer

The regrowth of an ecosystem after a fire

Question 13

What role do decomposers play in an ecosystem?

Accepted Answer

They break down dead organic matter and recycle nutrients back into the soil

Answer

They compete with primary consumers for food

Answer

They produce energy through photosynthesis

Answer

They are at the top of the food chain

Question 14

What is the primary energy source for most ecosystems on Earth?

Accepted Answer

The Sun

Answer

Wind energy

Answer

Geothermal energy

Answer

Nuclear energy

Question 15

Which of the following is an example of a biotic factor in an ecosystem?

Accepted Answer

Plants in a forest

Answer

Water availability

Answer

Temperature

Answer

Soil composition

Question 16

What is the primary purpose of an ecological niche?

Accepted Answer

To describe the role and position a species has within its environment

Answer

To indicate the dietary preferences of a species

Answer

To identify the geographical location of a species

Answer

To measure the population size of a species

Question 17

What is biomass in the context of an ecosystem?

Accepted Answer

The total mass of all living organisms in a given area

Answer

The amount of energy stored in sunlight

Answer

The total volume of water in an ecosystem

Answer

The mass of non-living matter in the environment

Question 18

What is an ecosystem's carrying capacity?

Accepted Answer

The maximum number of individuals of a species that an environment can support sustainably

Answer

The rate at which individuals reproduce in a population

Answer

The minimum amount of resources needed for survival

Answer

The total diversity of species in an ecosystem

Question 19

Which factor is primarily responsible for the seasonal changes observed in ecosystems?

Accepted Answer

The tilt of the Earth's axis

Answer

The distance of Earth from the Sun

Answer

The Earth's revolution around the Sun

Answer

The rotation of Earth on its axis

Question 20

What is the primary function of producers in an ecosystem?

Accepted Answer

To convert solar energy into chemical energy through photosynthesis

Answer

To provide shelter and habitat for other organisms

Answer

To decompose dead organic matter

Answer

To consume other organisms for energy

Question 21

Which of the following best describes a keystone species in an ecosystem?

Accepted Answer

A species that has a disproportionately large effect on its environment relative to its abundance

Answer

An invasive species that disrupts the ecosystem

Answer

A species that is rare and difficult to find

Answer

A species that is at the top of the food chain

Question 22

What role do decomposers play in an ecosystem?

Accepted Answer

They break down dead organic matter and recycle nutrients back into the soil

Answer

They are the top predators in the food web

Answer

They compete with primary producers for resources

Answer

They produce energy through photosynthesis

Question 23

Which of the following best describes the concept of biodiversity?

Accepted Answer

The variety of life in a particular habitat or ecosystem

Answer

The total biomass of an ecosystem

Answer

The geographic distribution of species

Answer

The number of species in a specific area

Question 24

What is primary succession?

Accepted Answer

The process of community development in an area without soil, such as after a volcanic eruption

Answer

The succession of species in a pond over several seasons

Answer

The development of ecosystems in urban areas

Answer

The gradual process of recovery after a forest fire

Question 25

What is an example of a density-dependent factor that affects population growth?

Accepted Answer

Availability of food resources

Answer

Natural disasters

Answer

The amount of space available

Answer

Seasonal changes in weather

Question 26

Which of the following best defines an abiotic factor in an ecosystem?

Accepted Answer

Non-living chemical and physical components of the environment

Answer

The genetic variation within a species

Answer

Living organisms that interact within the ecosystem

Answer

The interactions between species in a food web

Question 27

What is the primary function of photosynthesis in an ecosystem?

Accepted Answer

To convert solar energy into chemical energy stored in glucose

Answer

To provide oxygen for cellular respiration

Answer

To break down organic materials into nutrients

Answer

To release carbon dioxide into the atmosphere

Question 28

Which of the following describes a trophic level in an ecosystem?

Accepted Answer

A position in the food chain characterized by the flow of energy

Answer

The physical space an organism occupies

Answer

The amount of biodiversity in an area

Answer

The genetic makeup of a species

Question 29

What is the significance of an ecological niche?

Accepted Answer

It describes how an organism fits into its environment, including its role and interactions

Answer

It is a synonym for habitat diversity

Answer

It indicates the largest population size an area can support

Answer

It refers to the physical space an organism occupies

Question 30

What is the primary cause of ground-level ozone formation?

Accepted Answer

Chemical reactions between sunlight and pollutants such as volatile organic compounds (VOCs)

Answer

Ozone depletion from CFCs

Answer

High humidity levels in the atmosphere

Answer

Natural volcanic eruptions

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