Ecosystems and Interactions: Learn about the Interconnectedness of Living Things

Question 1

Which characteristic is **NOT** found in an ecosystem?

Accepted Answer

Presence of a single organism type

Answer

Variety of living organisms

Answer

Energy flow

Answer

Nutrient cycling

Question 2

Which of the following does **not** influence the carrying capacity of an ecosystem?

Accepted Answer

Level of pollution

Answer

Amount of food available

Answer

Rate of population growth

Answer

Number of predators

Question 3

Describe ecological succession and give an example of how it might happen in nature.

Accepted Answer

Ecological succession is the gradual change in the types of living things in an ecosystem over time.

Answer

Ecological succession is the process of adding new species to an ecosystem.

Answer

Ecological succession is the process of making an ecosystem more diverse.

Answer

Ecological succession is the process of humans changing an ecosystem.

Question 4

Which of the following is NOT a living component of an ecosystem?

Accepted Answer

Rocks

Answer

Plants

Answer

Animals

Question 5

What is a living part of an ecosystem?

Accepted Answer

Grass

Answer

Sunlight

Answer

Water

Answer

Temperature

Question 6

In a food chain, which organism is responsible for producing its own food using sunlight?

Accepted Answer

Plant

Answer

Herbivore

Answer

Carnivore

Answer

Decomposer

Question 7

Which of the following is NOT part of an ecosystem?

Accepted Answer

The Moon

Answer

Plants and animals

Answer

Sunlight, air, and water

Answer

Energy

Question 8

Which of these is NOT a living part of an ecosystem?

Accepted Answer

Temperature

Answer

Plants

Answer

Animals

Question 9

Which of these is a living part of an ecosystem?

Accepted Answer

Grass

Answer

Sunlight

Answer

Water

Answer

Temperature

Question 10

Which of the following is NOT a living part of an ecosystem?

Accepted Answer

Temperature

Answer

Plants

Answer

Animals

Answer

Bacteria

Question 11

What is the process by which energy moves through an ecosystem called?

Accepted Answer

Energy flow

Answer

Nutrient cycle

Answer

Food chain

Answer

Photosynthesis

Question 12

Which of the following is NOT a type of interaction between organisms in an ecosystem?

Accepted Answer

Communication

Answer

Predation

Answer

Competition

Answer

Symbiosis

Question 13

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

Accepted Answer

The sun

Answer

Fossil fuels

Answer

Wind

Answer

Water

Question 14

Which of the following is the first level in a food chain?

Accepted Answer

Plants

Answer

Herbivores

Answer

Carnivores

Answer

Apex predators

Question 15

What happens to most of the energy transferred from one level of a food chain to the next?

Accepted Answer

It is lost as heat.

Answer

It is passed on to the next level.

Answer

It is stored as fat.

Answer

It is converted into nutrients.

Question 16

Which of the following is a characteristic of a food web?

Accepted Answer

It shows all possible feeding relationships in an ecosystem.

Answer

It is a simplified representation of a food chain.

Answer

It only includes interactions between producers and consumers.

Answer

It does not change over time.

Question 17

What is the main role of decomposers in an ecosystem?

Accepted Answer

To break down dead organisms and recycle nutrients

Answer

To produce food for other organisms

Answer

To control populations of other organisms

Answer

To provide shelter for other organisms

Question 18

What does the term 'carrying capacity' mean in ecology?

Accepted Answer

The maximum population size that an environment can support indefinitely

Answer

The minimum population size required for a species to survive

Answer

The rate at which a population grows

Answer

The number of individuals that can live in a particular habitat

Question 19

What is the primary role of producers in a food chain?

Accepted Answer

To produce their own food

Answer

To consume other organisms

Answer

To decompose organic matter

Answer

To regulate population growth

Question 20

How does energy flow through an ecosystem?

Accepted Answer

From producers to consumers to decomposers

Answer

From decomposers to producers to consumers

Answer

Randomly throughout the ecosystem

Answer

Energy is not transferred within ecosystems

Question 21

What is the term for the process by which nutrients are cycled through an ecosystem?

Accepted Answer

Nutrient cycle

Answer

Energy cycle

Answer

Water cycle

Answer

Carbon cycle

Question 22

Which organism is a secondary consumer in the following food chain: grass -> grasshopper -> frog -> snake -> hawk?

Accepted Answer

Snake

Answer

Grasshopper

Answer

Frog

Answer

Hawk

Question 23

What is a keystone species in an ecosystem?

Accepted Answer

A species that has a disproportionately large impact on its environment

Answer

A species that is not found in any other ecosystem

Answer

A species that is at the bottom of the food chain

Answer

A species that is at the top of the food chain

Question 24

An ecosystem consists of:

Accepted Answer

Living organisms and their physical surroundings

Answer

Living organisms only

Answer

Non-living things only

Answer

Climate only

Question 25

The main source of energy for most ecosystems on Earth is:

Accepted Answer

Sunlight

Answer

Wind

Answer

Water

Answer

Geothermal heat

Question 26

A linear sequence of organisms through which energy and nutrients pass is called a:

Accepted Answer

Food chain

Answer

Food web

Answer

Trophic level

Answer

Ecological pyramid

Question 27

The process by which dead organisms are broken down and returned to the soil is called:

Accepted Answer

Decomposition

Answer

Respiration

Answer

Photosynthesis

Answer

Transpiration

Question 28

The interconnected network of food chains within an ecosystem is known as a:

Accepted Answer

Food web

Answer

Food chain

Answer

Trophic level

Answer

Ecological pyramid

Question 29

Which of the following is a primary consumer?

Accepted Answer

Rabbit

Answer

Grass

Answer

Fox

Answer

Owl

Question 30

Energy in an ecosystem is eventually:

Accepted Answer

Lost as heat

Answer

Stored in plants

Answer

Converted to matter

Answer

Transferred to decomposers

Question 31

A mutually beneficial relationship between two species is known as:

Accepted Answer

Mutualism

Answer

Predation

Answer

Competition

Answer

Parasitism

Question 32

Which organisms play a crucial role in breaking down dead organisms and recycling nutrients?

Accepted Answer

Decomposers

Answer

Producers

Answer

Consumers

Answer

Scavengers

Question 33

Which of the following is NOT a part of an ecosystem?

Accepted Answer

The weather

Answer

Living organisms

Answer

Non-living factors

Answer

The way living organisms interact with each other

Question 34

What is the name for the flow of energy in a food chain?

Accepted Answer

Energy flow

Answer

Nutrient cycle

Answer

Energy pyramid

Answer

Food web

Question 35

What do decomposers do in an ecosystem?

Accepted Answer

Break down dead organisms

Answer

Produce their own food

Answer

Consume other organisms

Answer

Convert toxic chemicals into harmless substances

Question 36

Which of the following is a sign of a stable ecosystem?

Accepted Answer

Lots of different types of living organisms

Answer

Rapid growth in the number of living organisms

Answer

Changes in the amount of food and water available

Answer

Few interactions between different types of living organisms

Question 37

What is the negative impact of human activities on ecosystems called?

Accepted Answer

Pollution

Answer

Conservation

Answer

Deforestation

Answer

Bioremediation

Question 38

Which of the following is an example of a renewable resource?

Accepted Answer

Solar energy

Answer

Fossil fuels

Answer

Coal

Answer

Natural gas

Question 39

What is the name of the diagram that shows how organisms in an ecosystem are connected by their feeding relationships?

Accepted Answer

Food web

Answer

Energy pyramid

Answer

Nutrient cycle

Answer

Trophic level

Question 40

Which of the following is a producer organism in a food chain?

Accepted Answer

Plants

Answer

Animals

Answer

Fungi

Answer

Bacteria

Question 41

What is the process by which nitrogen is changed into a form that plants can use?

Accepted Answer

Nitrogen fixation

Answer

Nitrification

Answer

Denitrification

Answer

Ammonification

Question 42

Which of the following is NOT a key component of an ecosystem?

Accepted Answer

Money

Answer

Living organisms (plants, animals, microorganisms)

Answer

Non-living factors (water, air, soil, sunlight)

Answer

Time

Question 43

In a food chain, what is the primary role of producers?

Accepted Answer

Produce their own food using sunlight

Answer

Consume other organisms

Answer

Break down dead organisms

Answer

Filter nutrients from the air

Question 44

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

Accepted Answer

Animals

Answer

Temperature

Answer

Water

Answer

Oxygen

Question 45

What is the process by which plants utilize sunlight to create their own food?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Decomposition

Answer

Transpiration

Question 46

What is the term for the complex network of interconnected food chains within an ecosystem?

Accepted Answer

Food web

Answer

Food cycle

Answer

Nutrient pyramid

Answer

Trophic level

Question 47

In a food chain, which organism is considered a primary consumer?

Accepted Answer

Herbivore

Answer

Grass

Answer

Carnivore

Answer

Omnivore

Question 48

What is the primary function of decomposers within an ecosystem?

Accepted Answer

Breaking down dead organisms and returning nutrients to the environment

Answer

Producing food for other organisms

Answer

Filtering pollutants from the air

Answer

Providing shelter for other organisms

Question 49

What is the process by which green plants use sunlight to create food known as?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Decomposition

Answer

Transpiration

Question 50

Which of the following is NOT a part of a food chain?

Accepted Answer

Light

Answer

Producer

Answer

Consumer

Answer

Decomposer

Question 51

What is the primary role of decomposers in an ecosystem?

Accepted Answer

To decompose dead plants and animals, returning nutrients to the soil

Answer

To produce food for other organisms

Answer

To provide shelter for animals

Answer

To regulate the temperature of an ecosystem

Question 52

What is the term for the connected web of food chains in an ecosystem?

Accepted Answer

Food web

Answer

Trophic level

Answer

Energy pyramid

Answer

Nutrient cycle

Question 53

What is the correct flow of energy in an ecosystem?

Accepted Answer

Sun → Plants → Animals → Decomposers

Answer

Producers → Consumers → Sun → Decomposers

Answer

Sun → Decomposers → Producers → Consumers

Answer

Decomposers → Producers → Consumers → Sun

Question 54

What is the process by which water becomes a vapor and enters the atmosphere?

Accepted Answer

Evaporation

Answer

Condensation

Answer

Precipitation

Answer

Transpiration

Question 55

What is the process by which essential nutrients are released from rocks and soil?

Accepted Answer

Weathering

Answer

Erosion

Answer

Decomposition

Answer

Photosynthesis

Question 56

Which of the following is NOT a key component of an ecosystem?

Accepted Answer

Technology

Answer

Living organisms

Answer

Non-living things

Question 57

What process allows plants to convert sunlight into energy?

Accepted Answer

Photosynthesis

Answer

Respiration

Question 58

Which of the following is a primary consumer in a food chain?

Accepted Answer

Rabbit

Answer

Grass

Question 59

What is the role of decomposers in an ecosystem?

Accepted Answer

To break down dead organisms

Answer

To produce oxygen

Question 60

Which human activity is most likely to have a negative impact on an ecosystem?

Accepted Answer

Pollution

Answer

Recycling

Question 61

What is the term for the transfer of energy from one trophic level to the next?

Accepted Answer

Energy flow

Answer

Energy conversion

Question 62

Which of these is NOT a component of an ecosystem?

Accepted Answer

Gravity

Answer

Living organisms

Answer

Non-living factors

Answer

Energy flow

Question 63

At the start of a food chain, organisms like plants are called:

Accepted Answer

Producers

Answer

Consumers

Answer

Decomposers

Answer

Herbivores

Question 64

Which process changes inorganic matter into organic molecules?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Decomposition

Answer

Combustion