Ecosystems: Dive into the Interconnected World of Living Things

Question 1

Which of these human activities **does not** harm ecosystems?

Accepted Answer

Recycling paper and plastic

Answer

Cutting down forests

Answer

Putting pollution into the air and water

Answer

Making the climate change

Question 2

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

Accepted Answer

A city

Answer

A forest

Answer

A desert

Answer

An ocean

Question 3

What is the primary role of producers in an ecosystem?

Accepted Answer

To create their own food using sunlight

Answer

To break down dead organisms

Answer

To consume other organisms

Answer

To provide shelter for other organisms

Question 4

Which of the following interactions between two organisms benefits both of them?

Accepted Answer

Mutualism

Answer

Commensalism

Answer

Parasitism

Answer

Predation

Question 5

What is a food chain?

Accepted Answer

A group of organisms that eat each other in a specific order

Answer

A list of the different types of organisms found in an ecosystem

Answer

A community of organisms that depend on each other for food

Answer

A type of ecosystem found in water

Question 6

What is the main difference between biotic and abiotic factors in an ecosystem?

Accepted Answer

Biotic factors are living organisms, while abiotic factors are non-living.

Answer

Biotic factors are non-living, while abiotic factors are living organisms.

Answer

Biotic factors interact with each other, while abiotic factors do not.

Answer

Abiotic factors interact with each other, while biotic factors do not.

Question 7

What is NOT a part of an ecosystem?

Accepted Answer

Human actions

Answer

Living things

Answer

Non-living things

Answer

Energy transfer

Question 8

What do producers do in an ecosystem?

Accepted Answer

Make food using sunlight

Answer

Eat other organisms

Answer

Break down organic matter

Answer

Control the flow of water

Question 9

Which ecosystem is known for its vast, open areas with few trees?

Accepted Answer

Grassland

Answer

Forest

Answer

Desert

Answer

Ocean

Question 10

What do we call the relationship where two organisms help each other?

Accepted Answer

Symbiosis

Answer

Competition

Answer

Predation

Answer

Parasitism

Question 11

Which ecosystem is home to the greatest variety of plants and animals?

Accepted Answer

Tropical rainforest

Answer

Desert

Answer

Grassland

Answer

Ocean

Question 12

What's the main idea we learned about ecosystems in this unit?

Accepted Answer

Ecosystems are connected communities of living things and their surroundings

Answer

People don't affect ecosystems

Answer

All ecosystems are alike

Answer

Plants are the most important part of an ecosystem

Question 13

What is NOT a part of an ecosystem?

Accepted Answer

Human-made structures (buildings, roads)

Answer

Living things (plants, animals)

Answer

Non-living things (air, water, soil)

Answer

Interactions between living things and their environment

Question 14

How do plants make their own food?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Decomposition

Answer

Transpiration

Question 15

Which of these shows a food chain?

Accepted Answer

Grass → Deer → Wolves

Answer

Water → Plants → Fish

Answer

Sun → Plants → Animals

Answer

Rocks → Soil → Trees

Question 16

What do decomposers do in an ecosystem?

Accepted Answer

Break down dead plants and animals

Answer

Produce oxygen

Answer

Eat plants

Answer

Clean water

Question 17

Which is the largest ecosystem on Earth?

Accepted Answer

Ocean

Answer

Tropical rainforest

Answer

Tundra

Answer

Grassland

Question 18

What is the special word for all the different types of living things in an ecosystem?

Accepted Answer

Biodiversity

Answer

Carrying capacity

Answer

Population density

Answer

Species richness

Question 19

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

Accepted Answer

Rocks

Answer

Plants

Answer

Animals

Answer

Microorganisms

Question 20

Who plays a crucial role in breaking down organic matter and returning nutrients to the soil?

Accepted Answer

Decomposers

Answer

Producers

Answer

Consumers

Answer

Symbionts

Question 21

What do we call the specific area where an organism lives and interacts with other organisms?

Accepted Answer

Habitat

Answer

Niche

Answer

Population

Answer

Community

Question 22

Which human actions can harm ecosystems?

Accepted Answer

Cutting down forests

Answer

Planting trees

Answer

Reducing pollution

Answer

Recycling trash

Question 23

What do food chains show us?

Accepted Answer

How energy moves through different organisms

Answer

Which animals eat other animals

Answer

The number of organisms in an ecosystem

Answer

How organisms compete for resources

Question 24

How do bacteria help plants get the nitrogen they need?

Accepted Answer

They convert nitrogen gas into a form plants can use.

Answer

They convert ammonia into nitrates.

Answer

They convert nitrates into nitrogen gas.

Answer

They consume nitrogen gas.

Question 25

Which of the following is NOT an interaction between living things in an ecosystem?

Accepted Answer

Abiotic

Answer

Competition

Answer

Predation

Answer

Mutualism

Question 26

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

Accepted Answer

Only includes trees

Answer

Has living and nonliving things

Answer

Is self-contained

Answer

Is constantly changing

Question 27

Which kind of ecosystem has tall trees, lots of rain, and many different kinds of animals?

Accepted Answer

Forest

Answer

Desert

Answer

Grassland

Answer

Tundra

Question 28

What do decomposers do in an ecosystem?

Accepted Answer

Break down dead plants and animals into smaller pieces

Answer

Make food for other animals

Answer

Build homes for other organisms

Answer

Control the number of other animals

Question 29

Which type of interaction between living things is called symbiotic?

Accepted Answer

Helping each other survive

Answer

Eating each other

Answer

Competing for the same resources

Answer

Living close to each other without affecting each other

Question 30

What is the purpose of a food web?

Accepted Answer

To show how living things are connected in an ecosystem

Answer

To measure how much food each animal eats

Answer

To figure out how many animals there are

Answer

To predict what will happen if the environment changes

Question 31

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

Accepted Answer

Rocks

Answer

Animals

Answer

Plants

Answer

Water

Question 32

Food chains show the transfer of energy through different organisms. What do food webs show?

Accepted Answer

The many ways energy flows through an ecosystem

Answer

The number of organisms in an ecosystem

Answer

The types of animals in an ecosystem

Answer

The role of plants in an ecosystem

Question 33

What is the job of decomposers in an ecosystem?

Accepted Answer

To break down dead plants and animals

Answer

To make food for other animals

Answer

To provide homes for other organisms

Answer

To regulate the population of predators

Question 34

Which type of ecosystem is always cold and has frozen soil?

Accepted Answer

Tundra

Answer

Forest

Answer

Desert

Answer

Grassland

Question 35

What is a limiting factor?

Accepted Answer

A factor that limits the growth and survival of organisms

Answer

A factor that increases the growth and survival of organisms

Answer

A factor that has no impact on organisms

Answer

A factor that is constant over time

Question 36

What is the greenhouse effect?

Accepted Answer

The warming of the Earth's atmosphere due to gases

Answer

The cooling of the Earth's atmosphere due to oxygen

Answer

The process by which plants absorb carbon dioxide

Answer

The process by which animals release carbon dioxide

Question 37

How do decomposers help replenish nutrients in an ecosystem?

Accepted Answer

They break down dead plants and animals, releasing nutrients back into the environment.

Answer

They create nutrients from sunlight and water.

Answer

They consume living organisms and pass nutrients along the food chain.

Question 38

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

Accepted Answer

Human-made structures (buildings, roads)

Answer

Living organisms (plants, animals, microorganisms)

Answer

Non-living things (sunlight, water, soil)

Answer

Decomposers (organisms that break down dead organisms)

Question 39

A food chain shows the path of energy flow in an ecosystem. Which of the following is a correct description of a food chain?

Accepted Answer

A straight line of organisms, where each organism eats the one below it and is eaten by the one above it.

Answer

A tangled web of organisms that are all connected through feeding relationships.

Answer

A group of organisms that live in the same place and compete for the same food.

Answer

An organism that eats many different types of food.

Question 40

Which of these describes a mutualistic relationship in an ecosystem?

Accepted Answer

A clownfish living among the stinging tentacles of a sea anemone

Accepted Answer

Bacteria living in the root nodules of bean plants

Answer

A fox hunting a rabbit for food

Answer

A tapeworm living inside the intestine of a human

Question 41

What is a habitat and why is it crucial for living organisms?

Accepted Answer

A habitat is the specific environment where an organism naturally resides, providing essential resources like food, water, shelter, and other necessities for its survival.

Answer

A habitat is a collection of organisms of the same species coexisting in a particular location.

Answer

A habitat refers to the specific role or function an organism fulfills within an ecosystem.

Question 42

How does natural selection help species adapt to their environment?

Accepted Answer

It favors traits that help organisms survive and reproduce in their environment.

Answer

It removes harmful traits from the population.

Answer

It creates new species.

Answer

It makes all members of a species identical.

Question 43

Which of the following is a common characteristic of desert ecosystems?

Accepted Answer

Extreme temperature fluctuations between day and night

Answer

Abundant rainfall

Answer

Dense forests

Answer

High humidity

Question 44

In an ecosystem, what is the term for a non-living element, like sunlight or water?

Accepted Answer

Abiotic factor

Answer

Biotic factor

Answer

Producer

Answer

Consumer

Question 45

Which of the following is NOT a stage in ecological succession?

Accepted Answer

Decomposition

Answer

Pioneer species

Answer

Climax community

Answer

Secondary succession

Question 46

In an ecosystem, which group of organisms transfers energy to the next group in this order: producers, consumers, or decomposers?

Accepted Answer

Producers to consumers to decomposers

Answer

Consumers to producers to decomposers

Answer

Decomposers to producers to consumers

Question 47

How do nutrient cycles, like the nitrogen cycle, support the well-being of ecosystems?

Accepted Answer

They ensure plants have the nutrients they need to grow.

Answer

They remove harmful waste from ecosystems.

Answer

They regulate temperature and pH levels in ecosystems.

Answer

Nutrient cycles have no effect on ecosystem health.

Question 48

Which factor is not considered part of an ecosystem?

Accepted Answer

Bicycle

Answer

Plant life

Answer

Water source

Answer

Living organisms

Question 49

What do we call the interactions between organisms within an ecosystem?

Accepted Answer

Biotic interactions

Answer

Chemical reactions

Answer

Geologic processes

Answer

Weather patterns

Question 50

Which ecosystem type is known for tall trees, dense vegetation, and abundant rainfall?

Accepted Answer

Forest

Answer

Desert

Answer

Tundra

Answer

Grassland

Question 51

What is the primary role of decomposers in an ecosystem?

Accepted Answer

Breaking down dead organisms and releasing nutrients

Answer

Producing food for consumers

Answer

Providing shelter for animals

Answer

Regulating the climate

Question 52

Which of these is an abiotic factor that influences ecosystems?

Accepted Answer

Temperature

Answer

Mutualism

Answer

Migration

Answer

Predation

Question 53

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

Accepted Answer

Sunlight

Answer

Wind patterns

Answer

Geothermal heat

Answer

Fossil fuels

Question 54

Which of the following describes a type of food chain?

Accepted Answer

Predator-prey relationship

Answer

Nitrogen cycle

Answer

Water cycle

Answer

Carbon cycle

Question 55

What term describes the specific location where an organism lives and obtains its resources?

Accepted Answer

Habitat

Answer

Ecosystem

Answer

Niche

Answer

Biome

Question 56

Which of these poses a threat to the stability of ecosystems?

Accepted Answer

Pollution

Answer

Predation

Answer

Competition

Answer

Symbiosis