Ecosystems and Interdependence: Interactive Learning Quizzes for Year 9 Science

Question 1

How do lions and zebras depend on each other in a savanna ecosystem?

Accepted Answer

Lions hunt and eat zebras, showing a predator-prey relationship.

Answer

Zebras provide shelter and protection for lions, creating a mutually beneficial relationship.

Answer

Lions and zebras compete for the same limited resources, such as water and grazing land.

Answer

Lions have no impact on the survival or number of zebras in the savanna.

Question 2

What is the primary source of energy for most ecosystems?

Accepted Answer

The sun

Answer

Fossil fuels

Answer

Chemical energy

Answer

Electrical energy

Question 3

Which of the following is a living component of an ecosystem?

Accepted Answer

Plants

Answer

Soil

Answer

Water

Answer

Temperature

Question 4

What is the process by which organisms change and adapt to their surroundings called?

Accepted Answer

Natural selection

Answer

Symbiosis

Answer

Predation

Answer

Competition

Question 5

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

Accepted Answer

Weather

Answer

Producers

Answer

Consumers

Answer

Decomposers

Question 6

What is the term for the interconnected network of organisms in an ecosystem through which energy and nutrients flow?

Accepted Answer

Food web

Answer

Nutrient cycle

Answer

Energy pyramid

Answer

Ecological niche

Question 7

Which of the following organisms is a producer in an ecosystem, meaning it makes its own food from sunlight?

Accepted Answer

Tree

Answer

Lion

Answer

Tiger

Answer

Eagle

Question 8

What is the shape of the energy pyramid, a graphical representation showing the amount of energy at each level of an ecosystem?

Accepted Answer

Triangle

Answer

Rectangle

Answer

Circle

Answer

Square

Question 9

Which of the following statements about interdependence in ecosystems is true?

Accepted Answer

All living organisms rely on each other for survival.

Answer

Organisms do not depend on each other for survival.

Answer

Organisms can survive independently of their environment.

Answer

Only plants and animals are interdependent.

Question 10

How do decomposers contribute to the functioning of an ecosystem?

Accepted Answer

They break down dead organisms, releasing nutrients back into the environment.

Answer

They produce food for other organisms.

Answer

They create habitats for other organisms.

Answer

They help control populations of other organisms.

Question 11

In a food chain, energy flows from:

Accepted Answer

Producers (plants) to consumers (animals)

Answer

Consumers (animals) to producers (plants)

Answer

Decomposers (bacteria) to producers (plants)

Answer

Producers (plants) to decomposers (bacteria)

Question 12

Which organism in a food chain eats plants?

Accepted Answer

Grasshopper

Answer

Snake

Answer

Lion

Answer

Bacteria

Question 13

What is the main role of producers in an ecosystem?

Accepted Answer

To make food using sunlight (photosynthesis)

Answer

To eat other organisms

Answer

To break down dead organisms

Answer

To regulate the number of organisms in the ecosystem

Question 14

Which type of relationship is it when two organisms benefit from living together?

Accepted Answer

Mutualism

Answer

Predation

Answer

Competition

Answer

Commensalism

Question 15

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

Accepted Answer

To produce their own food from inorganic matter

Answer

To consume other organisms

Answer

To decompose dead organisms

Answer

To regulate the population of other organisms

Question 16

What is the term for a diagram that shows the energy levels at each trophic level in an ecosystem?

Accepted Answer

Energy pyramid

Answer

Food chain

Answer

Food web

Answer

Nutrient cycle

Question 17

What is the term for the variety of different species found in an ecosystem?

Accepted Answer

Biodiversity

Answer

Abundance

Answer

Population density

Answer

Richness

Question 18

In an ecosystem, which organism is classified as a producer?

Accepted Answer

Grass

Answer

Mushroom

Answer

Lion

Answer

Snake

Question 19

Which process enables plants to convert sunlight into usable energy?

Accepted Answer

Photosynthesis

Answer

Predation

Answer

Respiration

Answer

Decomposition

Question 20

Identify the primary consumer in the following list:

Accepted Answer

Rabbit

Answer

Hawk

Answer

Grass

Answer

Bacteria

Question 21

Which term accurately describes the feeding relationships between organisms within an ecosystem?

Accepted Answer

Food chain

Answer

Ecosystem

Answer

Habitat

Answer

Population

Question 22

In an ecosystem, what is the primary function of decomposers?

Accepted Answer

Breaking down organic matter

Answer

Producing food

Answer

Consuming plants

Answer

Releasing oxygen

Question 23

Identify the ultimate source of energy for most ecosystems on Earth:

Accepted Answer

Sun

Answer

Wind

Answer

Water

Answer

Plants

Question 24

Which of these is NOT a type of symbiotic relationship, where two species interact closely?

Accepted Answer

Competition

Answer

Mutualism

Answer

Commensalism

Answer

Parasitism

Question 25

In a food web, if the population of a predator decreases, which organism would be directly impacted?

Accepted Answer

Prey of the predator

Answer

Producer of the predator

Answer

Decomposer of the predator

Answer

Scavenger of the predator

Question 26

Which of the following consequences of deforestation on ecosystem stability is correct?

Accepted Answer

Decreased carbon storage

Answer

Increased biodiversity

Answer

Reduced soil erosion

Answer

Enhanced nutrient cycling

Question 27

What elements are NOT typically found in an ecosystem?

Accepted Answer

Artificial buildings

Answer

Producers

Answer

Consumers

Answer

Decomposers

Question 28

In a food chain, which organism is always the starting point?

Accepted Answer

Producer

Answer

Herbivore

Answer

Carnivore

Answer

Omnivore

Question 29

What is the primary role of decomposers in the ecosystem?

Accepted Answer

Breaking down deceased organisms into simpler compounds

Answer

Creating food for other organisms

Answer

Capturing energy from the sun

Answer

Consuming other animals

Question 30

Which type of relationship involves two organisms living in close association, benefiting each other?

Accepted Answer

Mutualism

Answer

Predator-prey

Answer

Competition

Answer

Commensalism

Question 31

What term describes the complex network of feeding connections within an ecosystem?

Accepted Answer

Food web

Answer

Food chain

Answer

Biosphere

Answer

Habitat

Question 32

What is the main energy source for most living things on Earth?

Accepted Answer

Sunlight

Answer

Electricity

Answer

Fossil fuels

Answer

Wind

Question 33

How does camouflage, a common adaptation in ecosystems, enhance the survival of organisms? Provide specific examples from different biomes.

Accepted Answer

Camouflage allows organisms to blend with their surroundings, making them less visible to predators and prey, thus increasing their chances of survival.

Answer

Camouflage helps organisms regulate their body temperature in extreme environments.

Answer

Camouflage enables organisms to communicate with each other and attract mates.

Answer

Camouflage has no significant impact on the survival and success of organisms within ecosystems.

Question 34

In a food chain, which organism is **always** at the first trophic level?

Accepted Answer

Producer

Answer

Primary consumer

Answer

Secondary consumer

Answer

Tertiary consumer

Question 35

Which type of organism can make its own food from inorganic matter?

Accepted Answer

Producer

Answer

Consumer

Answer

Predator

Answer

Prey

Question 36

Which of the following is a characteristic of a **balanced** ecosystem?

Accepted Answer

Relatively stable populations

Answer

Low levels of competition

Answer

Frequent introductions of new species

Answer

Rapid environmental changes

Question 37

The study of interactions between living organisms and their surroundings is called:

Accepted Answer

Ecology

Answer

Biodiversity

Answer

Population dynamics

Answer

Evolution

Question 38

In a food chain, the organism at the highest level is called a:

Accepted Answer

Tertiary consumer

Answer

Producer

Answer

Primary consumer

Answer

Secondary consumer

Question 39

Which of the following is a type of symbiotic relationship where both organisms benefit?

Accepted Answer

Mutualism

Answer

Commensalism

Answer

Parasitism

Answer

Competition

Question 40

The ultimate energy source for most ecosystems on Earth is:

Accepted Answer

Sunlight

Answer

Wind

Answer

Water

Answer

Soil

Question 41

Which of the following is NOT an abiotic factor in an ecosystem?

Accepted Answer

Animals

Answer

Sunlight

Answer

Temperature

Answer

Water

Question 42

Decomposers play a crucial role by:

Accepted Answer

Breaking down dead organisms into simpler substances

Answer

Producing food for other organisms

Answer

Providing shelter for animals

Answer

Regulating the population of predators

Question 43

A farmer uses ladybugs to control an aphid infestation on his crops. This is an example of:

Accepted Answer

Biological control

Answer

Organic farming

Answer

Integrated pest management

Answer

Chemical control

Question 44

Which of these is NOT a sign of a healthy ecosystem?

Accepted Answer

High levels of pollution

Answer

Efficient nutrient cycling

Answer

Stable populations

Answer

Lots of different species

Question 45

A food chain shows how energy flows from:

Accepted Answer

Producers to consumers

Answer

Consumers to producers

Answer

Producers to decomposers

Answer

Decomposers to consumers

Question 46

If a predator species suddenly decreases in an ecosystem, what would most likely happen to its prey?

Accepted Answer

The prey population would increase.

Answer

The prey population would decrease.

Answer

There would be no impact on the ecosystem.

Question 47

Which of these is an example of a relationship where both organisms benefit?

Accepted Answer

A bee pollinating a flower

Answer

A barnacle attached to a whale

Answer

A tapeworm living in a human intestine

Question 48

What is the main job of decomposers in an ecosystem?

Accepted Answer

Breaking down dead things and waste

Answer

Providing food for herbivores

Answer

Making oxygen through photosynthesis

Answer

Controlling the ecosystem's temperature

Question 49

A forest fire is an example of:

Accepted Answer

A natural disturbance

Answer

A food chain

Answer

Something humans cause

Answer

A relationship where both organisms benefit

Question 50

Plants use sunlight to make their own energy through a process called:

Accepted Answer

Photosynthesis

Answer

Transpiration

Answer

Decomposition

Answer

Respiration

Question 51

What makes a food web more complex than a food chain?

Accepted Answer

It shows many food chains linked together

Answer

It shows how humans affect the ecosystem

Answer

It shows the role of decomposers

Answer

It shows how energy flows from producers to consumers

Question 52

Which of these actions would help protect the variety of life in an ecosystem?

Accepted Answer

Creating safe spaces for endangered animals

Answer

Cutting down forests for farms

Answer

Bringing new species to an area

Answer

Using pesticides to kill insects