Interactions in the Environment

Multiple Choice

What is an ecosystem?

• A single animal living in an environment

• A community of living and nonliving things that interact together

• A large forest filled with trees and birds only

• collection of animals that do not depend on each other

Multiple Choice

Which of the following is a nonliving part of an ecosystem?

• Tree

• Squirrel

• Soil

• Butterfly

Multiple Choice

What role do plants play in the food chain?

• They are consumers that eat other animals

• They are decomposers that break down waste

• They are producers that make their own food

• They are predators that hunt herbivores

Multiple Choice

The relationship between bees and flowers is an example of —

• Mutualism

• Commensalism

• Parasitism

• Competition

Multiple Choice

What can happen when an ecosystem’s balance is disrupted?

• It becomes healthier

• Nothing changes

• New species immediately take over

• It can be thrown off and become less stable

Multiple Choice

What does the word biotic refer to?

• The nonliving things in an ecosystem

• The weather and temperature in an area

• The living things in an ecosystem

• Only the animals in an ecosystem

Multiple Choice

Which of the following is an abiotic component?

• Soil

• Bird

• Tree

• Mushroom

Multiple Choice

Why are abiotic components important in an ecosystem?

• They provide food for animals

• They help recycle nutrients

• Life couldn’t exist without them

• They eat other organisms

Multiple Choice

Which example shows an interaction between biotic and abiotic components?

• Two wolves hunting together

• Fish swimming in water and needing oxygen to survive

• A squirrel eating an acorn

• Bees pollinating flowers

Multiple Choice

What can happen if an abiotic factor, such as water, changes drastically?

• Nothing will change in the ecosystem

• The biotic components become abiotic

• New species automatically appear

• The ecosystem can be affected and lose its balance

Multiple Choice

What is the main job of producers in an ecosystem?

• To break down dead organisms

• To control animal populations

• To eat other animals for energy

• To make their own food using sunlight

Multiple Choice

Which of the following correctly matches each group with its example?

• Decomposer – fungus

• Producer – rabbit

• Consumer – tree

• Producer – fox

Multiple Choice

Why are consumers important in an ecosystem?

• They make energy from sunlight

• They create food for other organisms

• They help recycle nutrients into the soil

• They keep populations from becoming too large

Multiple Choice

What would most likely happen if decomposers disappeared from an ecosystem?

• There would be too many predators

• Dead matter would pile up and nutrients wouldn’t return to the soil

• Plants would stop needing sunlight

• Consumers would start making their own food

Multiple Choice

What best describes the relationship between producers, consumers, and decomposers?

• They work separately with no connections

• Consumers control producers, but decomposers aren’t involved

• They form a cycle that recycles energy and nutrients through the ecosystem

• Producers depend on decomposers for sunlight