1-3 energy flow

Multiple Choice

Which of the following is an example of energy you might observe in nature?

• A bird flying in the sky

• A rock sitting on the ground

• A leaf changing color

• A cloud floating by

Multiple Choice

Which of the following best describes the flow of energy in an ecosystem?

• Energy enters from the sun and flows from one organism to another

• Energy is created by animals and flows to plants

• Energy is only transferred between plants

• Energy flows from decomposers to the sun

Open Ended

Explain the difference between organisms that make their own food and those that eat others. Why is this distinction important for understanding energy flow in ecosystems?

Multiple Select

Which of the following are examples of autotrophs?

• Plants

• Algae

• Cows

• Some bacteria

Multiple Choice

In the grizzly food chain, which organism is a secondary consumer?

• Grizzly bear

• Sockeye salmon

• Hinoki false cypress

• Earthworm

Fill in the Blanks

Primary consumers are also called

.

Multiple Choice

Which of the following statements about secondary consumers is correct?

• They eat primary consumers

• They are always herbivores

• They only eat plants

• They are decomposers

Multiple Choice

Which of the following best describes the role of tertiary consumers in a food chain?

• They produce their own food through photosynthesis.

• They break down dead organisms and recycle nutrients.

• They eat secondary consumers and are often apex predators.

• They eat only plants and are primary consumers.

Multiple Select

Which of the following statements about decomposers are correct?

• They break down dead organisms.

• They are always animals.

• They return nutrients to the soil.

• They are essential for recycling matter in ecosystems.

Multiple Choice

What is the main difference between detritivores and decomposers?

• Detritivores break down dead material physically, while decomposers break it down chemically.

• Detritivores are always insects, while decomposers are always fungi.

• Decomposers eat living plants, while detritivores eat dead animals.

• Detritivores recycle nutrients, decomposers do not.

Fill in the Blanks

In a food chain, energy always flows from the

to the consumers.

Open Ended

Explain how the organization of consumers in a food chain (primary, secondary, tertiary) helps maintain balance in an ecosystem.

Multiple Choice

What do the arrows in a food chain represent?

• The direction of energy flow from consumer to food source.

• The direction of energy flow from food source to consumer.

• The order in which animals are eaten.

• The number of organisms at each level.

Multiple Choice

Which level of the energy pyramid contains the most energy?

• Primary Producers

• Primary Consumers

• Secondary Consumers

• Apex Predators

Multiple Choice

According to the 10% energy transfer rule, if a primary producer has 1000 units of energy, how much energy would be available to a secondary consumer?

• 1 unit

• 10 units

• 100 units

• 1000 units

Open Ended

Explain why there are fewer top predators than producers in an ecosystem, using the concept of energy transfer.

Multiple Choice

Which of the following statements about food webs is correct?

• Food webs show only one food chain.

• Food webs are less realistic than food chains.

• Food webs show multiple interconnected food chains.

• Food webs do not include decomposers.

Fill in the Blanks

Fill in the blank: In a food web, arrows are used to show the direction of

flow.

Open Ended

Describe how the removal of one species can impact the entire food web and potentially lead to ecosystem collapse.

Open Ended

How does understanding the flow of energy in ecosystems help us make better decisions about protecting the environment?

Open Ended

How does the 10% rule explain why food chains are usually short?