4.2 Quiz: Energy Flow in Ecosystems

In the open ocean, tiny organisms called _______ perform photosynthesis.

• animal plankton

• bacteria

• decomposers

• phytoplankton

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NGSS.MS-LS1-6

They are primary producers in many _______ that overlap to form a(n) _______.

• food webs; ecological pyramid

• food chains; food web

• ecological pyramids; trophic levels

• food webs; food chains

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NGSS.MS-LS2-3

The diagram represents five trophic levels in an ecosystem. Which of the following BEST describes how energy flows in an ecosystem?

• Energy flows through all trophic levels and then back to the producers.

• Most of the energy from plants is transferred to the mice, grasshoppers, and rabbits because plants don't have to search for their food.

• Birds have the most energy becase energy from all other trophic levels flows to birds.

• About 10% of the energy at one trophic level is passed to the next trophic level.

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NGSS.MS-LS2-3

NGSS.MS-LS1-6

The diagram is a model of an energy pyramid in an ecosystem. The levels of the diagram are labeled with percentages. What do the percentages represent?

• average energy requirements of organisms in each trophic level

• relative amounts of energy contained by organisms in each trophic level

• energy lost as heat from one trophic level to the next

• rate of conversion of light energy to chemical energy

Tags

NGSS.MS-LS2-3

Ethan is modeling food chains he observes in his local ecosystem. Which of these models represent possible food chains he might observe? (2 correct)

• primary producer-->consumer-->consumer

• primary producer-->consumer-->primary producer-->consumer

• primary producer-->consumer-->consumer-->consumer-->consumer

• consumer-->primary producer-->consumer-->primary producer

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

This pyramid of numbers is modeling organisms within an ecosystem. Which of the feeding interactions is MOST LIKELY to be part of this ecosystem?

• grasses in a meadow that provide food for many small animals

• a dead whale that provides food for many ocean animals

• an algae colony that provides food for many fish

• a tree that provides food for thousands of insects

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-1

What should an ecologist measure in order to construct a pyramid of biomass for an ecosystem?

• the biomass in each trophic level of the food web

• the total mass of all the organisms in a representative area of the ecosystem

• the total mass of all the organisms in the ecosystem

• the number of organisms in each trophic level of the food web

A food web shows feeding relationships in an ecosystem. In this food web, what is represented by the chains of arrows from the grass to the fox?

• • the one-way flow of energy through the ecosystem

• • the one-way flow of matter through the ecosystem

• • the conservation of energy in the ecosystem

• the removal of energy from the ecosystem

Tags

NGSS.MS-LS2-3

Ecologists use models to illustrate the cycling of matter and flow of energy within an ecosystem. Which of the claims below does this model support? Select all three claims that are supported.

• • The number of trophic levels is unlimited.

• • The number of trophic levels is limited, and typically is less than 10.

• • On average, about 10 percent of available energy is transferred from one trophic level to the next.

• • Among consumers in an ecosystem, first-level consumers have the most available energy.

Tags

NGSS.MS-LS2-3

What color is the sky on a clear day?

• blue

• pink

• red

• gray