Energy Flow

Which sequence best illustrates the flow of energy and matter through an ecosystem?

• sunlight → grass → panther → rabbit

• grass → sunlight → rabbit → panther

• sunlight → grass → rabbit → panther

• panther → rabbit → grass → sunlight

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which level contains the autotrophs in this food web?

• Level 1

• Level 2

• Level 3

• Level 4

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which two organisms are competing over a food source?

• Cricket and snake

• Mouse and panther

• Snake and mole

• Panther and rabbit

Tags

NGSS.MS-LS2-2

If the snake were removed from the ecosystem, which organism would immediately be impacted?

• The mouse population would increase because one of their predators was removed.

• The rabbit population would increase because one of their predators was removed.

• The mouse population would increase because they have less competition.

• The rabbit population would increase because they have less competition.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

In which energy pyramid are the organisms correctly displayed?

• Student 1 is correct because the amount of energy available to the top heterotroph is reduced.

• Student 2 is correct because the amount of energy at the autotroph level is reduced.

• Student 1 is correct because the amount of energy available to the top heterotroph is increased.

• Student 2 is correct because the amount of energy available to the autotroph and the heterotroph is the same.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the primary source of energy for the energy pyramid?

• Decomposers

• Heterotrophs

• Sunlight

• Autotrophs

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Prolonged periods of drought in an area cause decreases in plant population sizes. Which of the following statements describes how the decreases in plant population sizes affect other populations in the area?

• Omnivore population sizes increase, and herbivore population sizes increase.

• Omnivore population sizes decrease, and carnivore population sizes increase

• Herbivore population sizes increase, and carnivore population sizes decrease.

• Herbivore population sizes decrease, and carnivore population sizes decrease.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A researcher developed a food web to describe a specific ecosystem. What is the purpose of a food web?

• A food web shows the number of organisms in each population.

• A food web predicts how a group of organisms will change over time.

• A food web shows how matter and energy flow through an ecosystem.

• A food web is used to identify the populations in an ecosystem.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Researchers have discovered a chemical that sterilizes soil by killing all of the bacteria that are normally present. If this chemical were released in a forest ecosystem, what would be the most likely result on the ecosystem?

• The diversity of plants and animals in the ecosystem would increase.

• The number of plants would decrease because there would be less recycling of nutrients.

• The number of herbivores and omnivores in the ecosystem would increase due to lack of disease.

• There would be more energy available for insects and worms that live in the soil.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A frog that feeds on a grasshopper is in which level of this energy pyramid?

• Level A

• Level B

• Level C

• Level D

Tags

NGSS.MS-LS2-3