Ecosystems, Energy Flow, and Human Impact

The first trophic level in an ecosystem consists of __________, which make their own food through photosynthesis.

• producers

• consumers

• herbivores

• decomposers

Tags

NGSS.MS-LS1-6

The continuous movement of carbon between the atmosphere, biosphere, geosphere, and hydrosphere is called the __________.

• carbon cycle

• water cycle

• nitrogen cycle

• rock cycle

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In an energy pyramid, only about __________% of energy is passed from one trophic level to the next, while the rest is lost as heat.

• 10

• 5

• 15

• 20

Tags

NGSS.MS-LS2-3

A volcanic eruption is an example of a __________ change in an ecosystem, because it occurs naturally without human influence.

• natural

• artificial

• anthropogenic

• man-made

Tags

NGSS.MS-ESS2-2

Burning fossil fuels releases large amounts of __________ into the atmosphere, contributing to climate change.

• carbon dioxide

• oxygen

• nitrogen

• water vapor

Tags

NGSS.MS-ESS3-5

Which of the following organisms would be considered a primary consumer?

• Grass

• Hawk

• Deer

• Mushroom

Tags

NGSS.MS-LS2-3

What type of organism breaks down dead plants and animals, returning nutrients to the soil?

• Producers

• Decomposers

• Consumers

• Carnivores

Tags

NGSS.MS-LS2-3

Which of the following best describes the carbon cycle?

• Carbon moves in a continuous loop between living and nonliving things.

• Carbon stays in plants and animals until they die.

• Carbon only moves between plants and animals.

• Carbon does not return to the atmosphere once absorbed by plants.

Tags

NGSS.MS-LS2-3

Which process removes carbon dioxide from the atmosphere?

• Respiration

• Photosynthesis

Tags

NGSS.MS-LS1-6

A decrease in the number of predators in an ecosystem would likely cause:

• An increase in prey populations

• A decrease in producer populations

• More competition among herbivores

• All of the above

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4