Food Webs and Changes to the Environment

In this food web, which three organisms would be immediately harmed if the mouse population declined?

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

What organism will possibly die out if the feather grass were removed from the desert?

• Jackrabbit

• Grasshopper

• Desert tortoise

• Desert fox

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which organisms in the food web shown above compete for the same food source in this environment?

• Grasshoppers and snakes

• Hawks and frogs

• Decomposers and grasses

• Hawks and snakes

What do the arrows in the food chain indicate about the flow of energy in an ecosystem?

• Energy is continuously recycled by the organisms in an ecosystem.

• Energy flows in one direction in an ecosystem, from producers to consumers.

• More of the available energy in an ecosystem is given to large animals than to small animals.

• Organisms at the end of the food chain receive more energy than those at the beginning.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

An organism that derives its energy from the Sun and is often a food source for other living organisms 

• Prey

• Parasite 

• Consumer

• Producer

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NGSS.MS-LS1-6

If the mouse population becomes sick and decreases, which statement about the food web will be true?

• The grass population will decrease.

• The hawk population will increase.

• The grass population will increase.

• The wildflower population will decrease.

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of these is a possible food chain for this environment?

• Sun → grass → fly → frog

• frog → fly → grass → Sun

• Sun ← grass ← fly ← frog

• Sun → fly → frog → snake

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

What is the effect of removing prey from a food chain?

• All predators above them will die or suffer.

• The prey's predator will die or suffer, but everybody else should be fine.

• The prey will always, eventually, come back

• The predators population will grow

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following best describes a food web?

• A network of interconnected food chains

• A linear sequence of organisms each feeding on the next

• A group of organisms that share the same habitat

• A collection of organisms that do not interact

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NGSS.MS-LS2-2

NGSS.MS-LS2-3

What is the primary source of energy for most food webs?

• The Moon

• The Sun

• The Earth's core

• Chemical reactions

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NGSS.MS-LS1-6

NGSS.MS-LS2-3