Dynamic Ecosystems

What is the ultimate source of energy in any food chain?

• the sun

• producers

• consumers

• decomposers

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Weather (such as rain) and soil conditions are considered to be part of the ____________ factors of an ecosystem.

• biotic

• antibiotic

• abiotic

• biomass

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NGSS.MS-LS1-5

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All the nonliving things in an environment are called the ________ factors.

• abiotic

• biotic

• ecological

• inorganic

Tags

NGSS.MS-LS2-3

What is an example of a biotic factor?

• water

• grass

• soil

Tags

NGSS.MS-LS2-4

If a disease strikes the snake population in the food chain shown, what will be the initial effect on the populations of hawks and rabbits?

• The populations of hawks and rabbits will decrease.

• The populations of hawks and rabbits will increase.

• The population of hawks will increase. The population of rabbits will decrease.

• The population of hawks will decrease. The population of rabbits will increase.

Tags

NGSS.MS-LS2-1

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NGSS.MS-LS2-4

In the stable food chain shown here, what would you expect to happen initially if you were to suddenly double the population of rabbits?

• The populations of the other three species would also increase.

• The populations of the other three species would decrease.

• The grass population would decrease. The snake population and hawk population would increase.

• The grass population and hawk population would decrease. The snake population would increase.

Tags

NGSS.MS-LS2-1

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NGSS.MS-LS2-3

NGSS.MS-LS2-4

What event within the food chain might lead to the graph shown below?

• A disease in the population of rabbits.

• A disease in the population of snakes.

• A disease in the population of hawks.

• It is impossible to tell which of the above occurred.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

What happened to the tree population in this forest?

• The number of trees stayed the same for two years and then began to decrease.

• The number of trees stayed the same for two years and then began to increase.

• The number of trees decreased for two years and then stayed the same.

• The number of trees increased for two years and then stayed the same.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What happens when the number of producers shrinks?

• The number of consumers increase.

• The number of decomposers increase.

• The number of consumers decrease.

• The number of producers increase.

Tags

NGSS.MS-LS2-1

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NGSS.MS-LS2-4

A(n) __________ includes all living and non-living things in an environment.

• population

• niche

• abitotic

• ecosystem

Tags

NGSS.MS-LS2-3