Balance Within Ecosystems Quiz

A group of antelope leaving the herd in search of better grassland is an example of ​ (a)   .

• emigration
• immigration
• increasing birth rate
• decreasing death rate

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NGSS.MS-LS2-1

If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is

(a)  

• 4 beetles per square meter.
• 100 beetles per square meter.
• 20 beetles per square meter.
• 5 beetles per square meter.

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NGSS.MS-LS2-1

All of the following are examples of limiting factors to species dispersal except _______.

(select the picture that does NOT represent a limiting factor)

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

The nonliving resources that humans obtain from ecosystems are called ​ ​ (a)   .

• abiotic resources
• biotic resources
• organisms
• populations

If all members of a species disappear from Earth, the species is said to be

• extinct

• endangered

• threatened

• keystone

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NGSS.MS-LS4-1

Which of the following is an example of how human activities may harm the balance in an ecosystem?

• primary succession

• wildlife preserves

• desertification

• planting native plants

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NGSS.MS-LS2-4

NGSS.MS-ESS3-4

The number of different species in an area is referred to as its

• niche diversity

• climate

• habitat fragmentation

• biodiversity

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NGSS.MS-LS2-5

Which of the following is an example of a negative effect of agricultural technology on the environment?

• increased oxygen in the atmosphere

• use of fertilizers to increase crop yield

• clearing large tracts of forest for new farmland

• banning the use of DDT in 1972.

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

A species that influences the survival of many other species in an ecosystem is called a(n) _________________________.

• endangered species

• keystone species

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NGSS.MS-LS2-4

In the process of _______________, the organisms that are best suited to their environments are most likely to survive and reproduce.

• natural selection

• elimination

• guessing

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NGSS.MS-LS4-4