Populations and the Environment Answers

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1
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Plants absorb nutrients from soil, and nutrients help plants grow. Which level of organization best describes this interaction between plants and soil?

A
community
B
ecosystem
C
organism
D
population
2
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Which statement describes a population in which there is a competition for energy?

A
Several lions fight over a recent animal kill.
B
Male peacocks fight one another for a female.
C
Elephants are in search of water during a dry season.
D
Squirrels are searching for a new place to make a nest.
3

Which descriptions can be used for sand on a beach?

A
abiotic factor, once living
B
biotic factor, living thing
C
biotic factor, nonliving thing
D
abiotic factor, nonliving thing
4

Tall trees create shade over smaller trees, causing the smaller trees to experience changes in sunlight.Which is most likely a limited resource for the smaller trees?

A
energy
B
reproduction
C
shelter
D
water
5

Which phrase defines a community?

A
environment where nonliving things exist
B
group of the same species that live together
C
group of several populations living in an area
D
environment where living and nonliving things interact
6

A river contains several beaver dams that are constructed from tree limbs and mud. If other beavers move to this area to build a dam, what is one need for which they are most likely competing?

A
ability to find a mate
B
area with enough sunlight
C
space adequate for building a shelter
D
water flowing through the river
7

A drought is a long period of dryness. If animals fight during a drought, which basic need is most likely limited?

A
water supply
B
shelter or space
C
the ability to reproduce
D
the availability of sunlight
8

Which description shows competition in an environment?

A
an organism that feeds on some food
B
an organism that finds a place to sleep
C
three organisms of the same species living in an area
D
three organisms battling over limited resources
9

Where does competition for reproduction most likely occur?

A
ecosystem
B
community
C
organism
D
population
10

Which is considered the foundation level of organization in an environment?

A
community
B
ecosystem
C
organism
D
population
11

Which statement describes a biotic factor interacting with the environment?

A
Water flows down a creek bed.
B
Soil contains nutrients for growth.
C
Deer graze through the grassland.
D
The sun emits solar rays that reach Earth.
12

Which basic need would two male organisms most likely compete over?

A
energy
B
food
C
reproduction
D
water

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