AnswersFL-2002070-MJ Comprehensive Science 2Energy Flow in Ecosystems

Energy Flow in Ecosystems — Unit test Answers

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In a grassland ecosystem, praying mantises catch and eat grasshoppers. However, there has been a significant decrease in the praying mantis population in recent years.How will this most likely affect the grasshopper population over time?

A
The population will decrease because grasshoppers are the competition.
B
The population will increase because grasshoppers are the prey.
C
The population will increase because grasshoppers are the competition.
D
The population will decrease because grasshoppers are the prey.
2
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Which is the best example of commensalism?

A
Honey bees feed on the pollen of cornflowers and help the flowers reproduce.
B
Barnacles ride on a gray whale’s back to obtain food, and the whale is not harmed.
C
Squirrels and chipmunks eat the same nuts in a forest where food is scarce.
D
Prairie dogs often collect and eat food in groups so they are better protected from enemies.
3

Kendra is studying the energy pyramid shown.

Question illustration
A
The ecosystem can support fewer foxes than grasshoppers.
B
Foxes require less energy than birds.
C
The ecosystem can support more foxes than birds.
D
Grasshoppers require more energy than birds.
4

Which organism is a producer?

A
oak tree
B
mushroom
C
mountain lion
D
butterfly
5

Study the image.

Question illustration
A
an organism
B
a community
C
a niche
D
a population
6

Study the picture of the ocean.

Question illustration
A
The environment contains several of the same species of coral.
B
The shallow area of the ocean meets the needs of the coral and the fish.
C
The ocean has fish and coral that live in the same area.
D
The coral take in food from the water and provide shelter for the fish.
7

What is the source of energy in most ecosystems?

A
animals
B
plants
C
oxygen
D
sunlight
8

In the Arctic, caribou and musk ox eat different kinds of plants, but the plants they eat typically grow in the same area. Therefore, these two species often require the same space in which to feed. In one part of the Arctic, caribou numbers have decreased and musk ox numbers have increased.Which best summarizes this scenario?

A
This is an example of cooperation, and the musk ox were better adapted to the environment.
B
This is an example of predation, and the musk ox were better adapted to the environment.
C
This is an example of competition, and the musk ox were better adapted to the environment.
D
This is an example of competition, and the caribou were better adapted to the environment.
9

parasitismmutualismcommensalismcooperation

A
parasitism
B
mutualism
C
commensalism
D
cooperation
10

An ocean food chain is shown.

Question illustration
A
clownfish
B
brittle star
C
killer whale
D
octopus
11

Examine the stone building shown.

Question illustration
A
abiotic because it is made from rock
B
biotic because it is made from rock
C
abiotic because it is a resource that living things use
D
biotic because it is a resource that living things use
12

The picture shows a natural environment.

Question illustration
A
water, sky, rocks, sand
B
bush, snake, cactus, rat
C
rat, sand, cactus, snake
D
bush, water, sky, snake
13

Kayla is learning about ecology and made a study chart.Which headings best complete the chart?

Question illustration
A
X: AbioticY: Biotic
B
X: BioticY: Abiotic
C
X: NicheY: Habitat
D
X: HabitatY: Niche
14

An energy pyramid shows the amount of available at each feeding level in an ecosystem.

Answer not available
15

Which statement describes the habitat of polar bears?

A
Polar bears eat meat, so they are carnivores.
B
Polar bears are predators because they hunt other animals.
C
Polar bears live in the Arctic, where it is cold and icy.
D
Polar bears are active all year and do not hibernate.
16

Rosa has a vegetable garden. She places earthworms, which are decomposers, in the garden soil.What is Rosa most likely trying to do?

A
prevent insects from eating the plants
B
create usable food energy for the plants
C
enrich the soil with nutrients
D
kill the bacteria in the soil
17

hostcompetitorpreyparasite

A
host
B
competitor
C
prey
D
parasite
18

A group of organisms of the same species that live in an area is called a(n) .

Answer not available
19

How is an individual palm tree growing in a tropical forest classified?

A
organism
B
population
C
abiotic
D
habitat
20

The picture shows an interaction within an environment.

Question illustration
A
Two abiotic factors are interacting.
B
Two biotic factors are interacting.
C
The tree is abiotic and is interacting with a biotic factor.
D
The tree is biotic and is interacting with an abiotic factor.

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