AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Human Impact on the Environment Answers

0 verified answers1 views
1
Free Preview

What is the source of energy in most ecosystems?

A
animals
B
plants
C
oxygen
D
sunlight
2
Free Preview

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

Population X and Y live in the same area. The size of population X increases over time. As a direct result, the size of population Y decreases.Which is most likely the limiting factor of population Y?

A
Individuals of population X are predators.
B
Individuals of population X are prey.
C
Individuals of population Y caught and spread a disease.
D
Individuals of population Y lost their shelters after a flood.
4

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
5

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.
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

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.
8

Which best describes the carrying capacity of an environment?

A
An area of a desert can support a population of 320 cactus plants.
B
Over 1,500 species of birds live in a tropical rain forest.
C
About 500 fish in part of a river died as a result of water pollution.
D
A vegetable garden is six feet long and 10 feet wide.
9

An ocean food chain is shown.

Question illustration
A
clownfish
B
brittle star
C
killer whale
D
octopus
10

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.
11

parasitismmutualismcommensalismcooperation

A
parasitism
B
mutualism
C
commensalism
D
cooperation
12

Which organism is a producer?

A
oak tree
B
mushroom
C
mountain lion
D
butterfly
13

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
14

Study the image.

Question illustration
A
an organism
B
a community
C
a niche
D
a population
15

During one year, seven coyotes in a population die. Eight immigrate into the population, but none emigrate.If the overall population growth is 13 coyotes, what was the birth rate of coyotes during the year?Use this formula:population growth = (birth rate + immigration) – (death rate + emigration)

A
7
B
11
C
12
D
15
16

Which represents the size of a population?

A
the birth rate
B
number of species in an area
C
the death rate
D
number of indivduals in a species
18

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

A
organism
B
population
C
abiotic
D
habitat
19

Carrying capacityPopulation growthLimiting factorImmigration rate

A
Carrying capacity
B
Population growth
C
Limiting factor
D
Immigration rate
20

Which could be classified as part of an ecosystem but not part of a community?

A
trees
B
grasses
C
bacteria
D
minerals
21

Which statement best compares competition, cooperation, and predation between two organisms?

A
Cooperation is a positive interaction between the two organisms, and predation and competition result in a negative interaction for at least one organism.
B
Cooperation and competition are positive interactions between the two organisms, and predation results in a negative interaction for at least one organism.
C
Cooperation and predation are negative interactions between the two organisms, and competition results in a positive interaction for at least one organism.
D
Cooperation results in a negative interaction for at least one organism, and competition and predation are positive interactions between the two organisms.

Did you find these answers helpful?

More from this Course

Quiz
8 verified answers

Unit Test

Quiz
2 verified answers

The Theory of Evolution

Quiz
1 verified answers

Living Things and the Environment