Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Human Impact on the Environment Answers

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What is the source of energy in most ecosystems?

animals

plants

oxygen

sunlight

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Which is the best example of commensalism?

Honey bees feed on the pollen of cornflowers and help the flowers reproduce.

Barnacles ride on a gray whale’s back to obtain food, and the whale is not harmed.

Squirrels and chipmunks eat the same nuts in a forest where food is scarce.

Prairie dogs often collect and eat food in groups so they are better protected from enemies.

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?

Individuals of population X are predators.

Individuals of population X are prey.

Individuals of population Y caught and spread a disease.

Individuals of population Y lost their shelters after a flood.

Examine the stone building shown.

abiotic because it is made from rock

biotic because it is made from rock

abiotic because it is a resource that living things use

biotic because it is a resource that living things use

Kendra is studying the energy pyramid shown.

The ecosystem can support fewer foxes than grasshoppers.

Foxes require less energy than birds.

The ecosystem can support more foxes than birds.

Grasshoppers require more energy than birds.

Study the picture of the ocean.

The environment contains several of the same species of coral.

The shallow area of the ocean meets the needs of the coral and the fish.

The ocean has fish and coral that live in the same area.

The coral take in food from the water and provide shelter for the fish.

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?

This is an example of cooperation, and the musk ox were better adapted to the environment.

This is an example of predation, and the musk ox were better adapted to the environment.

This is an example of competition, and the musk ox were better adapted to the environment.

This is an example of competition, and the caribou were better adapted to the environment.

Which best describes the carrying capacity of an environment?

An area of a desert can support a population of 320 cactus plants.

Over 1,500 species of birds live in a tropical rain forest.

About 500 fish in part of a river died as a result of water pollution.

A vegetable garden is six feet long and 10 feet wide.

An ocean food chain is shown.

clownfish

brittle star

killer whale

octopus

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?

The population will decrease because grasshoppers are the competition.

The population will increase because grasshoppers are the prey.

The population will increase because grasshoppers are the competition.

The population will decrease because grasshoppers are the prey.

parasitismmutualismcommensalismcooperation

parasitism

mutualism

commensalism

cooperation

Which organism is a producer?

oak tree

mushroom

mountain lion

butterfly

The picture shows a natural environment.

water, sky, rocks, sand

bush, snake, cactus, rat

rat, sand, cactus, snake

bush, water, sky, snake

Study the image.

an organism

a community

a niche

a population

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)

Which represents the size of a population?

the birth rate

number of species in an area

the death rate

number of indivduals in a species

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

organism

population

abiotic

habitat

Carrying capacityPopulation growthLimiting factorImmigration rate

Carrying capacity

Population growth

Limiting factor

Immigration rate

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

trees

grasses

bacteria

minerals

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

Cooperation is a positive interaction between the two organisms, and predation and competition result in a negative interaction for at least one organism.

Cooperation and competition are positive interactions between the two organisms, and predation results in a negative interaction for at least one organism.

Cooperation and predation are negative interactions between the two organisms, and competition results in a positive interaction for at least one organism.

Cooperation results in a negative interaction for at least one organism, and competition and predation are positive interactions between the two organisms.

Which describes a similarity between abiotic and biotic factors?

They may include things that were once living.

They are both necessary for organisms to survive.

They are not usually important parts of the environment.

They can be easily replaced if they are used or destroyed.

hostcompetitorpredatorprey

host

competitor

predator

prey

Skunks eat fruits, worms, plants, fish, insects, and more.Which describes the role of a skunk?

autotrophic omnivore

heterotrophic omnivore

autotrophic carnivore

heterotrophic carnivore

In which type of relationship do both species always benefit?

mutualism

symbiosis

commensalism

competition

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Human Impact on the Environment Answers

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