Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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A population of ducks lives in an area that floods many times each year. Some of the ducks are better at finding food on dry land, while other ducks are better at finding food in wet, muddy areas. Eventually, the land around the lake permanently changes from dry soil to wet, marshy mud.

The population will remain stable because the ducks will not be affected by this kind of change.

The population will eventually balance out so that there are equal numbers of both types of ducks.

The population will evolve so that most ducks survive no matter how they find food.

The population will evolve so that most ducks are better at finding food in wet, muddy areas.

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Which shows the levels of organization within an ecosystem from largest to smallest?

organism, population, community, ecosystem

organism, community, population, ecosystem

ecosystem, community, population, organism

ecosystem, population, community, organism

Earthworms are a species of worms that lives in moist soil along with other organisms like tiny insects and bacteria. Earthworms obtain water and nutrients by eating dead plant material found in the soil. Earthworms also release waste materials that help enrich the soil.

The earthworms are an environment.

The earthworms are a community.

Soil is the earthworm’s habitat.

Soil is the earthworm’s niche.

A widow’s peak is dominant over a straight hairline. The genotypes of the offspring are WW, Ww, ww, and ww.

2 widow’s peak, 2 straight hairline

3 widow’s peak, 1 straight hairline

1 widow’s peak, 3 straight hairline

4 widow’s peak, 0 straight hairline

Which scientist most inspired Darwin to pursue his studies of evolution?

Linnaeus, who first proposed that humans and primates are similar

Malthus, who thought that populations could outgrow their food sources

Linnaeus, who thought that populations could outgrow their food sources

Malthus, who first proposed that humans and primates are similar

How do changes in wind currents affect the short-term climate in a region?

Prevailing winds can cause a milder climate with heavy rain.

Global winds can cause a longer summer.

Prevailing winds can cause heavy rains or a dry climate.

Global winds can cause a longer winter.

Which example is most similar to the evidence that Darwin used to support his idea of natural selection?

When a deer population outgrows its food source, the population slowly dies off.

Birds that eat a variety of foods are not as well adapted to their environment as other birds.

Domestic dogs and wolves share characteristics, so they must have a common ancestor.

Mice that can blend in with their environment and escape predators are likely to survive and reproduce.

parasitismmutualismcommensalismcompetition

parasitism

mutualism

commensalism

competition

What is one way people have negatively affected land resources?

habitat restoration

urbanization

terrace farming

reforestation

Which option identifies ways that people positively affect Earth’s resources?

use cars that emit fewer harmful gases, build dams, and stop using all resources

stop using all resources, increase mining efforts, and halt the runoff of factory waste into rivers and streams

build dams, use cars that emit fewer harmful gases, and halt the runoff of factory waste into rivers and streams

increase mining efforts, build dams, and use cars that emit fewer harmful gases

The diagram shows an ocean food web.

krill

elephant seal

squid

penguin

The diagram shows a section of DNA.

adenine

thymine

cytosine

guanine

Carlos made a study chart about changes to the environment that are caused by humans. Environmental Changes Caused by HumansXYResults from introducing harmful substances into the environmentCauses an increase in ultraviolet radiation that reaches Earth Results from the rising human populationCauses the disappearance of many species in a short amount of time

X: Ozone Layer DestructionY: Mass Extinction

X: Long-Term ChangesY: Short-Term Changes

X: Short-Term ChangesY: Long-Term Changes

X: Mass ExtinctionY: Ozone Layer Destruction

Purple flowers are dominant over white flowers. The parent generation includes two heterozygous parents.

3 purple and 1 white

3 white and 1 purple

1 purple, 2 lilac, and 1 white

1 white, 2 speckled, 1 purple

Ladybug beetles chase, capture, and eat smaller insects called aphids.Which best describes this relationship?

It is parasitism. The ladybugs are the parasites and the aphids are the hosts.

It is parasitism. The ladybugs are the hosts and the aphids are the parasites.

It is predation. The ladybugs are the predators and the aphids are the prey.

It is predation. The ladybugs are the prey and the aphids are the predators.

Which occurs during both DNA replication and protein production?

RNA leaves the nucleus.

DNA leaves the nucleus.

RNA unzips.

DNA unzips.

Which is an example of an environmental influence that would most likely result in natural selection?

The soil in a field always has lots of nutrients, so corn plants in a population can grow quickly.

A fish is born with a genetic mutation that produces a longer tail, allowing the fish to swim faster than others in the population.

A food resource disappears in a pond, and some frogs in a population can eat the remaining food resource, while others cannot.

The temperature in a lake remains constant, so most of the turtle population survives to adulthood.

Rosa records the distance that a toy car rolls and the time it takes to cover the distance.What scientific practice is this?

collecting data

asking a question

providing explanations

communicating results

After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific investigation?

Which bird’s eggs taste the best?

What substances make up an eggshell?

Which birds have the most beautiful feathers?

Which type of bird makes the best pet in an apartment?

Why are scientists most likely working on developing cleaner-burning fuel for cars?

to increase fuel consumption

to increase fuel production

to reduce noise pollution

to reduce air pollution

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