Which statement best describes the role of decomposers?

They break down organic compounds into products used by other organisms.

They convert carbon dioxide and water to glucose.

They release oxygen to the atmosphere.

They provide energy for the synthesis of proteins.

In 2011 and 2012, scientists working on the Banana River in Florida recorded a dramatic increase in the number of manatee deaths. Over the past 50 years, this area has also seen the human population increase by more than 500,000 people. It is believed that pollution from numerous sewage tanks leaked into the water, eliminating the manatees’ food source, replacing it with an alga that is toxic to the manatee. This is an example of

human actions altering ecosystems with serious consequences

a natural cycle in an ecosystem

the effect of increased biodiversity on an ecosystem

direct harvesting in an ecosystem

Throughout New York State, some farmers have switched from growing a variety of vegetable crops to growing a single crop, such as corn. Other farmers are concerned that such a practice will make it more likely that an entire crop could be lost to disease or infestation by an insect pest. This is a valid concern because this practice

reduces the biodiversity of their fields

increases the number of decomposers in their fields

decreases the need to import food

increases the number of invasive species

A new automobile manufacturing plant is opening in a certain town. It will have some negative environmental impacts. This is a trade-off that the town officials had to consider carefully before giving final approval. They most likely gave their approval because the negative impacts would be offset by the

creation of new employment opportunities

release of pollutants into the environment

decrease of property values in the area around the plant

increase of automobile traffic in the area around the plant

The chart above compares the greenhouse gas emissions of several fuel sources. An accurate prediction that could be made regarding the information shown in the chart is that

the use of any one of the ethanol sources for fuel will each produce less greenhouse gases than the use of gasoline for fuel

a total change from gasoline to ethanol as a fuel would have no effect on greenhouse gas emissions

fossil fuels emit the least amount of greenhouse gases

the use of biomass-based fuels instead of fossil fuels will greatly increase the production of greenhouse gases

By studying the chemicals in rare plants that grow only in rain forests, scientists hope to discover new life-saving medicines. Chances of finding such new medicines are reduced by

loss of biodiversity due to human activities

recycling of materials in food webs

The graph represents a predator-prey relationship. What is the most probable reason for the increasing predator population from day 5 to day 7?

an increasing food supply from day 5 to day 6

a predator population equal in size to the prey population from day 5 to day 6

the decreasing prey population from day 1 to day 2

the extinction of the yeast on day 3

Base your answer to the question on the graph above and on your knowledge of biology. The graph shows the size of a population over time. Which term best identifies line B in the graph?

carrying capacity of the environment

niche of the species in the environment

biodiversity in the environment

number of populations in the environment

Base your answer to the question on the food chain and information below. The food chain involves organisms in Yellowstone National Park. Grasses → Elk → Wolves Wolves in the park were killed or driven off by humans in the 1920s and 1930s. In the winter of 1995, humans released 17 wolves from Canada into the park. A year later, 14 more wolves were released. One possible reason that the wolves were released into the park was to

reduce an overpopulation of elk

provide food for small predators

increase the number of herbivores

Two species of animals with a similar appearance live in the same habitat but do not compete for food. This is because they most likely

occupy different ecological niches

reproduce at different times of the year

In an ocean, the growth and survival of seaweed, small fish, and sharks depends on abiotic factors such as

sunlight, temperature, and minerals

sunlight, pH, and type of seaweed

number of decomposers, carbon dioxide, and nitrogen

number of herbivores, carbon, and food

Base your answer to the question on the graph above and on your knowledge of biology. In the pond where these fish live, temperature is both a

limiting factor and abiotic factor

source of energy and biotic factor

source of nutrition and abiotic factor

limiting factor and biotic factor

An invasive species, the spiny water flea, was recently found in a New York lake. These water fleas eat zooplankton, a food also consumed by native fishes. The fleas spread from lake to lake by attaching to fishing lines, anchor ropes, and boats. Which statement best describes the effect of the water flea on the lake?

It will feed on organisms that are important to other species.

It will not compete with animals in the local food chain.

The number of water fleas will decrease due to a lack of food.

There will be no effect on native species in the lake.

The graph below shows levels of a form of ultraviolet radiation (UV-B) and ozone thickness in Australia during December 1987 and January 1988. Which statement best describes the apparent relationship between ozone and UV-B?

When the ozone layer is thinner, more UV-B gets through it.

When ozone levels are at 2550 Dobson units, the UV-B levels are at 250 Dobson units.

The increase in UV-B reduces the destruction of the ozone layer.

If the ozone layer is thicker, UV-B levels on the ground increase.

Continued depletion of the ozone layer will most likely result in

an increase in skin cancer among humans

a decrease in atmospheric pollutants

an increase in marine ecosystem stability

Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to

reduce the rate of global warming

increase damage caused by acid rain

decrease the number of biotic factors in ecosystems

reduce destruction of the ozone layer

The Mississippi River Delta wetlands ecosystem is home to a large number of fish, birds, and other aquatic organisms. During the last century, this ecosystem has seen a decrease in wetland areas and species diversity due to land development, agriculture, and flooding. Conservation groups have been working to reconnect the Mississippi River with its flood plain and restore lost wetlands. One result of restoring wetland areas in this ecosystem would be

an increase in the carrying capacity of the ecosystem for wetland organisms

an increase in abiotic factors that would cause organisms to develop new adaptations

the development of an ecosystem that will prevent invasive species from settling there

to prevent the organisms that live in this ecosystem from competing for food and shelter

Ecology Unit Exam Review

9th Grade

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32 Qs

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Ecology Unit Exam Review

Quiz

•

Science

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9th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-LS2-4, MS-LS2-3, MS-LS2-2

Standards-aligned

Erin Degan

Used 36+ times

FREE Resource

32 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows living and nonliving factors and the interaction between them. The diagram best represents

a species

a population

a community

an ecosystem

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram represents a food web. What do the arrows in the diagram represent?

the flow of energy

ecological succession

an increase in population

the evolution of organisms

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram represents a food web. Which of the following is an herbivore in the food web?

frog

grass

deer

owl

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The diagram represents a food web. Which statement correctly describes interactions between organisms in this ecosystem?

Hawks and snakes prey on both rabbits and mice.

Mountain lions are predators of deer and mice.

Frogs compete with mice and owls for crickets.

Snakes compete with hawks for food and hawks are predators of snakes.

Tags

NGSS.MS-LS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Base your answer to the question on the diagram and on your knowledge of biology. The diagram represents part of a food web. Which population would be most immediately affected by the removal of the lizard population?

sedges

algae

ants

centipedes

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram represents an energy pyramid. Which type of organism could occupy levels B, C, and D of this energy pyramid?

consumer

producer

autotroph

carnivore

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In this food chain, the owl is the

producer

primary consumer

secondary consumer

tertiary consumer

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

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Ecology Unit Exam Review

32 questions

The diagram shows living and nonliving factors and the interaction between them. The diagram best represents

The diagram represents a food web. What do the arrows in the diagram represent?

The diagram represents a food web. Which of the following is an herbivore in the food web?

The diagram represents a food web. Which statement correctly describes interactions between organisms in this ecosystem?

Base your answer to the question on the diagram and on your knowledge of biology. The diagram represents part of a food web. Which population would be most immediately affected by the removal of the lizard population?

The diagram represents an energy pyramid. Which type of organism could occupy levels B, C, and D of this energy pyramid?

In this food chain, the owl is the

Which of the following is the term for organisms that must consume their food?

Which statement best describes the role of decomposers?

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