What may happen if the snowshoe hare was removed from the food web pictured?

The shrew population would decrease due to being only hawk food source.

The insects in the habitat would increase.

The willow tree population would decrease.

Foxes would dies due to no food source.

What would most likely happen if an ecosystem no longer received sunlight?

All living organisms would eventually die

The number of herbivores would increase

The number of plants would increase

Examples of how humans negatively affect local ecosystems are

Building dams, deforestation (cutting down trees), adding point sources to nearby streams to allow for run-off, building roads and structures, and salting roads.

Creating laws to prohibit fishing from local streams.

Planting trees and other plants to attract native species.

Removing non-native species from the environment.

Which answer is true regarding biodiversity?

An ecosystem is healthier when the biodiversity is great.

As long as there are enough producers, an ecosystem is considered to have a good amount of biodiversity.

The rain forest has an unhealthy ecosystem because its biodiversity is too great.

Biodiversity is positively affected when non-native species are introduced into an environment

Which ecosystem below describes a stable ecosystem?

This ecosystem suffered a tornado, but due to great biodiversity, it was able to be restored.

An invasive species decreased the amount of biodiversity by half

This ecosystem’s deer have increased due the loss of a predator population, now the producer population has decreased by ¼.

This ecosystem is impacted by overfishing, causing 3 fish species to become extinct.

How might deforestation impact this ecosystem?

Insects and birds will decrease

Insects and birds will increase

Describe what would happen to the zebra population and the plant population if the cheetah and hyena both left the ecosystem.

The zebra population would greatly increase, causing the plant population to decrease.

The zebra population would decrease with the absence of predators; the plant population would stay the same.

The zebra population would decrease, causing the plant population to increase.

The zebra population would greatly increase, causing the plant population to also increase.

The San Marcos salamander, Eurycea nana, is a light reddish-brown translucent salamander about 2-5 cm in length. E. nana is found only in Spring Lake and a portion of the San Marcos River. Which human activity would most likely decrease the ability of the salamanders to survive?

Increasing water consumption that decreases the flow of clean water from the springs that feed the river.

Public transportation that reduces the number of automobiles that contribute to pollution runoff into the river.

Tourism that helps fund the education programs related to tiver ecosystem conservation.

The addition of a new food source into the river that limits competition for resources.

In the mid-1980s an aggressive strain of algae known as Caulerpa was accidentally introduced into the Mediterranean Sea when a seaside aquarium cleaned out its tanks. The algae contains a toxin that prevents native herbivores from consuming it. Caulerpa quickly spread over the sea floor, crowding out many species including sponges, corals, sea fans, and lobsters. Which statement explains the most likely impact Caulerpa has had on the biodiversity of the Mediterranean Sea?

Caulerpa became dominant within the ecosystem and reduced the biodiversity.

The presence of Caulerpa within an ecosystem is an indicator of the ecosystem's health.

The spread of Caulerpa improved the habitat for many species of sea grasses, and increased the biodiversity.

Caulerpa interbred with native species with the smae adaptations within the ecosystem.

A group of people in your town decide they will each use a portion of their yard to plant a variety of native plants. Fifty families replace a part of their yard with native plants. Which of these is most likely to happen?

The biodiversity of the town will increase.

The population of the town will decrease.

Beavers are a keystone species in North America. The dams beavers build create ponds where many other organisms live. What will most likely happen to an ecosystem if humans remove the beavers?

The biodiversity of the ecosystem will increase.

The ecosystem will become stable.

Mutations are important because they bring about

genetic variations needed for a population to evolve.

death of the organisms in which they develop.

benefits fro the individual not for the population.

changes in a genotype but not phenotype.

a group of the same species in the same geographic area.

a group of similar species in different areas

a group of several species in the same geographic area

a group of several species along with their abiotic factors in a small area.

A small town in the piney woods of East Texas has a soccer field composed of native grasses. The soccer field is mowed once a week. What effect does continual mowing have on the ecology of the field?

Mowing maintains a low species diversity by inhibiting further succession.

Mowing increases the likelihood of nonnative species displacing native species.

Mowing increases the number of species found in the field.

Mowing causes different types of communities to form across the field.

USA 2 Alterations in Ecosystems Review

Authored by Samah Al-hamadi

Science

11th Grade

NGSS covered

Used 5+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of succession is shown going from figure A to figure B?

primary succession

eutrophication

secondary succession

intermediate

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

After a forest fire, an ecosystem would start regrowth through -

primary succession

secondary succession

climax community

limiting factors

Tags

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Starts with BARE ROCK followed by lichen

primary succession

secondary succession

both types of succession

Tags

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If there is 1000 Kcal available in the producers in trophic level 1, how much energy is available in the herbivores in trophic level 2?

10Kcal

1Kcal

100Kcal

1000Kcal

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What would happen to the bird if the green fish died out?

The bird population would grow

The smaller fish will die out

The bird population will die out

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-2

NGSS.MS-LS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Biodiversity leads to

Increased Stability

Decreased Stability

Increased Exctintions

Increased Endangered Species

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

There would be a decrease in the small bird population.

There would be a decrease in the grass/flowers population.

There would be a decrease in the mice population.

There would be an increase in the grass/flowers population.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-2

NGSS.MS-LS2-1

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USA 2 Alterations in Ecosystems Review

What type of succession is shown going from figure A to figure B?

After a forest fire, an ecosystem would start regrowth through -

Starts with BARE ROCK followed by lichen

If there is 1000 Kcal available in the producers in trophic level 1, how much energy is available in the herbivores in trophic level 2?

What would happen to the bird if the green fish died out?

Biodiversity leads to

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

What may happen if the snowshoe hare was removed from the food web pictured?

A pilot fish usually follows behind sharks to pick up food scraps that they leave behind. The fish gets food and the shark is unaffected. This is an example of:

A clownfish uses a sea anenome as a safe place to live. While living there, the clownfish lures in food for the anenome. This is an example of what type of relationship?

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