Ecosystem LT1 SA

Eagles and grizzly bears live together in the same habitat. There will be competition between the eagles and the grizzly bears only if which of the following is true?

• Grizzly bears hibernate during the winter while eagles remain active.

• Pesticides in the fish population affect eagles’ eggs and decrease their population.

• Both grizzly bears and eagles feed on the same species of salmon.

• Laws prevent humans from being able to hunt eagles or grizzly bears.

Animals, including humans, need shelter, food, water, air, and space in order to survive. How do animals satisfy their basic needs?

• By interacting with their environment

• By interacting with plants

• By interacting with other animals

• All of these

Which of the following are basic needs for animals?

• Food, water, sunlight, space and shelter

• Shelter, food, water and protection

• Water, oxygen, space, shelter and relaxation

• Food, water, oxygen, space and shelter

Which of the following are basic needs for plants?

• food, water, carbon dioxide, space, shelter and the ability to maintain a constant body temperature

• oxygen, water, sunlight and shelter

• carbon dioxide, water, sunlight, and nutrients

• shelter, soil, water and sunlight

The soil of an ecosystem determines the kinds of organisms that are able to live there. Which of the following soil characteristics can have an effect on the ecosystem of an area?

• The composition of the soil

• The particle size of the soil

• The texture of the soil

• All of these

Perching birds, such as cardinals, warblers, and robins, live in trees. Suppose a developer cuts down all of the trees in an area to build a housing subdivision. What would most likely happen to the perching birds living in that ecosystem?

• The perching birds would begin building their nests on the ground.

• The perching birds would stop reproducing until new trees grew in the area.

• The perching birds would be forced to migrate to another area.

• The perching birds would all starve and subsequently die out.

How are changes in populations related to the availability of an ecosystem's resources?

• Changes in population are independent of the availability of an ecosystem's resources.

• Population sizes are limited by the amount of resources that are available.

• Large populations need the same amount of resources as small populations.

• As populations grow, ecosystems produce more resources in order to support the larger population.

A population of black bears depends on salmon from a stream for food. If a drought causes the stream to run dry one year, how will this likely impact the black bear population?

• The population will thrive on new species of fish.

• The population's size will decrease.

• The population's size will increase

• The population will be unaffected.

ALL energy flow for an ecosystem begins with ...

• plants
• the moon
• the sun
• algae

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

What are biotic factors?

• dead things
• living things/ organisms
• weather
• plants

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS2-3