Ecosystems Interactions

Which of the following best describes an ecosystem?

• A place with many different species of animals

• The climate conditions of an environment

• All the biotic factors in an area

• A place where biotic and abiotic things interact with each other

Which of the following is not a biotic factor?

• bacteria

• soil

• mushroom

• tree

Which describes an interaction between a biotic and an abiotic factor?

• A population of deer is affected by the spread of a disease

• Polar bears struggle to survive as the Arctic ice melts

• Two birds compete against each other for a mate

• Rabbits eat the grass that grows in a field

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following can disrupt stable ecosystems?

• deforestation

• hurricane

• volcanic eruption

• tornado

• all of these

Tags

NGSS.MS-ESS3-2

NGSS.MS-LS2-4

Primary succession occurs where plants grow where there previously was none. Secondary succession occurs where the native vegetation is greatly reduced, but then new (and possibly different) vegetation eventually grows back. Which picture below shows secondary succession?

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Tags

NGSS.MS-LS2-4

Which organisms are the first to move into an ecosystem after a major disturbance?

• Large predators such as wolves and bear

• Simple producers such as grass and moss

• Small herbivores like insects and mice

• Large herbivores like moose and elk

Before herbivores can move into an ecosystem...

• There must be a stable population of predators

• There must be a stable population of producers

• There must be a stable population of decomposers

• There must be a stable population of heterotrophs

Tags

NGSS.MS-LS2-4

What is the "climax community?"

• A stable ecosystem with rich biodiversity

• The first stage of ecological succession

• The community directly after the environmental disturbance

• An ecosystem with many plants, but no animals

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which is true about the stages of ecological succession?

• All of the producers move in first, then, all of the consumers move back.

• Organisms can only join the ecosystem if the conditions are suitable for their needs

• It takes thousands of years to reach a climax community

• Ecological succession can happen in any random order and is highly unpredictable

Tags

NGSS.MS-LS2-3

What is true about ecosystems with very high biodiversity?

• They are unstable and threatened by environmental changes

• They more stable and are more likely to recover from environmental changes.

• They have so much competition that it harms most organisms

• The environmental conditions tend to be very harsh in these ecosystems

Tags

NGSS.MS-LS2-5