Ecology Feedback Loops

Negative Feedback Loops:

• amplify processes

• prevent small changes from getting larger

• are initiated during childbirth

• are found only in plants

Tags

NGSS.HS-LS1-3

As the Earth warms, increased evaporation produces more clouds. Clouds increase albedo, reflecting more light away from the Earth. The temperature falls. Rates of evaporation fall.

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-ESS2-2

In a positive feedback loop, each action creates a consequence that _____________________ the other action.

• decreases

• has no effect on

• amplifies

Tags

NGSS.HS-LS1-3

In a negative feedback loop, each action creates a consequence that _____________________ the other action.

• decreases

• has no effect on

• amplifies

Tags

NGSS.HS-LS1-3

Does the graph show positive or negative feedback?

• Positive, because when the red line shifts, the blue one does also

• Negative, because the blue line starts below equilibrium

• Negative, because the two actions are keeping each other near equilibrium

• Both positive and negative because the graph moves up and down

Tags

NGSS.HS-LS1-3

When the population of deer in an area begin to grow, they start overgrazing the vegetation that feeds them. When there is not enough vegetation to sustain the rapidly growing deer population, they will begin to die off until the vegetation grows back to normal levels and the deer will have enough food to repopulate again. 

• Positive

• Negative

Tags

NGSS.HS-LS2-1

NGSS.HS-LS2-2

NGSS.HS-LS2-6

Negative feedback loops result in stabilization of a system.

Negative feedback is a process that _______ the effects of a change.

• reduces

• amplifies

• has no effect

Tags

NGSS.HS-LS1-3

Positive feedback loops result in a system moving towards an extreme. Positive feedback is a process that _______ the effects of a change.

• reduces

• amplifies

• has no effect

Loops that cause a response to build up and build up until something big happens are called ____________ loops

• positive

• negative

Tags

NGSS.HS-LS1-3

Which of the following best describes a negative feedback loop in an ecosystem?

• A) It amplifies changes in the ecosystem.

• B) It stabilizes the ecosystem by reducing changes.

• C) It has no effect on the ecosystem.

• D) It only occurs in aquatic ecosystems.

Tags

NGSS.HS-LS1-3