Unit 1 – The Living World: Ecosystems 1.11 Food Chains and Food

Which of the following is an example of a positive feedback loop in a food web?

• Increase in a predator population leading to a decrease in prey population

• Introduction of an invasive species causing a decline in native species

• Decrease in primary producer population casuing a decline in herbivores

• Decrease in sea otter population resulting in an increase in kelp

Tags

NGSS.MS-LS2-4

What occurs in a negative feedback loop when there is more precipitation in a lake?

• The lake decreases in surface area

• The lake remains the same size

• The lake evaporates completely

• The lake increases in surface area

Tags

NGSS.MS-ESS2-4

What occurs in a positive feedback loop in a food web?

• Change in one part of the ecosystem has no effect on the original change

• Change in one part of the ecosystem stabilizes the original change

• Change in one part of the ecosystem amplifies the original change

• Change in one part of the ecosystem decreases the original change

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What can cause trophic cascades in ecosystems?

• Only human-induced changes

• Only natural changes

• Both natural and human-induced changes

• Only changes in primary producers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What are feedback loops in natural systems a response to?

• Changes in input and outputs

• Changes in the Earth's core

• Changes in solar radiation

• Changes in the atmosphere

Tags

NGSS.MS-ESS2-6

Which term describes a series of changes in an ecosystem that have a self-reinforcing effect?

• negative feedback loop

• tropic cascade

• food chain

• positive feedback loop

What happens to the rest of the food web when a species is added to or removed from a specific food web?

• Adding or removing a species causes the food web to collapse

• Adding or removing a species has no impact on the food web

• The rest of the food web remains unaffected

• The rest of the food web can be affected

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What happens in a negative feedback loop when the population of herbivores increases in an ecosystem?

• The herbivores population decreases

• The herbivores population increases

• The producer population increases

• The producer population decreases

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following correctly describes a food chain?

• A linear representation of energy transfer in an ecosystem

• A relationship graph showing trophic interactions in an ecosystem

• A series of events that occur when a predator impacts lower tropic levels

• A mechanism that maintains balance and stability in ecosystems

Tags

NGSS.MS-LS2-3

Which type of feedback loop helps to maintain balance and stability in ecosystems?

• positive feedback loops

• both negative and positive feedback loops

• feedback loops are not relevant to ecosystems

• negative feedback loops