Ch. 4.1 and 4.2 Review Questions

What is a food chain?

• A series of steps in which organisms transfer energy by eating and being eaten

• A network of complex interactions formed by the feeding relationships among organisms

• A model that shows the relative amount of energy available at each trophic level

• The total mass of living tissue within a trophic level

Tags

NGSS.MS-LS2-3

What is a food web?

• A network of complex interactions formed by the feeding relationships among organisms

• A series of steps in which organisms transfer energy by eating and being eaten

• A model that shows the relative amount of energy available at each trophic level

• The total mass of living tissue within a trophic level

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

How does energy flow in an ecosystem?

• From consumers to primary producers

• From primary producers through various consumers

• In a random and unpredictable manner

• In multiple directions within a food web

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the role of decomposers in food webs?

• They regulate the population of primary consumers

• They provide energy to primary producers through photosynthesis

• They directly consume primary producers

• They convert dead material to detritus, which is eaten by detritivores

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

How do changes in a food web affect ecosystems?

• Changes only affect the top predators

• Changes only affect the primary producers

• Changes always have a positive impact on ecosystems

• The effects are hard to predict and can be minor or dramatic

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What do ecological pyramids represent?

• The average lifespan of organisms in each trophic level

• The total number of organisms in each trophic level

• The relative amount of energy or matter in each trophic level

• The genetic diversity within each trophic level

Tags

NGSS.MS-LS2-3

What is the shape of a pyramid of energy?

• Widest at the bottom and narrowest at the top

• Narrowest at the bottom and widest at the top

• Symmetrical with equal width at each level

• Irregular and unpredictable

What is the average energy transfer between trophic levels?

• About 10%

• About 75%

• About 25%

• About 50%

Tags

NGSS.MS-LS2-3

What is biomass?

• The total genetic diversity within a trophic level

• The total mass of living tissue within a trophic level

• The total number of organisms within a trophic level

• The total energy available within a trophic level

Tags

NGSS.HS-LS2-4

What is a pyramid of numbers?

• A model that shows the relative number of individual organisms at each trophic level

• A model that shows the relative amount of energy available at each trophic level

• A model that shows the average lifespan of organisms at each trophic level

• A model that shows the genetic diversity within each trophic level