1/16 Bell Ringer

Which statement accurately describes energy transfer in an ecosystem?

• 90% of energy is transferred between trophic levels

• All energy in an ecosystem comes from decomposers

• Only 10% of energy transfers between trophic levels

• Energy flow in food chains moves from consumers to producers

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In a food web containing a hawk, snake, mouse, and grass, how many distinct food chains can be identified?

• Four food chains

• Two food chains

• Three food chains

• One food chain

Tags

NGSS.MS-LS2-3

If you start with 10,000 kcal at the producer level, how many kcal would be available at the secondary consumer level?

• 100 kcal

• 1,000 kcal

• 10 kcal

• 500 kcal

Tags

NGSS.MS-LS2-3

Analyze the following scenario: If a disease eliminated all snakes from the ecosystem shown in the food web, what would be the most likely long-term impact?

• Mouse population would increase while hawk population decreases

• Fox population would increase dramatically

• Rabbit population would remain stable

• All consumer populations would collapse

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Design a sustainable food web modification that would maintain ecosystem balance if the grass population suddenly decreased by 75%. Which combination would be most effective?

• Add more secondary consumers

• Introduce multiple new producer species

• Remove top predators

• Increase primary consumer diversity

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5