IB ESS Pre assessment Topic 2

What defines an ecosystem?

• A community of organisms and their abiotic environment

• A single species living in a habitat

• The variety of species in an area

• A group of populations interacting

What measures an ecosystem’s ability to withstand and recover from disturbance?

• Stability

• Productivity

• Resilience

• Biodiversity

Which term describes an organism's role in an ecosystem?

• Habitat

• Niche

• Community

• Population

Which of the following is an example of mutualism?

• A lion hunting a zebra

• Barnacles attaching to a whale

• Bees pollinating flowers

• A parasite feeding on a host

Tags

NGSS.MS-LS2-2

What does carrying capacity represent?

• The number of predators in an ecosystem

• The maximum population an ecosystem can support

• The available food supply in a habitat

• The total biomass in an ecosystem

Tags

NGSS.MS-LS2-4

What is an example of commensalism?

• A bird eating ticks off a cow

• A remora fish attaching to a shark for transportation

• A mosquito feeding on human blood

• A bee pollinating a flower

Tags

NGSS.MS-LS2-2

What is the ultimate source of energy for most ecosystems?

• Decomposers

• The sun

• Chemical energy

• Primary consumers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

What is the correct order of trophic levels in a food chain?

• Primary consumer → Producer → Secondary consumer → Decomposer

• Producer → Primary consumer → Secondary consumer → Tertiary consumer

• Decomposer → Producer → Consumer

• Predator → Prey → Herbivore → Producer

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

If a producer in an ecosystem captures 10,000 kJ of energy from the sun, how much energy is typically available to a primary consumer?

• 10,000 kJ

• 1,000 kJ

• 100 kJ

• 10 kJ

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

What happens when a population reaches its carrying capacity?

• The population continues to grow exponentially

• The population declines immediately

• Growth slows and stabilizes in an S-shaped logistic curve

• The population goes extinct