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8.1 - The Components of an ecosystem

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An ecosystem is best defined as

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✅EvaluateQuestion 2 of 21

Which of the following is an abiotic component of an ecosystem?

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✅EvaluateQuestion 3 of 21

In most ecosystems, the main source of energy is

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✅EvaluateQuestion 4 of 21

Green plants are called producers because they

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✅EvaluateQuestion 5 of 21

Which organism is most likely to be a decomposer?

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✅EvaluateQuestion 6 of 21

Humus is best described as

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✅EvaluateQuestion 7 of 21

Which factor MOST directly links climate to ecosystem growth?

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✅EvaluateQuestion 8 of 21

A student observes a school garden in Jamaica. Which pair shows ONE biotic and ONE abiotic component?

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✅EvaluateQuestion 9 of 21

A simple food chain in a Caribbean mangrove could be: mangrove leaves → crab → fish → heron. In this chain, the crab is a

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✅EvaluateQuestion 10 of 21

During a drought, rainfall drops sharply across an island. The most immediate ecosystem effect is likely to be

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✅EvaluateQuestion 11 of 21

A farmer in Barbados adds compost to sandy soil. This mainly improves the ecosystem by increasing

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✅EvaluateQuestion 12 of 21

Which human activity is MOST likely to reduce biodiversity in a coastal wetland ecosystem?

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✅EvaluateQuestion 13 of 21

An ecosystem with high biomass is usually one where

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✅EvaluateQuestion 14 of 21

In a coral reef ecosystem, which change would MOST directly affect the abiotic environment?

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✅EvaluateQuestion 15 of 21

A mangrove area is cleared for a coastal road. Which combination of effects is MOST likely?

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✅EvaluateQuestion 16 of 21

Energy flow and nutrient cycling are both important in ecosystems. Which statement is correct?

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✅EvaluateQuestion 17 of 21

In a forest ecosystem, a disease kills many decomposers. What is the MOST likely longer-term effect?

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✅EvaluateQuestion 18 of 21

A hillside is deforested in Dominica. After heavy rainfall, the river below becomes muddy and plants near the bank grow poorly. Which explanation best links ecosystem components?

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✅EvaluateQuestion 19 of 21

Two areas have the same fertile soil, but Area X receives 2,000 mm rainfall/year and Area Y receives 500 mm/year. If other factors are similar, which outcome is MOST likely?

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A new invasive predator is introduced to a small island ecosystem and reduces the number of lizards (mid-level consumers). Which change is MOST likely in the food web?

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✅EvaluateQuestion 21 of 21

A student claims: “Because humans are part of ecosystems, every human activity must improve ecosystems.” Which response is MOST accurate?

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✅EvaluateQuestion 1 of 21

An ecosystem is best defined as

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