9.2 Sustainability

What is the role of producers in an ecosystem?

• They consume other organisms for energy.

• They break down dead bodies and wastes.

• They control the population of other species.

• They make food through photosynthesis.

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Which process is primarily used by producers to make food?

• Respiration

• Digestion

• Photosynthesis

• Fermentation

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What do consumers rely on for their food source?

• Sunlight

• Ready-made source of food

• Water and minerals

• Carbon dioxide

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What does the arrow in a food chain represent?

• The flow of energy

• The flow of water

• The predator-prey relationship

• The direction of movement

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What is the role of decomposers in an ecosystem?

• They recycle matter for producers to reuse.

• They produce food for other organisms.

• They consume other organisms for energy.

• They increase biodiversity.

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Why is there a progressive loss of energy in ecosystems?

• Because energy is converted into unusable forms

• Because energy is constantly being added to the ecosystem

• Because energy is stored and not used by organisms

• Because energy is destroyed when organisms die

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What do pyramids of biomass show?

• The diversity of species in an ecosystem

• The total mass of organisms at each stage of a food chain

• The speed of energy flow through the food chain

• The number of organisms at each stage of a food chain

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How does biodiversity contribute to the stability of an ecosystem?

• By ensuring rapid energy flow

• By reducing the number of producers

• By increasing the number of decomposers

• By making the ecosystem more resilient to changes

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What happens to predator and prey numbers in a balanced ecosystem?

• A rise in prey numbers is followed by a rise in predator numbers

• Prey numbers remain constant regardless of predator numbers

• Predator numbers increase as prey numbers decrease

• Predator numbers decrease as prey numbers increase

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