7th Grade Ecosystems: Matter Cycling and Energy Flow

What role do plants play in an aquaponics system?

• A) They provide food for the fish.

• B) They convert fish waste into nutrients.

• C) They increase water temperature.

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Which of the following is a nonliving (abiotic) component of an aquaponics system?

• A) Fish

• • B) Water

• • C) Plants

• • D) Bacteria

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How does the air pump benefit the aquaponics system?

• • A) By cooling the water

• • B) By providing oxygen for the fish and plants

• • C) By removing waste products from the water

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True or False: In an aquaponics system, fish waste acts as a natural fertilizer for the plants.

• True

• False

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True or False: Rocks at the bottom of an aquaponics system can contribute to the rock cycle by breaking down into soil.

• True

• False

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Explain how an aquaponics system demonstrates the cycling of Earth's materials and the flow of energy.

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How do living (biotic) and nonliving (abiotic) components interact in an aquaponics system to mimic a river ecosystem?

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Why is it important to maintain a warm water temperature in an aquaponics system?

• • A) Warm water increases the oxygen level in the water, which is necessary for fish to breathe.

• • B) Warm water speeds up the growth of algae, providing more food for the fish.

• • C) Warm water ensures optimal conditions for fish health, plant growth, and bacterial activity necessary for nutrient cycling.

• • D) Warm water prevents the formation of ice, which can damage the aquaponics equipment.

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Which of the following best represents a simple river food chain?

• A) Algae → Trout → Eagle → Bacteria

• B) Bear → Salmon → Insect → Algae

• • C) Algae → Insect → Trout → Bear

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What happens during cellular respiration?

• • A) Plants turn sunlight into food.

• • B) Oxygen turns into carbon dioxide.

• • C) Food and oxygen are turned into energy, water, and carbon dioxide.

• • D) Water is used to make oxygen and glucose.

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