Unit 4 Review

A living thing that makes its own food using sunlight is called what?

• Producer (or Autotroph)

• Consumer (or Heterotroph)

• Decomposer

• Parasite

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What is the main source of energy for most food chains?

• The Sun

• The Moon

• Wind

• Soil

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What is the difference between a consumer and a decomposer?

• A consumer eats other organisms for energy, while a decomposer breaks down dead organisms and recycles nutrients back into the ecosystem.

• A consumer produces its own food, while a decomposer eats only plants.

• A consumer only eats plants, while a decomposer only eats animals.

• A consumer recycles nutrients, while a decomposer stores energy from the sun.

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What would happen to an ecosystem if decomposers disappeared?

• Dead plants and animals would accumulate, and nutrients would not be recycled back into the ecosystem.

• Plants would grow faster due to more available nutrients.

• Predators would become the most important organisms in the ecosystem.

• The amount of sunlight in the ecosystem would increase.

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Explain the difference between a food chain and a food web.

• A food chain shows a single path of energy flow, while a food web shows multiple interconnected food chains in an ecosystem.

• A food chain and a food web both show only one organism eating another in a straight line.

• A food web shows only producers and consumers, while a food chain shows all organisms.

• A food chain shows energy flow in a circle, while a food web shows energy flow in a straight line.

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What gas do plants take in during photosynthesis?

• Carbon dioxide (CO2)

• Oxygen (O2)

• Nitrogen (N2)

• Hydrogen (H2)

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What are the three reactants of photosynthesis?

• Carbon dioxide, water, and sunlight

• Oxygen, glucose, and sunlight

• Nitrogen, water, and oxygen

• Carbon dioxide, oxygen, and glucose

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The two products of photosynthesis are:

• Oxygen and glucose

• Carbon dioxide and water

• Oxygen and carbon dioxide

• Glucose and nitrogen

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Fill in the blank: ☀️ + CO2 + H2O → Glucose + _____

• Oxygen

• Nitrogen

• Methane

• Sulfur dioxide

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Photosynthesis is important for both plants and animals because it:

• produces oxygen and food needed by living organisms.

• removes water from the soil.

• prevents animals from eating plants.

• causes plants to grow in the dark.

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