Cycling of Matter and Energy in Ecosystems

What happens when rocks containing phosphorus are broken down?

• Phosphorus is absorbed by animals directly

• Phosphorus evaporates into the atmosphere

• Phosphorus is released as phosphates into the soil

• Phosphorus forms new rocks

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What is the role of phosphorus in living organisms?

• It is primarily used as a source of energy.

• It is a key component of DNA and other life-sustaining molecules.

• It helps in the digestion of proteins.

• It regulates body temperature.

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What is the role of decomposers in the cycling of matter?

• They break down dead organisms and return nutrients to the soil

• They consume glucose and use it for their own energy needs

• They return carbon to the atmosphere through respiration

• They capture energy from the sun and store it as chemical energy in glucose

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What happens to the carbon stored in glucose when animals eat plants?

• It is passed along the food chain

• It is released back into the atmosphere

• It is converted into oxygen

• It is absorbed by the soil

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What is the ultimate fate of the carbon that is returned to the atmosphere?

• It is eventually absorbed by plants through photosynthesis

• It is passed along the food chain

• It is absorbed by the soil

• It is converted into glucose

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What is the role of photosynthesis in the cycling of matter?

• Photosynthesis converts carbon dioxide to oxygen

• Photosynthesis captures oxygen and returns it to the atmosphere

• Photosynthesis converts oxygen to carbon dioxide

• Photosynthesis captures carbon and returns it to the atmosphere

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What is the role of herbivores in the cycling of matter?

• They return carbon to the atmosphere through respiration

• They capture energy from the sun and store it as chemical energy in glucose

• They eat plants and return nutrients to the soil

• They consume glucose and use it for their own energy needs

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What happens to the carbon captured by plants during photosynthesis?

• It is used for plant growth

• It is stored in glucose

• It is converted to oxygen

• It is released into the atmosphere as carbon dioxide

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What is the role of respiration in the cycling of matter?

• It converts carbon dioxide to oxygen

• It captures oxygen and returns it to the atmosphere

• It captures carbon and returns it to the atmosphere

• It converts oxygen to carbon dioxide

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What is the ultimate fate of the carbon captured by plants during photosynthesis?

• It is converted to oxygen

• It is released into the atmosphere as carbon dioxide

• It is stored in the soil

• It is used for plant growth

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