Educational worksheet on ecosystem cycles, focusing on the water cycle and carbon/nitrogen cycles with fill-in-the-blank and true/false questions.
A worksheet titled "Ecosystem Cycles" with questions about the water cycle and carbon/nitrogen cycles, including matching terms and true/false statements.
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Show Answer Key & Explanations
Step-by-step solution for: Water Carbon And Nitrogen Cycle Worksheet | Nutrient cycle, Water ...
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Show Answer Key & Explanations
Step-by-step solution for: Water Carbon And Nitrogen Cycle Worksheet | Nutrient cycle, Water ...
Let's go through the worksheet step by step and solve each part.
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Choose the correct letter (A–F) for each description.
1. Liquid water heats and changes to water vapor, a gas in the atmosphere.
→ This is evaporation.
✔ C. evaporation
2. Water returns to Earth in the form of rain, snow, sleet, or hail.
→ This is precipitation.
✔ E. precipitation
3. Water vapor in the air rises, cools, and changes back to liquid form, collecting on dust particles to form clouds.
→ This is condensation.
✔ D. condensation
4. Water flows over the land back to water sources such as rivers, lakes, streams, and oceans.
→ This is runoff.
✔ F. runoff
5. Water collects in underground streams that flow into larger bodies of water.
→ This is groundwater.
✔ A. groundwater
6. Water vapor is released from the leaves of plants into the atmosphere.
→ This is transpiration.
✔ B. transpiration
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7. (Nitrogen / Carbon) has to be “fixed” by bacteria before producers can use it.
→ Nitrogen must be fixed by bacteria (e.g., nitrogen-fixing bacteria).
✔ Nitrogen
8. Plants release (oxygen / carbon dioxide), which is taken in by animals in the ecosystem.
→ Plants release oxygen during photosynthesis.
✔ oxygen
9. Carbon dioxide in the atmosphere is taken in by (plants / animals).
→ Plants take in CO₂ for photosynthesis.
✔ plants
10. (Producers / Decomposers) break down the dead organisms in an ecosystem and return (water / carbon) to the soil.
→ Decomposers break down dead matter. They return carbon (and other nutrients) to the soil.
✔ Decomposers, carbon
11. When humans burn fossil fuels, they (add / remove) carbon dioxide (to / from) the atmosphere.
→ Burning fossil fuels releases CO₂ into the atmosphere.
✔ add, to
12. Water vapor in the air (cools / warms) to condense and form clouds.
→ Condensation occurs when water vapor cools.
✔ cools
13. During the nitrogen cycle, organisms use nitrogen compounds available in the (soil / air).
→ While nitrogen is in the air (78%), organisms access it primarily in soil as compounds (like nitrates).
✔ soil
14. Liquid water returns to gas form in the atmosphere through the process of (evaporation / precipitation).
→ Evaporation turns liquid to gas. Precipitation is liquid falling from sky.
✔ evaporation
15. Matter, such as water, carbon, and nitrogen, can all be (lost / recycled) in an ecosystem.
→ These elements are recycled in biogeochemical cycles.
✔ recycled
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16. Explain why decomposers are an important part of the carbon and nitrogen cycles.
✔ Answer:
Decomposers (like bacteria and fungi) break down dead organisms and waste materials, releasing nutrients such as carbon and nitrogen back into the soil and atmosphere. In the carbon cycle, they decompose organic matter and release carbon dioxide (CO₂) through respiration. In the nitrogen cycle, they convert organic nitrogen into forms like ammonium and nitrate, making it available again for plants. Without decomposers, nutrients would remain locked in dead matter, disrupting the flow of matter in ecosystems.
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17. Why are diagrams that show how matter moves through organisms and the environment called cycles?
✔ Answer:
These diagrams are called cycles because the movement of matter (like water, carbon, and nitrogen) is continuous and repeated. Elements are constantly being transformed, used by living organisms, and returned to the environment. The process repeats over and over without being lost from the system (in closed systems), forming a circular pattern—hence, a cycle.
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#### Part 1:
1. C
2. E
3. D
4. F
5. A
6. B
#### Part 2:
7. Nitrogen
8. oxygen
9. plants
10. Decomposers, carbon
11. add, to
12. cools
13. soil
14. evaporation
15. recycled
#### Part 3:
16. Decomposers break down dead organisms and return essential nutrients like carbon and nitrogen to the soil and atmosphere, allowing them to be reused by producers. Without them, these nutrients would not be recycled.
17. They are called cycles because the movement of matter is continuous and repetitive, with elements being reused over and over in a circular pattern.
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Part 1: Identify the parts of the water cycle
Choose the correct letter (A–F) for each description.
1. Liquid water heats and changes to water vapor, a gas in the atmosphere.
→ This is evaporation.
✔ C. evaporation
2. Water returns to Earth in the form of rain, snow, sleet, or hail.
→ This is precipitation.
✔ E. precipitation
3. Water vapor in the air rises, cools, and changes back to liquid form, collecting on dust particles to form clouds.
→ This is condensation.
✔ D. condensation
4. Water flows over the land back to water sources such as rivers, lakes, streams, and oceans.
→ This is runoff.
✔ F. runoff
5. Water collects in underground streams that flow into larger bodies of water.
→ This is groundwater.
✔ A. groundwater
6. Water vapor is released from the leaves of plants into the atmosphere.
→ This is transpiration.
✔ B. transpiration
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Part 2: Circle the correct word(s) to make the statement true
7. (Nitrogen / Carbon) has to be “fixed” by bacteria before producers can use it.
→ Nitrogen must be fixed by bacteria (e.g., nitrogen-fixing bacteria).
✔ Nitrogen
8. Plants release (oxygen / carbon dioxide), which is taken in by animals in the ecosystem.
→ Plants release oxygen during photosynthesis.
✔ oxygen
9. Carbon dioxide in the atmosphere is taken in by (plants / animals).
→ Plants take in CO₂ for photosynthesis.
✔ plants
10. (Producers / Decomposers) break down the dead organisms in an ecosystem and return (water / carbon) to the soil.
→ Decomposers break down dead matter. They return carbon (and other nutrients) to the soil.
✔ Decomposers, carbon
11. When humans burn fossil fuels, they (add / remove) carbon dioxide (to / from) the atmosphere.
→ Burning fossil fuels releases CO₂ into the atmosphere.
✔ add, to
12. Water vapor in the air (cools / warms) to condense and form clouds.
→ Condensation occurs when water vapor cools.
✔ cools
13. During the nitrogen cycle, organisms use nitrogen compounds available in the (soil / air).
→ While nitrogen is in the air (78%), organisms access it primarily in soil as compounds (like nitrates).
✔ soil
14. Liquid water returns to gas form in the atmosphere through the process of (evaporation / precipitation).
→ Evaporation turns liquid to gas. Precipitation is liquid falling from sky.
✔ evaporation
15. Matter, such as water, carbon, and nitrogen, can all be (lost / recycled) in an ecosystem.
→ These elements are recycled in biogeochemical cycles.
✔ recycled
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Part 3: Short Answer Questions
16. Explain why decomposers are an important part of the carbon and nitrogen cycles.
✔ Answer:
Decomposers (like bacteria and fungi) break down dead organisms and waste materials, releasing nutrients such as carbon and nitrogen back into the soil and atmosphere. In the carbon cycle, they decompose organic matter and release carbon dioxide (CO₂) through respiration. In the nitrogen cycle, they convert organic nitrogen into forms like ammonium and nitrate, making it available again for plants. Without decomposers, nutrients would remain locked in dead matter, disrupting the flow of matter in ecosystems.
---
17. Why are diagrams that show how matter moves through organisms and the environment called cycles?
✔ Answer:
These diagrams are called cycles because the movement of matter (like water, carbon, and nitrogen) is continuous and repeated. Elements are constantly being transformed, used by living organisms, and returned to the environment. The process repeats over and over without being lost from the system (in closed systems), forming a circular pattern—hence, a cycle.
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✔ Final Answers Summary:
#### Part 1:
1. C
2. E
3. D
4. F
5. A
6. B
#### Part 2:
7. Nitrogen
8. oxygen
9. plants
10. Decomposers, carbon
11. add, to
12. cools
13. soil
14. evaporation
15. recycled
#### Part 3:
16. Decomposers break down dead organisms and return essential nutrients like carbon and nitrogen to the soil and atmosphere, allowing them to be reused by producers. Without them, these nutrients would not be recycled.
17. They are called cycles because the movement of matter is continuous and repetitive, with elements being reused over and over in a circular pattern.
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Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of water carbon and nitrogen cycle worksheet.
