Let’s solve the problems step by step.
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Left Panel: Carbon Cycle
1.
How is carbon removed from the atmosphere?
Plants take in carbon dioxide (CO₂) from the air to make food through photosynthesis. So, plants remove carbon from the atmosphere.
2.
How would the loss of green plants impact the carbon cycle?
If there are no green plants, less CO₂ is taken out of the air. This means more CO₂ stays in the atmosphere, which can lead to global warming. Also, animals that eat plants would have no food, so the whole food chain breaks down.
3.
How is carbon used by animals?
Animals eat plants (or other animals that ate plants). The carbon in the plants becomes part of the animal’s body — used for energy, growth, and making new cells.
4.
What happens to the carbon in an animal after it dies?
When an animal dies, decomposers like bacteria and fungi break down its body. They release carbon back into the soil or as CO₂ into the air.
5.
How does human activity impact the carbon cycle?
Humans burn fossil fuels (like coal, oil, gas), cut down forests, and produce waste. All these add extra CO₂ to the atmosphere faster than nature can remove it, causing climate change.
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Right Panel: Nitrogen Cycle
1.
Why is the availability of nitrogen to plants and animals limited?
Even though air is mostly nitrogen gas (N₂), most plants and animals can’t use it directly. They need nitrogen in special forms like nitrates or ammonium — which only certain bacteria can make.
2.
How does nitrogen enter the atmosphere?
Nitrogen enters the atmosphere when bacteria in soil or water break down dead organisms and waste, releasing nitrogen gas (N₂) back into the air. This is called denitrification.
3.
Why are bacteria involved in the nitrogen cycle?
Bacteria are the only ones that can turn atmospheric nitrogen (N₂) into usable forms (like nitrates) for plants. Without them, plants couldn’t get the nitrogen they need to grow.
4.
What do plants need nitrogen for?
Plants need nitrogen to make proteins and DNA — essential for growing strong leaves, stems, and roots.
5.
What do animals need nitrogen for?
Animals get nitrogen by eating plants or other animals. They use it to build their own proteins and DNA — needed for muscles, skin, hair, and all body parts.
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✔ Final Answer:
Carbon Cycle Answers:
- Carbon is removed from the atmosphere by plants during photosynthesis.
- Loss of green plants would cause more CO₂ to stay in the air and disrupt food chains.
- Animals use carbon from food to build their bodies and get energy.
- After death, decomposers break down animals and release carbon back into soil or air.
- Human activities like burning fuels and deforestation add too much CO₂, speeding up climate change.
Nitrogen Cycle Answers:
- Nitrogen is limited because most organisms can’t use nitrogen gas — they need special forms made by bacteria.
- Nitrogen enters the atmosphere when bacteria convert nitrates back into nitrogen gas (denitrification).
- Bacteria convert nitrogen gas into usable forms and also return it to the air — they’re essential for the cycle.
- Plants need nitrogen to make proteins and DNA for growth.
- Animals need nitrogen to build their own proteins and DNA for body structure and function.
Parent Tip: Review the logic above to help your child master the concept of carbon and nitrogen cycle worksheet.
