Educational worksheet for students to distinguish between photosynthesis and cellular respiration using key characteristics.

Absolutely! Let’s solve this step by step.

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## ✔ First, let’s write the word equations:

🌿 Word Equation for Photosynthesis:

> Carbon dioxide + Water → Glucose + Oxygen
*(in the presence of light and chlorophyll)*

🔥 Word Equation for Cellular Respiration:

> Glucose + Oxygen → Carbon dioxide + Water + Energy (ATP)

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## 🧩 Now, let’s analyze each clue and decide whether it describes Photosynthesis (P) or Cellular Respiration (R).

We’ll go one by one:

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#1. This happens in the chloroplast.

→ Photosynthesis — Chloroplasts are where photosynthesis occurs in plant cells.
✔ P

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#2. It requires light energy.

→ Photosynthesis — Light is essential to power the process.
✔ P

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#3. It produces carbon dioxide (CO₂).

→ Cellular Respiration — CO₂ is a waste product of respiration.
✔ R

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#4. It produces oxygen (O₂).

→ Photosynthesis — O₂ is released as a byproduct.
✔ P

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#5. One reactant is oxygen (O₂).

→ Cellular Respiration — Oxygen is needed to break down glucose.
✔ R

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#6. One reactant is glucose.

→ Cellular Respiration — Glucose is broken down for energy.
✔ R

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#7. It does not require light energy.

→ Cellular Respiration — Happens day and night, with or without light.
✔ R

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#8. It produces glucose.

→ Photosynthesis — Glucose is the main product.
✔ P

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#9. It produces chemical energy (ATP).

→ Cellular Respiration — ATP is the energy currency made during respiration.
✔ R

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#10. It needs carbon dioxide (CO₂) from the air.

→ Photosynthesis — CO₂ is a raw material taken in from the air.
✔ P

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#11. This happens in the mitochondria.

→ Cellular Respiration — Mitochondria are the “powerhouses” where respiration occurs.
✔ R

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#12. Only plants can perform this reaction.

→ Photosynthesis — Animals cannot perform photosynthesis; only autotrophs like plants and some microbes can.
✔ P

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#13. Both plants and animals can perform this reaction.

→ Cellular Respiration — All living cells need energy, so both plants and animals respire.
✔ R

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#14. It makes water.

→ Cellular Respiration — Water is a product when glucose and oxygen react.
✔ R

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#15. It needs water.

→ Photosynthesis — Water is a reactant (split during light reactions).
✔ P

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## ✔ Final Answer Key:

| # | Answer |
|----|--------|
| 1 | P |
| 2 | P |
| 3 | R |
| 4 | P |
| 5 | R |
| 6 | R |
| 7 | R |
| 8 | P |
| 9 | R |
| 10 | P |
| 11 | R |
| 12 | P |
| 13 | R |
| 14 | R |
| 15 | P |

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## 💡 Quick Summary:

- Photosynthesis = Plants make food using sunlight, CO₂, and water → produces glucose and O₂.
- Cellular Respiration = All living things break down glucose with O₂ → produces CO₂, water, and ATP.

They are essentially opposite processes — one stores energy, the other releases it!

Let me know if you want a diagram or mnemonic to remember them! 🌞🍃🔥