Photosynthesis and cellular respiration worksheet: Fill out & sign ... - Free Printable

Let's solve this Photosynthesis & Cellular Respiration Worksheet step by step and explain each answer clearly.

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Vocabulary: Match the phrases on the left with the term that best fits.

We are given a list of definitions (1–10) and a list of terms (A–J). We need to match them correctly.

| Number | Phrase | Best Match | Explanation |
|--------|--------|------------|-----------|
| 1 | Organisms that make their own food | J. Autotrophs | Autotrophs (like plants) produce their own food via photosynthesis. |
| 2 | Site of photosynthesis | A. Chloroplasts | Photosynthesis occurs in chloroplasts in plant cells. |
| 3 | Process occurs in cytoplasm | G. Glycolysis | Glycolysis is the first step of cellular respiration and takes place in the cytoplasm. |
| 4 | C₆H₁₂O₆ | D. Glucose | This is the chemical formula for glucose, a sugar used in both processes. |
| 5 | Process does not require oxygen | B. Anaerobic | Anaerobic processes occur without oxygen (e.g., fermentation). |
| 6 | Process requires oxygen | C. Aerobic | Aerobic processes require oxygen (e.g., aerobic respiration). |
| 7 | Adenosine triphosphate | E. ATP | ATP stands for adenosine triphosphate — the energy currency of the cell. |
| 8 | Energy storing molecule | E. ATP | ATP stores and transfers energy in cells. |
| 9 | The anaerobic process of splitting glucose and forming two molecules of pyruvic acid | G. Glycolysis | Glycolysis splits glucose into pyruvate without oxygen. |
| 10 | The ability to do work | H. Energy | Energy is the capacity or ability to do work. |

> ✔ So the answers are:
>
> 1. J
> 2. A
> 3. G
> 4. D
> 5. B
> 6. C
> 7. E
> 8. E
> 9. G
> 10. H

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11. Fill out the table below:

| | Cellular Respiration | Photosynthesis |
|---|--------------------------|--------------------|
| Reactants | Glucose (C₆H₁₂O₆) + Oxygen (O₂) | Carbon dioxide (CO₂) + Water (H₂O) |
| Products | Carbon dioxide (CO₂) + Water (H₂O) + Energy (ATP) | Glucose (C₆H₁₂O₆) + Oxygen (O₂) |
| What organelle? | Mitochondria | Chloroplasts |

> 🔍 Explanation:
> - Cellular Respiration: Breaks down glucose using oxygen to produce ATP (energy), CO₂, and H₂O. Occurs in mitochondria.
> - Photosynthesis: Uses CO₂ and H₂O with sunlight to make glucose and O₂. Occurs in chloroplasts.

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12. Use the picture to help you describe the relationship between photosynthesis and cellular respiration:

> ✔ Answer:
> Photosynthesis and cellular respiration are complementary processes that form a cycle in ecosystems. During photosynthesis, plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. The glucose serves as food for the plant and other organisms. During cellular respiration, organisms (including plants and animals) break down glucose in the presence of oxygen to release energy (ATP), producing carbon dioxide and water as waste products. The CO₂ and H₂O produced during respiration are then used again by plants in photosynthesis. This creates a continuous cycle: the products of one process become the reactants of the other.

> 🔄 In short:
> Photosynthesis produces the food and oxygen that cellular respiration uses; cellular respiration produces the CO₂ and H₂O that photosynthesis uses.

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13. What kind(s) of organisms perform photosynthesis?

> ✔ Answer:
> Autotrophs, such as plants, algae, and some bacteria (like cyanobacteria), perform photosynthesis. These organisms can produce their own food using light energy.

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14. What kind(s) of organisms perform cellular respiration?

> ✔ Answer:
> All living organisms perform cellular respiration. This includes plants, animals, fungi, and most bacteria. Even though plants do photosynthesis, they also undergo cellular respiration to generate energy at night or in non-photosynthetic parts (like roots).

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✔ Final Summary Answers:

#### Vocabulary Matching:
1. J
2. A
3. G
4. D
5. B
6. C
7. E
8. E
9. G
10. H

#### Table:
| | Cellular Respiration | Photosynthesis |
|---|--------------------------|--------------------|
| Reactants | Glucose + Oxygen | CO₂ + H₂O |
| Products | CO₂ + H₂O + ATP | Glucose + Oxygen |
| Organelle | Mitochondria | Chloroplasts |

#### Question 12 (Relationship):
Photosynthesis and cellular respiration are interdependent processes. Photosynthesis produces glucose and oxygen from CO₂ and water using sunlight, while cellular respiration breaks down glucose using oxygen to produce ATP, releasing CO₂ and water. The products of one process serve as reactants for the other, forming a continuous energy and matter cycle in ecosystems.

#### Question 13:
Plants, algae, and some bacteria (like cyanobacteria) perform photosynthesis.

#### Question 14:
All living organisms, including plants, animals, fungi, and most bacteria, perform cellular respiration.

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