Photosynthesis and Cellular Respiration Worksheet with diagram showing energy flow and processes in an ecosystem.

Photosynthesis & Cellular Respiration Worksheet Solution

#### Vocabulary Matching
Match the phrases on the left with the term that best fits. Not all terms will be used, and some may be used more than once.

1. Organisms that make their own food
- Answer: J. Autotrophs
- Explanation: Autotrophs are organisms that can produce their own food using inorganic substances (e.g., carbon dioxide and water) through processes like photosynthesis.

2. Site of photosynthesis
- Answer: A. Chloroplasts
- Explanation: Photosynthesis occurs primarily in the chloroplasts of plant cells, which contain chlorophyll for capturing light energy.

3. Process occurs in cytoplasm
- Answer: G. Glycolysis
- Explanation: Glycolysis is the first stage of cellular respiration and occurs in the cytoplasm of cells.

4. C₆H₁₂O₆
- Answer: D. Glucose
- Explanation: C₆H₁₂O₆ is the chemical formula for glucose, a simple sugar that serves as an energy source in many biological processes.

5. Process does not require oxygen
- Answer: B. Anaerobic
- Explanation: Anaerobic processes do not require oxygen. Examples include anaerobic respiration or fermentation.

6. Process requires oxygen
- Answer: C. Aerobic
- Explanation: Aerobic processes require oxygen. Cellular respiration is an example of an aerobic process.

7. Adenosine triphosphate
- Answer: E. ATP
- Explanation: Adenosine triphosphate (ATP) is the primary energy currency of cells, used to power various cellular activities.

8. Energy storing molecule
- Answer: I. ADP
- Explanation: ADP (adenosine diphosphate) is a molecule that stores energy and can be converted to ATP when energy is needed.

9. The anaerobic process of splitting glucose and forming two molecules of pyruvic acid
- Answer: G. Glycolysis
- Explanation: Glycolysis is the initial step of both aerobic and anaerobic respiration, where glucose is split into two molecules of pyruvate.

10. The ability to do work
- Answer: H. Energy
- Explanation: Energy is defined as the ability to do work, such as powering cellular processes or moving objects.

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#### Fill out the table below:

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

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

- Photosynthesis:
- Occurs in chloroplasts of plants.
- Uses sunlight energy, carbon dioxide (CO₂), and water (H₂O) to produce glucose (C₆H₁₂O₆) and oxygen (O₂).
- Glucose serves as an energy source, and oxygen is released as a byproduct.

- Cellular Respiration:
- Occurs in mitochondria of cells (plants and animals).
- Uses glucose (C₆H₁₂O₆) and oxygen (O₂) to produce carbon dioxide (CO₂), water (H₂O), and ATP (energy).
- ATP provides energy for cellular activities, and heat is released as a byproduct.

- Relationship:
- Photosynthesis produces glucose and oxygen, which are essential inputs for cellular respiration.
- Cellular respiration breaks down glucose to release energy (ATP) and produces carbon dioxide and water, which are inputs for photosynthesis.
- This cycle demonstrates the interdependence of these two processes in maintaining life on Earth.

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

- Answer: Plants, algae, and certain bacteria (e.g., cyanobacteria).
- Explanation: These organisms contain chloroplasts or similar structures that allow them to capture sunlight and convert it into chemical energy through photosynthesis.

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

- Answer: All living organisms, including plants, animals, fungi, and bacteria.
- Explanation: Cellular respiration is a fundamental process used by all living cells to generate energy from nutrients, regardless of whether they perform photosynthesis.

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Final Answer Summary

1. J. Autotrophs
2. A. Chloroplasts
3. G. Glycolysis
4. D. Glucose
5. B. Anaerobic
6. C. Aerobic
7. E. ATP
8. I. ADP
9. G. Glycolysis
10. H. Energy

Table:
| | Cellular Respiration | Photosynthesis |
|---------------|---------------------------|---------------------|
| Reactants | Glucose (C₆H₁₂O₆), Oxygen (O₂) | Carbon dioxide (CO₂), Water (H₂O), Sunlight energy |
| Products | Carbon dioxide (CO₂), Water (H₂O), ATP (energy) | Glucose (C₆H₁₂O₆), Oxygen (O₂) |
| What organelle? | Mitochondria | Chloroplasts |

Question 12: Photosynthesis and cellular respiration are interconnected processes. Photosynthesis produces glucose and oxygen, which are used in cellular respiration to generate energy (ATP). Cellular respiration releases carbon dioxide and water, which are used in photosynthesis.

Question 13: Plants, algae, and certain bacteria perform photosynthesis.

Question 14: All living organisms perform cellular respiration.

Boxed Final Answer:
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\text{See detailed explanations above.}
}