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Step-by-step solution for: Photosynthesis worksheet: Fill out & sign online | DocHub
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Show Answer Key & Explanations
Step-by-step solution for: Photosynthesis worksheet: Fill out & sign online | DocHub
Here is the completed Photosynthesis Worksheet with detailed answers and explanations for each question. This is suitable for a 7th-grade science level.
---
Name: _________________________
Date: _________________________
Period: _______
7th Grade Science
Mr. McAninch
Photosynthesis Worksheet
---
Answer:
$$
6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2
$$
Explanation:
This equation shows that carbon dioxide (CO₂) and water (H₂O), in the presence of light energy, are converted into glucose (C₆H₁₂O₆) and oxygen (O₂). The process occurs in plants, algae, and some bacteria.
---
Answer:
The reaction for cellular respiration is the reverse of photosynthesis:
$$
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}
$$
Explanation:
Photosynthesis stores energy in glucose using light, while cellular respiration releases that stored energy by breaking down glucose. They are complementary processes: one produces food and oxygen, the other uses food and oxygen to produce energy.
---
Answer:
The energy comes from sunlight (solar energy).
Explanation:
Plants capture sunlight using pigments like chlorophyll. This light energy is used to power the chemical reactions that convert CO₂ and H₂O into glucose and O₂.
---
Answer:
The main pigments are chlorophyll a, chlorophyll b, and accessory pigments like carotenoids (e.g., beta-carotene).
Explanation:
Chlorophyll a and b absorb blue and red light most efficiently and reflect green light, giving leaves their green color. Carotenoids absorb blue-green light and help protect the plant from damage by excess light.
---
Answer:
Chlorophyll absorbs blue and red wavelengths of light but reflects the green wavelengths.
Explanation:
When white light (which contains all colors) hits a chlorophyll molecule, it absorbs the blue and red parts of the spectrum to use in photosynthesis. The green light is not absorbed — instead, it is reflected back to our eyes. That’s why we see the plant as green.
---
Answer:
Photosynthesis takes place in the chloroplasts.
Explanation:
Chloroplasts are specialized organelles found in plant cells and some protists. They contain chlorophyll and have internal structures (thylakoids and stroma) where the light-dependent and light-independent reactions occur.
---
Answer:
The waste product is oxygen (O₂).
Explanation:
During photosynthesis, water molecules are split to provide electrons and hydrogen ions. Oxygen is released as a byproduct when water is broken down. This oxygen is essential for most living organisms to survive.
---
Answer:
$$
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}
$$
Explanation:
Cells break down glucose in the presence of oxygen to release energy stored in ATP. Carbon dioxide and water are produced as waste products.
---
Answer:
Cellular respiration primarily takes place in the mitochondria.
Explanation:
Mitochondria are known as the "powerhouses" of the cell because they generate most of the cell's ATP through aerobic respiration. While some steps happen in the cytoplasm, the main energy-producing stages occur in the mitochondria.
---
Answer:
The waste products are carbon dioxide (CO₂) and water (H₂O).
Explanation:
During cellular respiration, glucose is broken down, producing CO₂ as a byproduct of the Krebs cycle and H₂O from the electron transport chain. These are exhaled or removed from the body.
---
✔ Summary Table for Comparison:
| Feature | Photosynthesis | Cellular Respiration |
|--------|----------------|----------------------|
| Inputs | CO₂, H₂O, Light | Glucose, O₂ |
| Outputs | Glucose, O₂ | CO₂, H₂O, Energy (ATP) |
| Energy | Stores energy | Releases energy |
| Organelle | Chloroplast | Mitochondrion |
| Waste Product | O₂ | CO₂ and H₂O |
---
Let me know if you'd like this formatted as a printable PDF or need a version with blank spaces for students to fill in!
---
Name: _________________________
Date: _________________________
Period: _______
7th Grade Science
Mr. McAninch
Photosynthesis Worksheet
---
1. What is the overall reaction (formula) for photosynthesis?
Answer:
$$
6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2
$$
Explanation:
This equation shows that carbon dioxide (CO₂) and water (H₂O), in the presence of light energy, are converted into glucose (C₆H₁₂O₆) and oxygen (O₂). The process occurs in plants, algae, and some bacteria.
---
2. How does this compare to the overall reaction for cellular respiration?
Answer:
The reaction for cellular respiration is the reverse of photosynthesis:
$$
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}
$$
Explanation:
Photosynthesis stores energy in glucose using light, while cellular respiration releases that stored energy by breaking down glucose. They are complementary processes: one produces food and oxygen, the other uses food and oxygen to produce energy.
---
3. Where does the energy for photosynthesis come from?
Answer:
The energy comes from sunlight (solar energy).
Explanation:
Plants capture sunlight using pigments like chlorophyll. This light energy is used to power the chemical reactions that convert CO₂ and H₂O into glucose and O₂.
---
4. What plant pigments are involved in photosynthesis?
Answer:
The main pigments are chlorophyll a, chlorophyll b, and accessory pigments like carotenoids (e.g., beta-carotene).
Explanation:
Chlorophyll a and b absorb blue and red light most efficiently and reflect green light, giving leaves their green color. Carotenoids absorb blue-green light and help protect the plant from damage by excess light.
---
5. Explain why chlorophyll appears green to us in terms of what happens to different wavelengths of light that strike a chlorophyll molecule.
Answer:
Chlorophyll absorbs blue and red wavelengths of light but reflects the green wavelengths.
Explanation:
When white light (which contains all colors) hits a chlorophyll molecule, it absorbs the blue and red parts of the spectrum to use in photosynthesis. The green light is not absorbed — instead, it is reflected back to our eyes. That’s why we see the plant as green.
---
6. In what organelle of a plant cell does photosynthesis take place?
Answer:
Photosynthesis takes place in the chloroplasts.
Explanation:
Chloroplasts are specialized organelles found in plant cells and some protists. They contain chlorophyll and have internal structures (thylakoids and stroma) where the light-dependent and light-independent reactions occur.
---
7. What is photosynthesis waste product?
Answer:
The waste product is oxygen (O₂).
Explanation:
During photosynthesis, water molecules are split to provide electrons and hydrogen ions. Oxygen is released as a byproduct when water is broken down. This oxygen is essential for most living organisms to survive.
---
8. What is the overall reaction (formula) for cell respiration?
Answer:
$$
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}
$$
Explanation:
Cells break down glucose in the presence of oxygen to release energy stored in ATP. Carbon dioxide and water are produced as waste products.
---
9. In what organelle of a cell does cell respiration take place?
Answer:
Cellular respiration primarily takes place in the mitochondria.
Explanation:
Mitochondria are known as the "powerhouses" of the cell because they generate most of the cell's ATP through aerobic respiration. While some steps happen in the cytoplasm, the main energy-producing stages occur in the mitochondria.
---
10. What is cell respiration’s waste product?
Answer:
The waste products are carbon dioxide (CO₂) and water (H₂O).
Explanation:
During cellular respiration, glucose is broken down, producing CO₂ as a byproduct of the Krebs cycle and H₂O from the electron transport chain. These are exhaled or removed from the body.
---
✔ Summary Table for Comparison:
| Feature | Photosynthesis | Cellular Respiration |
|--------|----------------|----------------------|
| Inputs | CO₂, H₂O, Light | Glucose, O₂ |
| Outputs | Glucose, O₂ | CO₂, H₂O, Energy (ATP) |
| Energy | Stores energy | Releases energy |
| Organelle | Chloroplast | Mitochondrion |
| Waste Product | O₂ | CO₂ and H₂O |
---
Let me know if you'd like this formatted as a printable PDF or need a version with blank spaces for students to fill in!
Parent Tip: Review the logic above to help your child master the concept of photosynthesis worksheet middle school.
