SOLUTION: Photosynthesis worksheet - Studypool - Free Printable
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Step-by-step solution for: SOLUTION: Photosynthesis worksheet - Studypool
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Show Answer Key & Explanations
Step-by-step solution for: SOLUTION: Photosynthesis worksheet - Studypool
Here is the completed Photosynthesis Worksheet with detailed answers and explanations for each question:
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1. How would you define photosynthesis?
Answer:
Photosynthesis is a biological process by which green plants, algae, and some bacteria convert light energy (usually from the sun) into chemical energy stored in glucose. This process uses carbon dioxide (CO₂) from the air and water (H₂O) from the soil, in the presence of chlorophyll and sunlight, to produce glucose (C₆H₁₂O₆) and oxygen (O₂) as a byproduct.
Explanation:
Photosynthesis is essential for life on Earth because it produces oxygen and forms the base of the food chain by creating organic compounds that other organisms consume.
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2. What is the photosynthesis equation?
Answer:
6CO₂ + 6H₂O + Light Energy → C₆H₁₂O₆ + 6O₂
Explanation:
This balanced chemical equation shows that six molecules of carbon dioxide and six molecules of water, using light energy, are converted into one molecule of glucose and six molecules of oxygen. The reaction occurs in the chloroplasts of plant cells.
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3. How many stages of photosynthesis are there?
Answer:
There are two main stages of photosynthesis:
1. Light-dependent reactions
2. Light-independent reactions (Calvin cycle)
Explanation:
- The light-dependent reactions occur in the thylakoid membranes of the chloroplast and require light to produce ATP and NADPH.
- The light-independent reactions (Calvin cycle) take place in the stroma and use ATP and NADPH to fix carbon dioxide into glucose.
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4. What is the role of chlorophyll in Photosynthesis?
Answer:
Chlorophyll is the green pigment found in chloroplasts that absorbs light energy (mainly red and blue wavelengths) and converts it into chemical energy during the light-dependent reactions.
Explanation:
Chlorophyll captures photons from sunlight and uses this energy to excite electrons, initiating the electron transport chain that leads to the production of ATP and NADPH. It reflects green light, which is why plants appear green.
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5. During photosynthesis plants absorb water from?
Answer:
Plants absorb water from the soil through their roots.
Explanation:
Water is absorbed by root hairs via osmosis and transported upward through the xylem to the leaves, where it is used in the light-dependent reactions of photosynthesis.
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6. During photosynthesis plants absorb carbon dioxide from?
Answer:
Plants absorb carbon dioxide from the atmosphere through tiny openings called stomata in the leaves.
Explanation:
Stomata open during the day to allow CO₂ to enter the leaf for use in the Calvin cycle. They also allow oxygen to exit and water vapor to escape during transpiration.
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7. During photosynthesis which light wavelengths are absorbed by plants to carry out the process of photosynthesis?
Answer:
Plants primarily absorb blue light (around 430–450 nm) and red light (around 640–680 nm).
Explanation:
Chlorophyll a and b absorb these wavelengths most efficiently. Green light (around 500–570 nm) is reflected, which is why plants appear green. Other pigments like carotenoids absorb light in the blue-green and green regions, extending the range of usable light.
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8. Mention the site of the light-dependent reaction.
Answer:
The thylakoid membranes of the chloroplast.
Explanation:
The thylakoids contain chlorophyll and the proteins necessary for the light-dependent reactions, including photosystems I and II, electron transport chain components, and ATP synthase. These structures are stacked into grana, maximizing surface area for light absorption.
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9. Mention the site of light-independent reaction?
Answer:
The stroma of the chloroplast.
Explanation:
The stroma is the fluid-filled space surrounding the thylakoids. It contains enzymes required for the Calvin cycle, where carbon dioxide is fixed into glucose using ATP and NADPH produced in the light-dependent reactions.
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✔ Summary Table for Quick Reference:
| Question | Answer |
|--------|--------|
| 1 | Process converting light energy into chemical energy using CO₂ and H₂O |
| 2 | 6CO₂ + 6H₂O + Light → C₆H₁₂O₆ + 6O₂ |
| 3 | Two stages: Light-dependent and Light-independent |
| 4 | Absorbs light energy for conversion into chemical energy |
| 5 | Soil (via roots) |
| 6 | Atmosphere (through stomata) |
| 7 | Blue and red wavelengths |
| 8 | Thylakoid membranes |
| 9 | Stroma |
Let me know if you'd like this formatted as a printable PDF or need diagrams!
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Photosynthesis Worksheet
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1. How would you define photosynthesis?
Answer:
Photosynthesis is a biological process by which green plants, algae, and some bacteria convert light energy (usually from the sun) into chemical energy stored in glucose. This process uses carbon dioxide (CO₂) from the air and water (H₂O) from the soil, in the presence of chlorophyll and sunlight, to produce glucose (C₆H₁₂O₆) and oxygen (O₂) as a byproduct.
Explanation:
Photosynthesis is essential for life on Earth because it produces oxygen and forms the base of the food chain by creating organic compounds that other organisms consume.
---
2. What is the photosynthesis equation?
Answer:
6CO₂ + 6H₂O + Light Energy → C₆H₁₂O₆ + 6O₂
Explanation:
This balanced chemical equation shows that six molecules of carbon dioxide and six molecules of water, using light energy, are converted into one molecule of glucose and six molecules of oxygen. The reaction occurs in the chloroplasts of plant cells.
---
3. How many stages of photosynthesis are there?
Answer:
There are two main stages of photosynthesis:
1. Light-dependent reactions
2. Light-independent reactions (Calvin cycle)
Explanation:
- The light-dependent reactions occur in the thylakoid membranes of the chloroplast and require light to produce ATP and NADPH.
- The light-independent reactions (Calvin cycle) take place in the stroma and use ATP and NADPH to fix carbon dioxide into glucose.
---
4. What is the role of chlorophyll in Photosynthesis?
Answer:
Chlorophyll is the green pigment found in chloroplasts that absorbs light energy (mainly red and blue wavelengths) and converts it into chemical energy during the light-dependent reactions.
Explanation:
Chlorophyll captures photons from sunlight and uses this energy to excite electrons, initiating the electron transport chain that leads to the production of ATP and NADPH. It reflects green light, which is why plants appear green.
---
5. During photosynthesis plants absorb water from?
Answer:
Plants absorb water from the soil through their roots.
Explanation:
Water is absorbed by root hairs via osmosis and transported upward through the xylem to the leaves, where it is used in the light-dependent reactions of photosynthesis.
---
6. During photosynthesis plants absorb carbon dioxide from?
Answer:
Plants absorb carbon dioxide from the atmosphere through tiny openings called stomata in the leaves.
Explanation:
Stomata open during the day to allow CO₂ to enter the leaf for use in the Calvin cycle. They also allow oxygen to exit and water vapor to escape during transpiration.
---
7. During photosynthesis which light wavelengths are absorbed by plants to carry out the process of photosynthesis?
Answer:
Plants primarily absorb blue light (around 430–450 nm) and red light (around 640–680 nm).
Explanation:
Chlorophyll a and b absorb these wavelengths most efficiently. Green light (around 500–570 nm) is reflected, which is why plants appear green. Other pigments like carotenoids absorb light in the blue-green and green regions, extending the range of usable light.
---
8. Mention the site of the light-dependent reaction.
Answer:
The thylakoid membranes of the chloroplast.
Explanation:
The thylakoids contain chlorophyll and the proteins necessary for the light-dependent reactions, including photosystems I and II, electron transport chain components, and ATP synthase. These structures are stacked into grana, maximizing surface area for light absorption.
---
9. Mention the site of light-independent reaction?
Answer:
The stroma of the chloroplast.
Explanation:
The stroma is the fluid-filled space surrounding the thylakoids. It contains enzymes required for the Calvin cycle, where carbon dioxide is fixed into glucose using ATP and NADPH produced in the light-dependent reactions.
---
✔ Summary Table for Quick Reference:
| Question | Answer |
|--------|--------|
| 1 | Process converting light energy into chemical energy using CO₂ and H₂O |
| 2 | 6CO₂ + 6H₂O + Light → C₆H₁₂O₆ + 6O₂ |
| 3 | Two stages: Light-dependent and Light-independent |
| 4 | Absorbs light energy for conversion into chemical energy |
| 5 | Soil (via roots) |
| 6 | Atmosphere (through stomata) |
| 7 | Blue and red wavelengths |
| 8 | Thylakoid membranes |
| 9 | Stroma |
Let me know if you'd like this formatted as a printable PDF or need diagrams!
Parent Tip: Review the logic above to help your child master the concept of photosynthesis equation worksheet.
