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Questions and Answers
What is the key difference between gaseous exchange during photosynthesis and respiration in plants?
What is the key difference between gaseous exchange during photosynthesis and respiration in plants?
Where does the process of gaseous exchange mainly take place in plants?
Where does the process of gaseous exchange mainly take place in plants?
What happens to the gases exchanged during photosynthesis and respiration in plants?
What happens to the gases exchanged during photosynthesis and respiration in plants?
What causes the opening and closing of stomata?
What causes the opening and closing of stomata?
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What type of respiration involves taking in of oxygen and giving out of carbon dioxide in plants?
What type of respiration involves taking in of oxygen and giving out of carbon dioxide in plants?
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Which type of cells form the slit-like openings of stomata?
Which type of cells form the slit-like openings of stomata?
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What is the main function of stomata in plants?
What is the main function of stomata in plants?
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What causes the decrease in turgidity of the guard cells, leading to the closure of stomata?
What causes the decrease in turgidity of the guard cells, leading to the closure of stomata?
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Which factor primarily determines the opening and closing of stomata?
Which factor primarily determines the opening and closing of stomata?
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What is the role of guard cells in gaseous exchange in plants?
What is the role of guard cells in gaseous exchange in plants?
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What is the purpose of using Hydrogen bicarbonate as an indicator in this practical activity?
What is the purpose of using Hydrogen bicarbonate as an indicator in this practical activity?
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Why is test tube 2 wrapped with aluminum foil or black paper in this practical activity?
Why is test tube 2 wrapped with aluminum foil or black paper in this practical activity?
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What can be inferred when the Hydrogen bicarbonate indicator in test tube 4 turns magenta?
What can be inferred when the Hydrogen bicarbonate indicator in test tube 4 turns magenta?
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What effect does sealing the test tubes with wax have on the practical activity?
What effect does sealing the test tubes with wax have on the practical activity?
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What is the purpose of hanging leaves in test tubes 1, 2, and 4 in this practical activity?
What is the purpose of hanging leaves in test tubes 1, 2, and 4 in this practical activity?
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What is the significance of using fresh green leaves in this practical activity?
What is the significance of using fresh green leaves in this practical activity?
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Study Notes
Gaseous Exchange in Plants
- Photosynthesis involves the uptake of carbon dioxide and the release of oxygen, while respiration involves the uptake of oxygen and the release of carbon dioxide.
- Gaseous exchange mainly takes place through stomata, small openings on the surface of leaves.
Gas Functions
- During photosynthesis, oxygen produced is released into the atmosphere, whereas carbon dioxide absorbed is utilized in the process.
- In respiration, oxygen is consumed for energy production, releasing carbon dioxide as a waste product.
Stomata Opening and Closing
- Stomata are primarily formed by guard cells, which control their opening and closing.
- The closing of stomata occurs due to a decrease in turgidity of the guard cells, often influenced by water loss or low humidity.
- Environmental factors such as light intensity, carbon dioxide concentration, and water availability primarily determine the opening and closing of stomata.
Role of Guard Cells
- Guard cells regulate gaseous exchange by altering the size of the stomatal pore, thus controlling water loss and gas exchange efficiency.
Practical Activity Insights
- Hydrogen bicarbonate serves as an indicator to show the presence of carbon dioxide; a color change indicates changes in gas concentration.
- Test tube 2 is wrapped in aluminum foil or black paper to block light, preventing photosynthesis and allowing observation of respiration only.
- A magenta color change in the Hydrogen bicarbonate indicator in test tube 4 signifies high levels of carbon dioxide, indicating active respiration.
- Sealing test tubes with wax restricts gas exchange, simulating conditions that allow observation of internal gas levels.
- Hanging leaves in test tubes 1, 2, and 4 allows observation of gas exchange without interference from external factors.
- Fresh green leaves are used to ensure active photosynthesis and respiration processes, providing accurate experimental results.
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Description
This quiz covers the process of gaseous exchange in plants, including the exchange of oxygen and carbon dioxide for respiration and photosynthesis. It also includes the methods of gaseous exchange in both aquatic and terrestrial plants.
