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Questions and Answers
What is the purpose of using potassium hydroxide in the experiment?
What is the purpose of using potassium hydroxide in the experiment?
To absorb carbon dioxide
Why is it important to seal the bell-jars with vaseline?
Why is it important to seal the bell-jars with vaseline?
To make the setup air-tight
What is the role of roots in terrestrial plants?
What is the role of roots in terrestrial plants?
To take up water and other materials from the soil
What is the significance of starch in plants?
What is the significance of starch in plants?
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Why is nitrogen essential for autotrophs?
Why is nitrogen essential for autotrophs?
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What is the purpose of the experiment in Activity 6.2?
What is the purpose of the experiment in Activity 6.2?
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Why are bell-jars used in the experiment?
Why are bell-jars used in the experiment?
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What is the role of sunlight in photosynthesis?
What is the role of sunlight in photosynthesis?
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What is the function of the watch-glass containing potassium hydroxide?
What is the function of the watch-glass containing potassium hydroxide?
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What can be concluded from the experiment in Activity 6.2?
What can be concluded from the experiment in Activity 6.2?
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Study Notes
Nutrition in Multi-Cellular Organisms
- In multi-cellular organisms, specialized tissues are developed for excretion, requiring a transportation system to transport waste away from cells to the excretory tissue.
- Energy and materials from outside are necessary for growth, development, synthesizing protein, and other substances needed in the body.
Autotrophic Nutrition
- Autotrophs, such as green plants and some bacteria, use simple food materials obtained from inorganic sources, like carbon dioxide and water, to fulfill their energy and material requirements.
- Photosynthesis is the process by which autotrophs convert substances from the outside into stored forms of energy.
- Carbon dioxide and water are converted into carbohydrates in the presence of sunlight and chlorophyll, which provide energy to the plant.
Process of Photosynthesis
- Light energy is absorbed by chlorophyll.
- Light energy is converted into chemical energy, and water molecules are split into hydrogen and oxygen.
- Carbon dioxide is reduced to carbohydrates.
- These steps can occur separately, and the plant may prepare an intermediate product at night, which is acted upon by the energy absorbed during the day.
Role of Chlorophyll
- Chlorophyll is essential for photosynthesis.
- Chloroplasts, which contain chlorophyll, are cell organelles found in green dots in leaf cells.
Importance of Stomata
- Stomata are tiny pores present on the surface of leaves, allowing for massive gaseous exchange during photosynthesis.
- Stomata are also present on stems, roots, and leaves.
- Guard cells control the opening and closing of stomata, and they swell when water flows into them, causing the stomatal pore to open.
Experiment to Demonstrate Photosynthesis
- Activity 6.1 demonstrates the importance of chlorophyll in photosynthesis.
- Activity 6.2 shows the effect of carbon dioxide on photosynthesis.
- These activities can be used to design an experiment to demonstrate the importance of sunlight for photosynthesis.
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Description
This experiment explores the effect of carbon dioxide on plant growth. Students will observe how potassium hydroxide absorbs carbon dioxide and its impact on plant development.
