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Questions and Answers
What color change indicates the presence of starch in a leaf during the experiment described?
What color change indicates the presence of starch in a leaf during the experiment described?
- Blue-black (correct)
- Green
- Yellow
- Red
According to the text, what did Von Helmont initially find essential for the increase in plant mass?
According to the text, what did Von Helmont initially find essential for the increase in plant mass?
- Sunlight
- Water (correct)
- Carbon dioxide
- Oxygen
What did scientists opine about the materials involved in the process of photosynthesis?
What did scientists opine about the materials involved in the process of photosynthesis?
- Only a few materials are still unknown
- All materials are known and understood
- The process involves a complex array of materials
- Several materials involved are still unknown (correct)
What did the process of boiling the leaf in water and then transferring it into methylated spirit aim to achieve?
What did the process of boiling the leaf in water and then transferring it into methylated spirit aim to achieve?
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What color change would indicate the presence of chlorophyll in the leaf during the experiment?
What color change would indicate the presence of chlorophyll in the leaf during the experiment?
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Study Notes
Starch Presence in Leaves
- A color change to blue-black indicates the presence of starch in a leaf during the experiment.
Von Helmont's Findings
- Von Helmont initially believed that water was essential for the increase in plant mass, conducting experiments to validate this idea.
Photosynthesis Materials
- Scientists generally think that carbon dioxide and water are the key materials involved in the process of photosynthesis, along with light energy.
Boiling Leaf Process
- The steps of boiling the leaf in water and then transferring it to methylated spirit aim to kill the leaf and remove chlorophyll, respectively, to prepare it for starch testing.
Chlorophyll Presence Indication
- A yellow or orange color change in the leaf during the experiment would suggest the presence of chlorophyll.
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