1.1. Describe in the correct sequence the variouIS steps that were followed during a starch (6) test. 1.2. Mention one safety precaution that should be taken during this experiment. (1) 1.3. Draw a labelled diagram of the leaf showing the results of the investigation. (5) (2) .4. Provide a conclusion for the experiment.
1.1. Describe in the correct sequence the variouIS steps that were followed during a starch (6) test. 1.2. Mention one safety precaution that should be taken during this experiment. (1) 1.3. Draw a labelled diagram of the leaf showing the results of the investigation. (5) (2) .4. Provide a conclusion for the experiment.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:### Starch Test Experiment
#### Experiment Steps (6 Marks)
1. **Pluck a Healthy Leaf**: Select a green, healthy leaf to be used for the experiment.
2. **Boil the Leaf**: Boil the leaf in water for a few minutes to break down cell walls.
3. **Submerge in Alcohol**: Immerse the boiled leaf in alcohol to remove chlorophyll.
4. **Re-boil Leaf**: Boil the leaf again in water to soften it.
5. **Treat with Iodine Solution**: Place the leaf in a petri dish and cover it with iodine solution.
6. **Observe Color Change**: Note the color change, which indicates the presence of starch.
#### Safety Precaution (1 Mark)
- **Handling Chemicals Carefully**: Wear gloves and safety goggles to protect yourself from hot water and alcohol.
#### Diagram Requirement (5 Marks)
- **Labelled Diagram**: Draw a clear, labeled diagram of the leaf, highlighting the areas that turn blue-black upon undergoing the test.
#### Conclusion (2 Marks)
- **Conclusion**: If the leaf turns blue-black, starch is present, indicating that photosynthesis has taken place within the leaf area tested.
#### Additional Diagram Description
- The image shows two leaves. The first leaf is depicted as a whole. The second leaf is partially covered with a strip, indicating the section being subjected to the starch test.
This page is structured to guide students through conducting a starch test on a leaf efficiently and safely.
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