Practical Skills(WJEC)

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12 Terms

1
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Iodine Solution

Used to stain plant cells (onion cells) for better visualization of cell structures.

2
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Methylene Blue Solution

Utilized to stain animal cells (cheek cells) to enhance the visibility of cell structures.

3
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Cover Slip Technique

Essential to prevent air bubbles that can obstruct the view of cells under the microscope.

4
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Objective Lenses

Begin with low power (10X) for general observation, then switch to high power (40X) for detailed examination.

5
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Labeled Drawings

Include all visible cell structures like cytoplasm, cell membrane, nucleus, and cell wall in the diagrams.

6
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Energy Content of Food

Measure the energy content by heating and recording the water temperature change.

7
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Controlled Variables

Maintain consistent water volume and fixed tilting angle for accurate results.

8
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Sources of Error

Heat loss and incomplete combustion can affect the precision of energy content measurements.

9
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Enzymes

Investigate the effect of temperature on enzyme activity using amylase and starch solutions.

10
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Rate Calculation

Calculate the rate of enzyme reaction as 1 divided by the time taken for the iodine to remain brown.

11
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Photosynthesis

Study the impact of light on photosynthesis by measuring oxygen bubble production in pondweed.

12
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Transpiration

Explore factors affecting transpiration rates in plants using a potometer and varying environmental conditions.