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Cell BiologyRequired Practical

Required Practical: Using a Light Microscope

Part of Microscopy · GCSE GCSE Biology revision

This required practical covers Required Practical: Using a Light Microscope within Microscopy for GCSE Biology. Light and electron microscopes, magnification and resolution calculations, specimen preparation, staining techniques, and practical microscopy skills It is section 8 of 20 in this topic. Revise both the method and the reason for each step, because practical questions often test understanding rather than pure recall.

Topic position

Section 8 of 20

Practice

26 questions

Recall

20 flashcards

🧪 Required Practical: Using a Light Microscope

Aim:

To use a light microscope to observe, draw and label a selection of plant and animal cells

Equipment:

  • Light microscope
  • Microscope slides and coverslips
  • Specimens: onion epidermis, cheek cells
  • Stains: iodine solution, methylene blue
  • Dropping pipette
  • Filter paper or paper towel
  • Mounted needle
  • Ruler

Method:

  1. Set up microscope: Start with lowest magnification (×4 or ×10 objective)
  2. Prepare specimen: Place thin section on slide
  3. Add stain: Add 1-2 drops of appropriate stain
  4. Add coverslip: Lower at 45° angle to avoid air bubbles
  5. Place on stage: Secure with clips
  6. Focus on low power: Use coarse focus knob
  7. Center specimen: Move slide to find interesting area
  8. Switch to high power: Rotate to higher magnification
  9. Fine focus only: Use fine focus knob for sharp image
  10. Observe and record: Draw what you see with labels

⚠️ Safety Considerations:

  • Handle slides and coverslips carefully - sharp edges
  • Never force focus knobs
  • Clean lenses with lens paper only
  • Wash hands after handling stains

Keep building this topic

Read this section alongside the surrounding pages in Microscopy. That gives you the full topic sequence instead of a single isolated revision point.

Units of MeasurementPreparing Microscope SlidesThe World Invisible to the Naked EyeLight Microscope — Parts and Function

Practice Questions for Microscopy

What is magnification?

  • A. The ability to distinguish between two separate points
  • B. How many times larger an image appears compared to the actual object
  • C. The brightness of an image under a microscope
  • D. The wavelength of light used in microscopy
1 markfoundation

Explain why specimens are stained before viewing under a light microscope.

3 marksstandard

Quick Recall Flashcards

What is magnification?
Magnification is how many times larger an image appears compared to the actual object. It tells us how much bigger something looks through a microscope.
What is resolution?
Resolution is the ability to distinguish between two separate points that are close together. It determines how clear and detailed an image is.

26 questions on Microscopy — practise free

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