This diagram covers Preparing Microscope Slides within Microscopy for GCSE Biology. Light and electron microscopes, magnification and resolution calculations, specimen preparation, staining techniques, and practical microscopy skills It is section 9 of 20 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

🧬 Preparing Microscope Slides

Wet Mount Preparation:

Clean slide: Wipe with alcohol or clean cloth
Add specimen: Place small amount in center
Add water/stain: Single drop of mounting medium
Position coverslip: Hold at 45° angle at one edge
Lower slowly: Gradually lower to exclude air bubbles
Remove excess: Blot with filter paper

Common Stains:

Iodine solution: Stains starch purple/black, cytoplasm yellow
Methylene blue: Stains nuclei dark blue
Congo red: Stains cell walls
Neutral red: Vital stain, shows living cells

Why stain? Most cells are transparent and colorless. Stains bind to specific structures, making them visible and easier to identify.

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 resolution?

Resolution is the ability to distinguish between two separate points that are close together. It determines how clear and detailed an image is.

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.

Preparing Microscope Slides