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In this section, you will learn how draw biological drawings of specimens observed using the microscope.
Biological drawings are used to visually illustrate the structure and details of biological specimens. Key requirements of drawing include:
Structure: Draw all visible structures that you observe.
For PLAN drawing - include the outline of all tissues/layers.
For DETAILED drawing - include all cells and visible internal structures.
Shape: Draw accurately the shape of what you observe.
Proportion: Draw accurately the relative proportion of structures/layers that you observe.
Line: Draw lines which are clear, sharp and continuous.
Below, we shall learn how to:
Use the eyepiece graticule to make proportional drawings
Draw (a) PLAN drawing and (b) DETAILED drawing for plants
Draw (a) PLAN drawing and (b) DETAILED drawing for animals
1. Use the eyepiece graticule to make proportional drawings
Step 1:
Use the low power objective lens to identify the tissues / region of interest. Depending on what you're looking at, you may also need to use the high power objective lens to examine the specimen.
Step 2:
Align and rotate the eyepiece graticule to the desired orientation.
Step 3:
Record the number of divisions occupied by each tissue layer. Accuracy is important.
Step 4:
Ensure that the proportion of tissues in your plan drawing accurately reflect what you observe.
2. PLAN and DETAILED drawings
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