Page 25 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

11. Observe the specimen again
under low power and medium
power objective lenses.

12. What did you observe?
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Biological models
Biological models are sculptures that
represent a particular organ or system
of an organism. They are usually made
in three dimensions, hence representing
the real part of an organism. Models
are used during teaching and learning
process to reinforce concepts. Examples
of models that are commonly used in
teaching and learning Biology, include
models of the human eye, lungs, heart,
ear, and skeleton. Most of the models
used in Biology are made up of plastic
materials. Examples of biological
models are shown in Figures 2.17 (a)
and (b).

(b)

Figure 2.17: Models of (a) the human
ear (b) the human skeleton

Preserved specimens
Preserved specimens are collected
organisms or parts of organisms that
are preserved for learning purposes.
Organisms or parts of organisms that
are usually preserved include plant
(a)
leaves, roots, fruits as well as insects,
and other small animals. Figure
2.18 shows examples of preserved
specimens.

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