Page 27 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

FOR ONLINE READING ONLY

(a) (b)
Figure 2.21: Using sense organs to make observation (a) seeing and touching
(b) tasting

We have five sense organs. These are Procedure
eyes, ears, skin, nose, and tongue. 1. Carefully observe the specimens
The observation process with the help provided using your sense
of sense organs enables you to study organs.
living organisms. For instance, if you
have a coconut, you can use your sense Safety precautions
organs to determine that: Do not taste anything in the
(a) It is round by seeing, laboratory. They may be
(b) It contains a liquid by hearing the contaminated with poisonous
sound when shaken, materials or they may be
(c) It has a rough husk by touching, poisonous themselves.
(d) It has a good smell by smelling
(after breaking the coconut), and 2. Note down the features of each
(e) It has a sweet taste by tasting (after specimen you have observed.
breaking the coconut). 3. Draw a table similar to Table 2.2

in your exercise book. Record
Activity 2.2: Making observations
using sense organs the observations by putting a tick
(√) on each object.
Materials: Colourful pictures,
insects, preserved specimens, flowers,
perfume, whistle, bell, stones, wooden
objects, pieces of cloth, ice, hot water,
and lukewarm water

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