Page 98 - Biology_F5

Principles of classification

Task 2.7
Explore the school environment to observe various organisms. Choose four of these
organisms, examine their characteristics, and construct a bracketed dichotomous
key for them.

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Revision exercise 2
1. Explain any four drawbacks of natural system of classification.

2. Elucidate the advantages of artificial system of classification.

3. With examples, explain why it is important to classify organisms.

4. Explain the significance of taxonomic hierarchy in classification.
5. With examples, explain scientific and technological advantages paralleled with
the taxonomic shift from artificial to natural system of classification.

6. Explain the challenges associated with assigning scientific name to a newly
discovered organisms.

7. Why is scientific naming of organisms important?

8. Citing one example in each case, outline the rules governing binomial
nomenclature.
9. You are provided with fresh specimen or images as shown in Figure 2.3 of (a)
Phaseolus vulgaris (bean), (b) Solanum tuberosum (irish potato), (c) Solanum
incanum (bitter ball), (d) Solanum lycopersicum (tomato) and (e) Solanum
aethiopicum (bitter tomato) with flowers.
(i) Examine the characteristics of each plant species including the stem texture,
leaf blade size, leaf blade margin, flower colour, size of calyx, and size of
corolla.

(ii) Construct bracketed and indented keys for identification of the provided plant
specimens.

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