Page 70 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Chapter Five

Viruses and major gr
Viruses and major groups oups
FOR ONLINE READING ONLY
of living things
of living things

Introduction

There are many species of living organisms in the world. These organisms are
placed in groups based on their common or shared characteristics. Each group
has its own features that make it distinct from others. In this chapter, you will
learn about viruses and five kingdoms of organisms, namely, Monera, Protoctista,

Fungi, Plantae and Animalia. The competencies developed will enable you to
distinguish members of these groups, understand their interrelationships and
explore their importance to human beings and other organisms.

cell. A virus is not a cell. Examples of
viruses are shown in Figure 5.1
Think
A world without the knowledge of
classification

Viruses (a)

Task 5.1
From the library and reliable internet
sources, search for information about
the characteristics, advantages and (c)
disadvantages of viruses.
(b)

A virus is an extremely small fragment of Figure 5.1: Different types of viruses (a)
nucleic acid (DNA or RNA) surrounded Tobacco mosaic virus (b) Bacteriophage
by a protein coat. It is smaller than a living virus (c) Influenza virus

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