Course Work
Topic: VIRUSES
Name: MILELE JEWEL ABIA
Class: S.1 south
Subject: Biology
TASK 1
Give the characteristics of viruses.
TASK 2
Examples of animal and plant viral diseases.
TASK 3
How viruses are transmitted.
TASK 4
Prevention for viral diseases.
Answers to task one
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Viruses are microscopic organisms.
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Viruses consist of a central core of nucleic acid that is surrounded by o
coat of one or few proteins.
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Viruses are parasitic organisms. (Depend on other organisms.)
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Viruses are easily crystalized.
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Viruses do not have the common cellular structures.
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Viruses do not carry out metabolism.
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Viruses multiply only when in a living organism.
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Majority of them change shape and form quite often.
Answers to task two
Animal viral diseases include;

Influenza

Measles

Hepatitis B

Ebola

Poliomyelitis

HIV/AIDS

Covid-19

STDs
Plant viral diseases include;

Cassava mosaic

Potato blight

Cotton blight

Tomato blight
Answers to task three
Viruses are spread through different ways.
 For example, some viruses are transmitted through vectors like the
cassava mosaic which is spread by a vector known as the white fly.
 Other viruses are spread/transmitted through body fluids like blood
that can cause the HIV/AIDS virus and viruses that cause STDs.
 Viruses can also be spread through air and physical contact with an
infected person one example is the Corona Virus.
 Some viruses are transmitted through contaminated surfaces like
door handles, tables, chair handles, etc.
Answers to task four
 Since there are many ways through which viruses are transmitted, it also
implies that the prevention methods are different.
 For example, we can prevent cassava mosaic by using stem cuttings that
have not been attacked by the virus. By also the use of resistant varieties of
cassava plants.
 While for diseases like HIV/AIDS and STDs can be prevented by use of
condoms and going for antenatal checkups during pregnancy.
 Some diseases such as Ebola can be prevented by isolating infected people.
 By avoiding crowded places.
 By wearing face masks and cleaning surfaces regularly.
 By vaccinating against some viral diseases like Covid-19.