Page 218 - Biology_F5

Comparative studies of natural groups of organisms
4. Other safety laboratory rules and
precautions should be adhered to
under the supervision of a teacher or
laboratory technician.
FOR ONLINE READING ONLY
Activity 3.17: Dissection of a rat or
mouse to display the digestive and
urinogenital systems
Materials
Fresh male or female rat or mouse,
dissection kit, dissecting tray or dish,
chloroform, and cotton wool
Procedure
(a) Collect a live male or female rat or
mouse; put it in a container with lid
and anaesthetize it with chloroform
soaked in a small roll of cotton wool
for about five minutes.
(b) Dissect a mouse in the usual way, to
fully display the digestive system and
urinogenital system.
Questions
1. Draw well labelled diagrams of
the displayed systems in (b) above.
Compare your diagrams with those
of Figures 3.73, 3.74 and 3.75
respectively.
2. Explain the role(s) of each labelled
part.
3. How does the urethra of a female
rat or mouse differ from that of a
male?
4. Classify the organism to class level. 12. Describe the general and distinctive
Form Five Student’s Book
Revision exercise 3
1. With example(s) categorise viruses
based on the nature of their genomes
and morphology of their capsids.
2. In your community, there is a belief
among the people that the government
should eradicate all viruses because
they cause diseases. As a biologist,
educate the community on the
economic importance of viruses.
3. Classify bacteria on the basis of:
(a) Morphology
(b) Gram stain test
4. Explain how the characteristics
of Monera contribute to both
advantageous and disadvantageous
aspects of their existence.
5. How does Entamoeba histolytica
manage to live successfully in its
host?
6. Explain how Plasmodium is able to
exist in humans and mosquitoes.
7. Describe the features that are unique
to phylum Apicomplexa.
8. Euglena is an ancestor of plants and
animals. Explain.
9. How is Phytophthora adapted to
its mode of life?
10. Spirogyra resembles plants.
Explain.
11. Explain with examples the
advantages and disadvantages of
Protoctists.
features of basidiomycetes.
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