Page 84 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools
Characteristics of Trypanosoma sp.
(a) They are unicellular, slender,
elongated, and dorsal ventrally (b) Trypanosoma sp. also cause
flattened in shape.
(b) They are parasites in wild animals,
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domesticated animals, and human
beings.
(c) Have a mass of mitochondrial DNA Exercise 5.4
located near the mitochondrion in a
structure called kinetoplast.
(d) The body is covered with a thin,
elastic, and firm pellicle.
(e) Most of them reproduce asexually
by binary fission while inside the
host body.
(f) Some have an undulating membrane
for locomotion.
Advantages of Trypanosoma sp.
Trypanosoma brucei has been
extensively studied by scientists, as it
is a model organism for understanding
the biology of parasites and the diseases
they cause. Research on Trypanosoma 2. You are given a microscope and a
brucei has led to the development of
new drugs and treatments for sleeping
sickness and related diseases.
Disadvantages of Trypanosoma sp.
(a) Trypanosoma brucei is the
causative agent of the disease called
human African trypanosomiasis
or sleeping sickness. The disease
affects mostly African countries.
It can be transmitted through bites
of a vector called tsetse fly or
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Biology FORM 1 new.indd 78
through blood contact from an
infected individual.
animal trypanosomiasis or Nagana
to cattle, buffalos and other large
herbivores.
1. Imagine you are on the field trip to a
stagnant water body for your Biology
class. Your teacher asks you to collect
water samples for microscopic
investigation from two different
locations in the pond, one near the
surface and the other from the bottom.
During microscopic examinations you
observed presence of Euglena sp. from
the surface sample and Paramecium sp.
from the bottom sample. Describe the
characteristics of the micro-organisms
observed from the samples.
slide with a sample of Trypanosoma
sp. to observe in your Biology class.
While looking at the slide under the
microscope, your teacher asks you
to describe the key characteristics of
Trypanosoma sp. that you can observe.
What features would you look for
to explain the characteristics of the
sample?
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