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The
final question
Marjorie
Henry, Contributor
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10.
(a) Table 4 presents the percentage
of carbon monoxide emission
by various sources in a particular
area.
TABLE
4: PERCENTAGE CARBON MONOXIDE
EMISSION
|
Source
|
Emission
(%)
|
| Fuel
Consumption |
4.3
|
| Industrial
processes |
8.1
|
| Transportation |
80.6
|
| Other |
7.0
|
Draw
a pie chart to illustrate the
carbon monoxide emission by
the source shown in Table 4.
(4 marks)
(b) (i) Define EACH of the
terms below
a) Greenhouse effect (2
marks)
b) Global Warming (2 marks)
(ii) State FOUR effects
of global warming on the environment.
(4 marks)
(c) (i) Suggest THREE ways
in which the tourist industry
may contribute to coral reef
destruction. (3 marks)
(ii) Explain how the destruction
of coral reefs can have negative
impacts on an area. Include
THREE impacts in your response.
(6 marks)
(d) Explain how deforestation
contributes to global warming.
(3 marks)
Total
24 marks
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Question
10, the last on the June 2007 examination
paper, is based on the following specific
objectives:
8.
describe the long-term changes in
global temperatures.
9.
explain the causes and consequences
of global warming, coral reef destruction
and deforestation.
10.
Explain the measures used to reduce
the emission of greenhouse gases,
coral reef degradation and deforestation.
Here
is the entire question.
The
skill tested in section (a) of this
question is constructing the pie chart.
Let me take some time to remind you
or maybe inform you about pie charts
and how they are constructed.
The
pie chart (also called pie graph and
divided circle)) is a diagram consisting
of a circle with subdivisions which
are proportional to the values they
represent.
The
subdivisions of the circle may be
shaded or coloured and suitably labelled.
The area of the whole circle is proportional
to the total number of cases represented.
Because of this fact, some amount
of calculation is needed in order
to construct the pie chart.
The
circle is 360 degrees and, therefore,
represents 100 per cent. In reference
to the data in the table, the percentage
of each source of carbon monoxide
emission is given. You will now have
to calculate the degrees for each
source by dividing the percentage
amount by 100 then multiplying by
360. Round off the figures to the
nearest whole number. For example,
industrial processes are 8.1 per cent
hence, 8.1I100x360 = 29.16 = 29º.
Here
are the degrees for the different
sources:
Fuel con'n - 4.3% =16º
Ind'l
processes - 8.1% = 29º
Trans'n
- 80.6% = 290º
Other
- 7.0% = 25º
Draw
a circle of reasonable size, about
6cm in diameter. Use your protractor
and a sharp pointed pencil to mark
off on that circle, the varying percentages
for each source.
Smallest
Begin
with the smallest amount, working
in an anti-clockwise direction from
a position that would represent 12
o'clock on the face of a clock. The
smaller percentages should be placed
within the slot that would represent
9 o'clock, starting with the smallest
and increasing anti-clockwise. However,
when there is a category called 'other',
this is indicated last in the circle,
regardless of its value. With this
in mind, the order then of representing
the percentage of emissions from the
different sources would be as listed
above.
Now
that you have the information for
the pie chart, construct it as an
assignment before the next lesson.
Remember now, the subdivisions must
be shaded and the diagram labelled
to indicate the different sectors.
The labelling can be done within the
sectors or outside of the circle.
A key can be used as well and this
may even result in a neater presentation.
PRINT when labelling rather than writing
in cursive.
The
discussion on the remainder of the
question continues in the next lesson.
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High
school students participate
in a CXC symposium on mathematics
at Bridgeport High School on
April 12.
-
Anthony Minott/ Freelance Photographer
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Marjorie
Henry is an independent contributor.
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