Intervensi biology Form 4 chapter 9

1. INTERVENTON – BIOLOGY CHAPTER 9
CHAPTER 9 : ENDANGERED ECOSYSTEM
1. The inhalation of carbon monoxide into human body is dangerous because carbon monoxide
A competes with oxygen to combine with haemoglobin in the red blood cells.
B combines with haemoglobin to form carbaminohaemoglobin.
C prevents the formation of red blood cells in the bone marrow.
D destroys the alveolus membrane.
2. If all members of a species disappear from Earth, that species is
A extinct. C Endangered.
B non-renewable. D threatened.
3. Improper deforestation can lead to
l erosion ll silting of rivers lll soil becomes less fertile lV floods
A I, II and III only C II, III and IV only
B I, III and IV only D I, II, III and IV
4. The figure shows a human activity.
Which of the following are the effects of the activity?
1 Flash floods 111 Global warming
11 Landslide 1V Thinning of the ozone layer
A 1,11 and 111 only C 11,111 and 1V only
B 1,11 and 1V only D 1,11,111 and 1V
5. Which gas is thought to be the cause of global warming?
A Radon C Carbon dioxide
B Ozone D Carbon monoxide

2. 1. Pollution
(a) Pollution involves the …………………….. of harmful substances in the earth’s environment.
(b) These substances are called …………………..
2. Air pollution
(a) Almost all air pollution is a result of …………………… of …………………. at homes,
industries or from vehicles.
(b) Complete the table below.
Types of pollution Source/Derivative Effects on man Effects on environment
Smoke Reduce light intensity.
Reduce photosynthesis.
Burning of fossil
fuels containing
sulphur
Irritates eyes.
Damages lungs.
Oxides of nitrogen
Power stations Photochemical smog
Burning of fossil
fuels (incomplete
combustion)
_
Carbon dioxide Heat associated problems
Car exhausts Brain damage
_
CFC Cooling agent in
refrigerators and air
conditioning
Reduce plant yields
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3. (a) (i) Name a pollutant found in the smoke during burning.
……………………………………………………………………………………………
(ii) X is a phenomenon caused by air pollution. What is X?
………………………………………………………………………….………………..
(iii) Explain how X occurs?
………………………………………………………………………………………………..
………………………………………………………………………………………………..
…………………………………………………………………………………………..…
(b) (i) Build a food chain that may be found in this industrial area.
……………………………………………………………………………………...…
(ii) What is the effect of pollution on the food chain?
..…………………………………………………………………………………….…
( c) Penomenon X will affect the abiotic factor of a lake in this industrial district..
Name an abiotic factor and the effect of X on it,
…………………………………………………………………………………………..
………………………………………………………………………..…………………
Explain how a spell of dry season has on the respiratory organ of the residents in this industrial
area.
……………………………………………………………………………………………..
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4. …………………………………………………………………………………………….
……………………………………………………………………………………………
Figure 5 shows the location of ozone layer at stratosphere, at about 20 – 50 km from the earth
surface.
Figure 5
a. i. What is ozone layer? (1m)
__________________________________________________________
ii. State the function of ozone layer. (1m)
__________________________________________________________
b. The thinning of ozone layer has been recorded by scientists since the 1970s.
i. State the main cause of ozone depletion.(1m)
___________________________________________________
ii. How does the cause that you stated in (b) i deplete the ozone layer. (3m)
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
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UV rays
Ozone layer
Stratosphere
Troposphere
Earth

5. ____________________________________________________
c. State two effects of ozone depletion. (2m)
__________________________________________________________
__________________________________________________________
__________________________________________________________
d. Explain two steps to reduce ozone depletion. (2m)
__________________________________________________________
__________________________________________________________
__________________________________________________________
QUESTION 3
Figure 3 shows the situation at Y site that is developing.
Figure 3
a. Explain the purpose of development.(2m)
_______________________________________________________________
_______________________________________________________________
b. State the effects of following to our ecosystem (3m)
ii. Factories: _________________________________________________
iii. Vehicles: __________________________________________________
iv. Deforestation: ______________________________________________
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6. c. Predict the effect to ecosystem if there is no proper management of development activities.
(2m)
________________________________________________________________
_______________________________________________________________
d. If you are the city planner, describe one way how you can develop certain places very well
and at the same time sustain the quality of environment. (2m)
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
e. Explain two steps that can be taken by ourselves to preserve our environment based on the
activities in Figure 3. (2m)
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
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7. c. Predict the effect to ecosystem if there is no proper management of development activities.
(2m)
________________________________________________________________
_______________________________________________________________
d. If you are the city planner, describe one way how you can develop certain places very well
and at the same time sustain the quality of environment. (2m)
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
e. Explain two steps that can be taken by ourselves to preserve our environment based on the
activities in Figure 3. (2m)
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
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