[Science SPM] Balance In Nature

Source: ADaP

NOTE:

PAPER 1

1. Which of the following processes will increase the percentage of oxygen in the atmosphere?
A. Burning
B. Respiration
C. Photosynthesis
D. Decomposition

2. Which of the following statement is correct?
I. Habitat is the natural place where an organism lives.
II. A population is a group of individuals of different species.
III. An ecosystem is a natural system consisting of living organism interacting with each other and with the non-living components to form a stable environment.

A. I and II
B. I and III
C. II and III
D. I, II and III

3. Which of the following are natural cycles found in the atmosphere?
I. Water cycle
II. Nitrogen cycle
III. Carbon cycle
IV. Carbohydrate cycle

A. I and II only
B. II and III only
C. I, II and III.
D. I, II, III and IV

4. The nitrogen cycle will maintain the percentage of nitrogen in atmosphere at
A. 0.04%
B. 16%
C. 21%
D. 78%

5. The high percentage of carbon dioxide in the atmosphere will cause
I. global warming.
II. the decrease in the Earth's temperature.
III. the change in the Earth's temperature.

A. I and II
B. I and III
C. II and III
D. I, II, and III

6. Denitrifying bacteria converts
A. nitrates to nitrogen.
B. nitrites to nitrates.
C. nitrogen to nitrates.
D. nitrates to ammonium compound.

7. The source of energy for all food chains comes from the
A. producer.
B. sunlight.
C. primary consumer.
D. secondary consumer.

8. Eutrophication is caused by
A. disposal of rubbish into the sea.
B. the disposal of hot water into the sea.
C. the flow of sewage into the rivers and the sea.
D. the flow of chemical fertilisers into the ponds and rivers.

9. What is the function of ozone layer?
A. To maintain the earth's temperature.
B. To increase the percentage of oxygen in the atmosphere.
C. To filter the ultra violet rays from the sun.
D. To trap the heat from the sun.

10. All of the following are the effects of uncontrolled logging except
A. the decrease in air temperature.
B. soil erosion and flash floods.
C. destruction of habitats.
D. extinction of species.

11. Which of the following organisms is used in biotechnological methods to process factory wastes such as palm oil bunch to methane gas?
A. Virus
B. Fungi
C. Bacteria
D. Protozoa

12. Which of the following pollution is associated with motor vehicles and engines?
I. Noise pollution
II. Air pollution
III. Thermal pollution

A. I and II
B. I and III
C. II and III
D. I, II and III

13. Waste products from agricultural activities that can pollute the environment include
I. animal faeces
II. chemical fertilisers
III. pesticides

A. I and II
B. I and III
C. II and III
D. I, II and III

14. The following gases can form acid rain except
A. nitrogen oxide
B. hydrogen oxide
C. sulphur dioxide
D. carbon monoxide

PAPER 2

1. Figure 1 shows the water cycle that occurs in nature.

FIGURE 1

(a) Name processes P, Q, R and S.
P : Evaporation
Q : Respiration
R : Transpiration
S : Burning

(b)

(i) What is phenomenon X?

• Rain

(ii) Name 2 processes that are involved in the formation of X.

1. evaporation
2. condensation