Chapter 10 Environmental Sustainability

What are the effect of global warming on the environment caused by widespread logging?

• I and II

• I and III

• II and IV

• III and IV

An electric power station uses nearby river water as a cooling agent. The used water then flowed into the river. What was the effect of the activity on the river ecosystem?

• Increase in the number of fish species

• Decrease in the river water BOD value

• Increase in the river water temperature

• Acidity of river water increases

Excess fertilisers and animal excretions flowed into a lake near an agricultural estate. Why did the dissolved oxygen concentration in the pond decreases?

• Increase in the number of fishes

• Less oxygen was absorbed by air

• Rapid increase in growth of decomposing bacteria

• Increase in the number of snails

Lichen was sensitive to air pollution. Therefore, their growth is often used as indicator for an air pollution. Diagram below shows a graph on the relationship between the number of lichen colonies against the distance from a town centre.

What is the conclusion of the study based on the above graph?

• The further from the town centre, the number of lichen colonies decreases

• The further from the town centre, the number of lichen colonies increases

• Many types of lichens grow near the town centre

• There is only one type of lichen that grows far from the town centre.

Diagram below shows an environmental phenomenon.

What cause the above phenomenon?

I Burning of fossil fuels

II Cutting down of forest

III Excessive use of fertilisers

IV Inappropriate treatment of sewage

• I and II

• I and III

• II and IV

• III and IV

Diagram below shows a human activity. What is the long-term effect on human health?

• Bronchitis

• Skin cancer

• Cataract

• Itchy skin

Diagram below shows concentration of dissolved oxygen at different locations along a river. Among the locations A, B, C and D, Which location has highest biochemical oxygen demand (BOD) value?

• A

• B

• C

• D

The statement below explains an experimental observation to test the pollution level of a water sample. What was the conclusion of the experiment?

• Water was not polluted because the oxygen content was high

• Water was not not polluted because there were a few bacteria

• Water was very polluted because there was a little oxygen content

• Water was very polluted because there was a lot of nutrients

Which are the green technology approaches?

I usage of fossil fuels

II usage of compost fertilisers

III usage of agrochemical materials

IV usage of hybrid cars

• I and II

• I and III

• II and IV

• III and IV

Which activity can contribute to ecosystem sustainability?

• use leaded petrol

• use plastic bags

• use styrofoam food container

• use energy saving lamps