Environmental Sustainability

What is reduced by deforestation?

• Soil erosion

• Carbon dioxide

• Landslides

• Rainfall

How does eutrophication lead to the death of aquatic organisms?

• Algae not releasing enough oxygen for respiration of aquatic organisms

• Algae respiring instead of photosynthesizing

• Toxic waste produce by algal boom poisoning aquatic organisms

• Decomposition of dead plants and algae by decomposer bacteria used up oxygen in the water

Which of the following contributes to global warming?

(Two correct answers)

• Increased deforestation

• Increased reforestation

• Decreased fossil fuel combustion

• Increased fossil fuel combustion

Which of the following are the greenhouse gases?

(Two correct answers)

• Nitrogen

• Methane

• Carbon monoxide

• Nitrogen oxide

Farah carried out a field study in a pond near her father's oil palm plantation. She found that the surface of the pond is covered with algae. What could be the possible reason?

• Disposal of oil palm fronds into the pond

• Hot weather reduces the water level in the pond

• Disposal of sewage from nearby settlements

• Excess use of nitrate and phosphate fertilisers in the oil palm plantations

A group of students carried out an experiment to determine the level of pollution in rivers Q and R. The result of the experiment is shown in the table attached. Which statement is true according to the table shown?

• River Q has the most organic substance

• River R has the least organic substance

• River Q has a greater number of bacteria

• River R is the most polluted

What is the phenomenon S?

• Green house effect

• Air pollution

• Thermal pollution

• Eutrophication

Which of the following are the effects of these activities on the river ecosystem?

(Two correct answers)

• Increase the biochemical oxygen demand

• Disrupts the food chain of aquatic organisms

• Maintains the photosynthesis of aquatic plants

• Surrounding temperature increased