Chapter 36 test

Which of the following is not an impact of rapid population growth?

• depletion of natural resources

• increase in the demand for food

• increase in life expectancy

• environmental deterioration

Which of the following are non-renewable resources?

(1) aluminium

(2) timber

(3) coal

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

3. Soil erosion may be speeded up by

(1) deforestation.

(2) overgrazing.

(3) growing a single crop species for a number of years.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following are the harmful effects of reclamation on the environment?

(1) release of toxic heavy metals into the water

(2) destruction of habitats

(3) algal bloom

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following is not a possible cause of global warming?

• deforestation

• acid rain

• burning of fossil fuels

• rearing livestock

In industrial cities, many trees are killed due to serious air pollution. Which of the following air pollutants may be the major cause of death of these trees?

• methane

• carbon monoxide

• carbon dioxide

• sulphur dioxide

Which of the following conditions may lead to algal bloom?

(1) high concentration of nitrate in sewage

(2) high concentration of phosphate in sewage

(3) high concentration of dissolved oxygen in sewage

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Algal bloom may harm aquatic organisms by

(1) producing toxins.

(2) depleting the dissolved oxygen in the water.

(3) depleting the inorganic nutrients in the water.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Untreated sewage from a farm is discharged into a river. The graph below shows the concentrations of dissolved oxygen, ammonia, nitrate and the number of bacteria down the river.

Which curves represent the concentration of dissolved oxygen and number of bacteria in the river respectively?

• A

• B

• C

• D

Lichens are sensitive to sulphur dioxide. They grow poorly in the area with high concentrations of sulphur dioxide. Which of the following graphs represents the changes in the number of lichen species from the centre of an industrial city to a rural area 20 km away?

• A

• B

• C

• D