CHAPTER 38: Environmental Issues

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

Kyoto protocol was endorsed at

Rachel Carson’s famous book “Silent Spring” is related to

Which of the following are most suitable indicators of SO 2 pollution in the environment?

Euro II norms stipulate that sulphur be controlled at _______ ppm in diesel and _______ ppm in petrol.

Two lakes, A and B are identical in all aspects except that lake A has higher temperature. Which of the following is true ?

The two gases making the highest relative contribution to the greenhouse gases are

Which one of the following statements is not valid for aerosols?

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this:

1.Lots of urea and phosphate fertilizer were used in the crops in the vicinity

2.The area was sprayed with DDT by an aircraft

3.The lake water turned green and stinky

4.Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

Which two of the above were the main causes of fish mortality in the lake?

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels, this happens because

Which of the following statements about Eutrophication are TRUE ?

(i)It can be naturally occurring process.

(ii)It is commonly found in standing rather than running water.

(iii)It can lead to oxygen depletion.

(iv)It is commonly assoicated with high levels of phosphates and nitrates.

The polyblend is

To improve the quality of environment (air, water and soil) the Govt. of India passed the ‘Environment (Protection) Act’ in year