The UN Conference of Parties on climate change in the year 2011 was held in 

(1) Poland

(2) South Africa

(3) Peru

(4) Qatar

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

1. They are harmful to human health
2. They alter rainfall and monsoon patterns
3. They cause increased agricultural productivity
4. They have negative impact on agricultural land

Biochemical Oxygen Demand (BOD) may not be a good index for pollution in water bodies receiving effluents from

(1) domestic service

(2) dairy industry

(3) petroleum industry

(4) sugar industry

A lake which is rich in organic waste may result in
(1) increased population of aquatic organisms due to minerals

(2) drying of the lake due to algal bloom

(3) increased population of fish due to lots of nutrients

(4) mortality of fish due to lack of oxygen

The highest DDT concentration in aquatic food chain shall occur in 
(1) phytoplankton

(2) seagull

(3) crab

(4) eel

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers
(1) ozone

(2) ammonia 

(3) methane

(4) nitrous oxide

Joint Forest Management Concept was introduced in India during
(1) 1970s

(2) 1980s

(3) 1990s

(4) 1960s

The UN conference of Parties on climate change in the year 2012 was held at

1. Durban             

2. Doha

3. Lima                 

4. Warsaw

Increase in concentration of the toxicant at successive tropic levels is known as

1. biomagnification

2. biodeterioration

3. biotransformation

4. biogeochemical cycling

Acid rain is caused by increase in the atmospheric concentration of

1. SO₂ and NO₂

2. SO₃ and CO

3. CO₂ and CO

4. O₃ and dust