Which of the following is a secondary pollutant:
1. PAN
2. CO
3. $N{O}_2$
4. $S{O}_2$

Large-scale death of fish occurs in:
1.  Saline lake
2.  Oligotrophic lake
3.  Eutrophic lake
4.  Shallow lake

The main reason for water bloom in rivers, lakes, sea, etc. is:
1.  Brown algae and green algae
2.  Cyanobacteria and dinoflagellates
3.  Eicchornia
4.  Fishes

Maximum DDT is present in birds feeding on:
1.  Fishes
2.  Meat
3.  Insects
4.  Seeds

Green house effect is:
1.  Gardening outside the house
2.  Global cooling
3.  Global warming
4.  Green colour house

The shell of an egg in a bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of:
1.  Ca ATPase
2.  Mg ATPase
3.  Calmodulin
4.  None

Which is the cause of damage to relative biological effectiveness:

1. High temperature

2. Pollution

3. Radiation

4. Low temperature

Which of the following is absent in polluted water:

1. Hydrilla

2. Water hyacinth

3. Larva of stone fly

4. Blue-green algae

Maximum greenhouse gas is released by which country:

1. India

2. France

3. U.S.A.

4. Britain

Fluoride pollution mainly affects:

1. Brain

2. Heart

3. Teeth

4. Kidney