What is the increase in the concentration of various toxic substances along the food chain is called ? .

1. Eutrophication
2. Bio-accumulation
3. Biomagnification
4. Demagnification

Name the phenomenon of concentrated toxic deposition at the higher trophic level.

1. Bio-accumulation
2. Biomagnification
3. Eutrophication
4. Biodegradation

The warming up of the atmosphere due to the increased concentration of GHG is known as ……………. .

1. Global Warming
2. Climate change
3. Acid rain
4. Radiation

Assertion (A): Climate change is a result of increased GHG emissions.

Reason (R): Use of fossil fuels, population growth and reduced green cover result in GHG emissions.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.