Which one of the following plants is popularly grown along the road for absorbing vehicular pollutants?

Consider the following:

1. Photosynthesis

2. Respiration

3. Decay of organic matter

4. Volcanic action

Which of the above 'adds' carbon dioxide to the carbon cycle on Earth?

Assertion (A) The ozone layer in stratosphere filter out the UV rays present in incoming sunlight.

Reason (R) The ozone present in the troposphere creates pollution problems and smog is rich with it.

Consider the following statements

1. Kyoto Protocol came into force in the year 2005.

2. Kyoto Protocol deals primarily with the depletion of the ozone layer.

3. Methane as a green house gas is more harmful than carbon dioxide.

Which of the statements given above is/are correct?

Microbial fuel cells are considered as the sources of sustainable energy. Why? 

1. They use living organisms as catalysts to generate electricity from certain substrates.

2. They use a variety of inorganic materials as substrates.

3. They can be installed in wastewater treatment plants to cleanse water and produce electricity.

Which of the statement(s) given above is/are correct?