Which of the following statements are correct about the deposits of 'methane hydrate'?

1. Global warming might trigger the release of methane gas from these deposits.

2. Large deposits of 'methane hydrate' are found in Arctic Tundra and under the seafloor.

3. Methane in atmosphere oxidizes to carbon dioxide after a decade or two.

Select the correct answer using the code given below:

Consider the following:

1. Carbon monoxide

2. Nitrogen oxide

3. Ozone

4. Sulphur dioxide

Excess of which of the above in the environment is/are cause(s) of acid rain?

Consider the following pairs:

Sea                   Bordering country

Adriatic Sea       Albania

Black Sea          Croatia 

Caspian             Kazakhstan       

Mediterranean

Sea                    Morocco

Red Sea             Syria

Which of the pairs given above are correctly matched?

Among the following, which one is the largest exporter of rice in the world in the last five years?

Consider the following pairs:

Glacier                  River

Bandarpunch      Yamuna

Bara Shigri          Chenab

Milam                  Mandakini

Siachen              Nubra

Zemu                  Manas

Which of the pairs given above are correctly matched?

In India, the use of carbofuran, methyl parathion, phorte and triazophos is viewed with apprehension. These chemicals are used as