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51.

`CO_(2)` content of atmosphere has increased in the last 150 years fromA. 25 to 35 ppmB. 270 to 340ppmC. 0.027 to 0.34ppmD. 0.2 to 0.3 ppm

Answer» Correct Answer - b
`CO_(2)` conc. Was about 270ppm in 1750and 368 ppm in 2000. The rise has been due to large scale deforestation (for grazing land, cropland or urban estates). Change in land use and large scale combustion of fossil fuels.
Discussion
52.

The reservoir for the gaseous type of biogeochemical cycle exists inA. StratosphereB. AtmosphereC. LonosphereD. Lithosphere

Answer» Correct Answer - b
Discussion
53.

The region consisting of long and severe winters and grwoting season consisting of few months of summers constitutes.A. Savannah ecosystemB. Tiaga ecosystemC. Tundra ecosystemD. None of the above

Answer» Correct Answer - c
Tundra biome is characterised by desert like levels of precipitation (less than 25cm annually). Extremely long and cold writers and short warmer summers.
Discussion