1641: In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the
1. decomposer microorganisms to the surface.
2. nutrients to the surface.
3. bottom-dwelling organisms to the surface.
Which of the statements given above is/are correct ?
(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only
1642: Near the end of the year 2006, which one of the following countries was suspended from the Commonwealth after a military coup ?
(a) Tanzania
(b) Fiji
(c) Myanmar
(d) Kenya
1643: Two taps can fill a tank separately in 20 minutes and 30 minutes respectively. If both the taps are opened simultaneously, then the tank can be filled in:
(a) 50 minutes
(b) 15 minutes
(c) 12 minutes
(d) 10 minutes
1644: Which one of the following processes in the bodies of living organisms is a digestive process ?
(a) Breakdown of proteins into amino acids
(b) Breakdown of glucose into CO2 and H2O
(c) Conversion of glucose into glycogen
(d) Conversion of amino acids into proteins
1645: Climate is extreme, rainfall is scanty and the people used to be nomadic herders.
The above statement best describes which of the following regions?
(a) African Savannah
(b) Central Asian Steppe
(c) North American Prairie
(d) Siberian Tundra