1171: 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
1172: In India, rural incomes are generally lower than the urban incomes. Which of the following reasons account for this ?
I. A large number of farmers are illiterate and know little about scientific agriculture.
II. Prices of primary products are lower than those of manufactured products.
III. Investment in agriculture has been low when compared to investment in industry.
Select the correct answer by using the codes given below :
Codes :
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III
1173: Consider the following which can be found in the ambient atmosphere:
1. Soot
2. Sulphur hexafluoride
3. Water vapour
Which of the above contribute to the warming up of the atmosphere ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
1174: 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
1175: Which of the following metals is extracted from the Monazite sand found in plenty in India ?
(a) Gold
(b) Uranium
(c) Thorium
(d) Copper