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?

[UPSC Civil Services Exam – 2011 Prelims]

(a) 1 and 2

(b) 2 only

(c) 2 and 3

(d) 3 only


Answer: (b)        

Explanation:

  • Regions of upwelling are the most productive areas of the world’s oceans.
  • Upwelling in coastal waters brings nutrient-rich water toward the surface. Statement 2 is correct.
  • These conditions promote the rapid reproduction of phytoplankton, and grazing zooplankton also multiplies, which provides an abundant food supply for nekton.
  • Due to this high productivity, some of the world’s richest fisheries are found in regions of upwelling, such as the temperate waters off Peru and California.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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