Civil Services Prep

Prelims 2013 · Environment · Question 73

Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?

  1. Oceans, lakes, grasslands, mangroves
  2. Mangroves, oceans, grasslands, lakes
  3. Mangroves, grasslands, lakes, oceans
  4. Oceans, mangroves, lakes, grasslands

Answer

Mangroves, grasslands, lakes, oceans

  • (a) Oceans, lakes, grasslands, mangroves — Incorrect. Mangroves are among the most productive ecosystems, while oceans have relatively low productivity per unit area.
  • (b) Mangroves, oceans, grasslands, lakes — Incorrect. After mangroves, grasslands and lakes are generally more productive than open oceans.
  • (c) Mangroves, grasslands, lakes, oceans — Correct. The broad decreasing order of productivity is mangroves > grasslands > lakes > oceans.
  • (d) Oceans, mangroves, lakes, grasslands — Incorrect. Oceans cannot come before mangroves in decreasing productivity.

Answer: (c)

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