Prelims 2013 · Environment · Question 73
Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?
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)