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GS Geography Physical Geography of World
Q.

Which one of the following is the correct sequence of ecosystem in the order of decreasing productivity?
Explanation:

ANS. (D) 
Productivity is the rate of organic matter or biomass production. The average ocean productivity is about 50 grams’ carbon per square meter per year; while, the average land productivity is 160 grams’ carbon per square meter per year. Salt marshes and mangroves have one of the highest productivity of 3300-6000 grams’ carbon per square meter per year. So the correct sequence of ecosystem in the order decreasing productivity is: Mangroves > Grasslands> Lakes > Oceans.

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