Q.

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

A. Oceans, mangroves, lakes, grassland
B. Mangroves, oceans, grassland, lakes
C. Oceans, lakes, grassland, mangroves
D. Mangroves, grasslands, lakes, oceans
Answer» D. Mangroves, grasslands, lakes, oceans
Explanation: 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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