Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?
Detailed Explanation:
Ecosystems ranked by Net Primary Productivity (NPP) from highest to lowest:
Mangroves (high NPP) – receive nutrient inputs from both terrestrial runoff and tidal flushing, warm tropical climate, high photosynthetic rates
Grasslands (moderate NPP) – abundant herbaceous vegetation with productivity dependent on rainfall, soil fertility, and grazing intensity
Lakes (moderate to low NPP) – productivity varies with nutrient status (eutrophic > oligotrophic), generally lower than terrestrial ecosystems
Oceans (lowest NPP) – particularly open ocean zones have limited nutrient availability in photic zones, lowest productivity despite covering largest area
Question 6 of 6 Structure and Functions of Ecosystem
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