Concept of Ecosystems

Environment and Ecology

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

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UPSC CSP Previous Year Paper (2013)

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Oceans, lakes, grasslands, mangroves

Mangroves, oceans, grasslands, lakes

Mangroves, grasslands, lakes, oceans

Oceans, mangroves, lakes, grasslands

Explanation:

Productivity is divided in to two, primary productivity and secondary productivity. Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis. It is expressed in terms of weight or energy. The productivity of Ecosystems (expressed in units of mass per unit surface per unit time) are as following It is usually-

Mangroves-2500

Grassland-500

Lakes-500

Open Ocean-125