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Which of the following ecosystem has the highest gross primary productivity?

 (a) Grasslands 

 (b) Coral reefs

 (c) Mangroves

  (d) Equatorial rain forest

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Correct Option (b) Coral reefs


 The Gross primary productivity of an ecosystem is the total amount of organic matter produced by its producers, i.e. autotrophs. Coral reefs have maximum and deserts have the lowest productivity.

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