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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

 Explanation:

 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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