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“If rainforests and tropical forests are the lungs of the Earth, then surely wetlands function as its kidneys.” Which one of the following functions of wetlands best reflects the above statement ?
(a) The water cycle in wetlands involves surface runoff, subsoil percolation and evaporation.
(b) Algae form the nutrient base upon which fish, crustaceans, molluscs, birds, reptiles and mammals thrive.
(c) Wetlands play a vital role in maintaining sedimentation balance and soil stabilization.
(d) Aquatic plants absorb heavy metals and excess nutrients.



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Option D is correct: kidney produce urine by removing toxic waste products and excess water from the body. Similarly the aquatic plants in the wetland remove the heavy metal and other toxic substances.


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