Civil Services Examination · Question 43

"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?

1. AThe water cycle in wetlands involves surface runoff, subsoil percolation and evaporation.
2. BAlgae form the nutrient base upon which fish, crustaceans, molluscs, birds, reptiles and mammals thrive.
3. CWetlands play a vital role in maintaining sedimentation balance and soil stabilization.
4. DAquatic plants absorb heavy metals and excess nutrients.