“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?
- The water cycle in wetlands involves surface runoff, subsoil percolation, and evaporation.
- Algae form the nutrient base upon which fish, crustaceans, molluscs, birds, reptiles, and mammals thrive.
- Wetlands play a vital role in maintaining sedimentation balance and soil stabilization.
- Aquatic plants absorb heavy metals and excess nutrients.
Explanation
Option (d) is correct
- Wetlands play a critical role in maintaining ecological balance and supporting biodiversity.
- Often described as the “kidneys of the Earth,” wetlands are essential for filtering and regulating water, akin to how kidneys filter blood in the human body. Their functions include:
- Wetlands act as natural filters. Aquatic plants in wetlands absorb heavy metals and excess nutrients from the water, helping to cleanse and purify it.
- Water Storage and Flood Prevention: Wetlands store water and gradually release it, acting as natural sponges. They absorb excess water during floods, slowing it down and distributing it more evenly across floodplains. This prevents flooding and manages water flow.
- Groundwater Recharge: Wetlands allow water to percolate into the ground, replenishing groundwater supplies. This function is crucial for maintaining water resources during dry periods.
- Erosion Control: By trapping sediments, wetlands help prevent soil erosion. This stabilization is especially important in areas prone to soil degradation.
- Biodiversity Support: Wetlands provide habitats for a wide range of species, including plants, birds, fish, and amphibians. They support complex food webs and contribute to high levels of biodiversity.
- Recreational and Cultural Value: Wetlands offer spaces for recreation and have cultural significance, providing areas for activities like birdwatching and fishing, and contributing to local cultural traditions.
