Question

Which is not true regarding wetlands?
(A) Natural ground water recharging systems
(B) Used as pasture land
(C) Purify runoff water
(D) Act as sedimentation traps

Answer 1

Hint: In order to answer such questions you should have knowledge about different types of ecosystems. Wetlands are also ecosystems which remain covered with water for a greater proportion of time.

Step by step solution:
Wetlands are regions where water can either permanently cover the earth or remain nearby throughout the year. It provides habitat for both aquatic and terrestrial species. The climate, soil, vegetation, hydrology, chemistry, and human disturbance all have a significant impact on how they differ. Wetland is defined as "a region of land that is typically saturated with water" in its simplest form. Wetlands are places where "water covers the soil, or is present either at or near the surface of the soil either all year or for variable periods of time during the year, including during the growing season," to put it more accurately. Wetlands are geographical regions where the soil is permanently or intermittently covered by water. Swamps and marshes are some examples. lakes, lagoons, and billabongs. mudflats and saltmarsh.
When saturated or flooded circumstances persist throughout the growing season for long enough to create anaerobic (oxygen-depleted) zones in the upper section of the soil, which includes the root zone, wetland, or hydric, soils are created. Such soils may be mineral-based or organic (containing organic molecules). Flow management, erosion control, floodplain agriculture, plant and animal products, conservation, tourism and recreation, water quality, and carbon sinks are all functions of wetlands.
So, option (B) is correct.

Note: According to a recent study, wetlands around the world have lost 50% of their area in the past century. The research, which was released on Tuesday, stated that, "using mangroves as an example, 20% (3.6 million hectares) of total covering has been lost since 1980, with recent rates of loss of up to one percent each year."