Discussion
Which of the following is not benefit of vegetation in a watershed ?
Answer: A
The option that is not a benefit is Increases soil compaction.
Vegetation does the reverse: roots open channels in the soil and leaf litter adds organic matter, which keeps the soil loose and porous, so more rain soaks in. Compaction is a harm, caused by grazing, machinery and bare ground, and it increases runoff.
The other three are genuine benefits. Plant cover and litter slow overland flow, the canopy intercepts falling drops so they do not dislodge soil (raindrop splash), and roots and stems trap and hold sediment, which is why vegetation is central to watershed management.
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