How does plantation on lake shores help reduce siltation?

Correct answer: Vegetation binds soil and reduces erosion

The direct answer is A: vegetation binds soil and reduces erosion. Siltation means the settling and accumulation of soil particles, called silt, in a lake. When rain falls on bare lake banks, water can carry loose soil into the lake. Roots hold soil particles together, stems and leaves slow the movement of rainwater, and plant cover helps water enter the ground instead of rushing away. Therefore, less soil reaches the lake and siltation decreases. Option A is correct because it gives the real cause-and-effect chain: plants protect soil, reduced erosion means less silt enters the lake, and the lake remains healthier. Option B is wrong because plants do not stop the sea; the question concerns soil entering a lake. Option C is wrong because plantation does not immediately make freshwater saline; salinity depends on dissolved salts and water conditions. Option D is wrong because vegetation neither paves nor transforms a lake into a plain. Planting along shores is therefore a useful conservation measure. Memory cue: roots hold, leaves slow, and less soil settles.