Q. The moss which forms dense extensive mats on the soil prevents

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Solution:

Bryophytes are the amphibian group of plants. They play a vital role in the ecological succession, specifically in the xerosere. They are the first few communities which could settle in the extremely hostile conditions. They, with their small rhizoids, help in soil formation.
On the other hand, they form a thick cushion-like covering on the soil and help in soil binding and prevent soil erosion.