Explain xerarch succession

Explanation

(a) The species that invades bare area are called pioneer species.
(b) In primary succession on bare rock the pioneer species is the lichen.
(c ) Lichen secretes acid to dissolve rock, helping in weathering and soil formation.
(d) The little soil, leads to growth of bryophytes (mosses).
(e ) The mosses speed up the process of soil accumulation by trapping wind-blown particles.
(f) Lichen moss carpet provides suitable substratum for the germination of seeds of herbaceous plants.
(g) Gradually more soil is accumulated and herbaceous species make way for the invasion of shrubs followed by trees.
(h) The climax community is generally dominated by trees.