Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEcosystems3 Marks
Question
Explain xerarch succession highlighting the xeral communities.
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Answer
The series of development stages of biotic succession in an arid area is termed as xerosere while biological succession on an arid area is called xerarch.Primary succession on rocks:
Lichens are the pioneer species on a bare area.
The lichen secretes some acids to dissolve rock and help in weathering and soil formation.
Later, some small bryophytes invade and hold the small amount of soil.
The bryophytes are succeeded by herbs, shrubs and ultimately big trees.
At last, a stable climax forest is formed.
The xerophytic habitat gets converted into a mesophytic one.
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