Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYEcosystems5 Marks
Question
Trace the succession of plants on a dry bare rock.
How does phosphorus cycle differ from carbon cycle?
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Answer
Primary succession - lichens, secrete acids to cause weathering of rock and soil formation, Small plants like bryophytes, to hold the soil, Herbs, scrubs, shrubs succeed in existence, Trees, forest, climax community.
No respiratory release of phosphorus unlike CO2 in carbon cycle/No gaseous exchange.
Inputs of phosphorus through rainfall is less than carbon input.
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