Concept explainers
(a)
Interpretation:
The region of earth’s crust that is not involved in phosphorous cycle has to be identified.
Concept introduction:
Phosphorous cycle: In environment, phosphorous cycle involves three interlocking subcycles. Land based cycle indicated by yellow arrows in figure completed in a matter
of years and a water based cycle indicated by blue arrows completed in weeks to years are superimposed on an inorganic cycle (pink arrows) that takes millions of years to complete.
Figure 1
(b)
Interpretation:
The two roles of organisms in phosphorous cycle has to be named.
Concept introduction:
Phosphorous cycle: In environment, phosphorous cycle involves three interlocking subcycles. Land based cycle indicated by yellow arrows in figure completed in a matter
of years and a water based cycle indicated by blue arrows completed in weeks to years are superimposed on an inorganic cycle (pink arrows) that takes millions of years to complete.
Figure 1
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