Q.

Natural reservoir of phosphorus is

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a

rock

b

fossils

c

sea water

d

animal bones.

answer is A.

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Detailed Solution

The natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants. A simplified model of phosphorus cycling in a terrestrial ecosystem is shown below:
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Natural reservoir of phosphorus is