First slide

Nutrient Cycling

Question

Natural reservoir of phosphorus is

Easy

A

rock
B

fossils
C

sea water
D

animal bones.

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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