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What is true about the phosphorus cycle?
$I.$ Rocks are the natural reservoirs of phosphorus
$II.$ Weathering of sedimentary rocks makes phosphate available to the soil
$III.$ Herbivores and carnivores obtain phosphorus from plant directly or indirectly Choose the correct option
$I \;and\; II$
$I \;and \;III$
$II \;and \;III$
$I, II \;and\; III$
Solution
The major reservoir for phosphorus is in phosphate rocks and fossil bone deposits laid down in the past geological ages. There is no atmospheric phase in the phosphorus cycle. Phosphorus becomes available in the soil for plants use by natural erosion of rocks and by human efforts. Plants takes up phosphorus form the soil. Animals get it from the plants directly or through other smaller animals. Animals excrete phosphorus mainly as phosphates, which the plants can use immediately
