Answer:
(a) The cycling of phosphorus between biotic & abiotic components of the environment represent phosphorus cycle.
(b) Phosphorus is present in bio membranes (as phospholipids), nucleic acids (as phosphoric acid), nucleotides (as AMP, ADP, ATP etc), bones and teeth (as hydroxyapatite), etc.
(c) Consumers obtain phosphorus directly or indirectly from plants.
(d) Phosphorus is also present in phosphate rocks. It is released during the decomposition of plant and animal remains.
(e) The released phosphorus may reach the deeper layers of soil and gets deposited as phosphate rocks.
(f) Phosphorus containing rocks are mined for manufacture of fertilizers, which provide an additional supply of an organic phosphates to the abiotic environment.
(g) All plants and animals eventually die and in due time, their organic remains or debris decay through the action of microorganisms and the phosphates are release into the water for recycling.
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