Which of the following is known as the natural reservoir of phosphorous?

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Editor">Editor Staff asked 4 months ago

Which of the following is known as the natural reservoir of phosphorous?
 
(a) Fossils
 
(b) Rocks
 
(c) Animals
 
(d) Water
 
This question was posed to me during an online exam.
 
Asked question is from Ecosystem topic in chapter Ecosystem of Biology – Class 12

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Editor">Editor Staff answered 4 months ago

Right answer is (b) Rocks
 
Easy explanation: The crystalline, sedimentary rocks are known as the natural reservoir of phosphorous. They contain phosphorous in the form of phosphates known as phosphorite. It contains almost 4% to 20% of phosphate.