Guano deposits are rich in ________

Sulphur

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Magnesium

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Phosphorus

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Calcium

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Solution

The correct option is D Phosphorus
Arachnids (spiders and scorpions) excrete mostly guanine and hence are said to be guanotelic. Guanine, like uric acid, is relatively non-toxic and insoluble and is excreted in solid form. It is an adaptation to life in arid habitats. Due to its richness in phosphorus, it is also used as a fertilizer.
So, the answer is 'Phosphorus'.

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