Bone meal contains . . . . . . . . % of P2O5.

Answer: Option B

Bone meal is a mixture of finely and coarsely ground animal bones and slaughterhouse waste products. It is used as a dietary supplement to supply calcium and phosphorus to monogastric livestock in the form of hydroxyapatite.
It is slow release organic fertilizer, it supplies phosphorus, Calcium and a small amount to plants.
Bone meal contains 20% of P₂O₅.