A) Trace elements
B) Essential elements
C) Nitrogen
D) Mineral elements
Correct Answer: C
Solution :
Plant ash is the residue left after the dry matter of the plant has been burnt. It contains only mineral elements. About 60 different minerals have been reported from plant, out of 30 are present in all plants and rest in some plants of the approximately 30 elements universally present in all plants, near about 16 are essential and the rest are non-essential elements. Some important essential elements are-carbon, hydrogen, oxygen, sulphur, phosphorus etc.
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