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B
Calcium
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C
Sulphur
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D
Nitrogen
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Solution
The correct option is B Nitrogen Primary nutrients of Macro-elements for plant growth and development are essential elements performing a various metabolic process in plant cell such as permeability of cell membrane, buffering action, enzymatic activity to name some. NPK i.e., Nitrogen, Phosphorus and Potassium are primary nutrients.
Thus, correct answer of following is Option D. and all other given options are Micro-nutrients for plant growth