Q 2. With reference to agricultural crops N, P, K are considered as ..............
(a) Critical element
(b) Non-critical element
(c) Non-essential element
(d) Minor element

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Please find below the solution to the asked query         
                                                   
With reference to agricultural crops N, P, K are considered as the Critical elements. They are usually referred to as essential elements to the growth of crops.
Hence, option (a) is correct. 

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