(A) Nitrogen is a primary macronutrient essential for plant growth. It is a major component of amino acids,proteins,nucleic acids,and chlorophyll. $A$

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(A) Nitrogen is a primary macronutrient essential for plant growth. It is a major component of amino acids,proteins,nucleic acids,and chlorophyll. $A$ deficiency of nitrogen leads to chlorosis (yellowing of leaves),stunted growth,and a significant reduction in the overall growth and size of leaves.