A nitrogen deficiency causes a uniform yellowing of leaves (chlorosis), while deficiencies of phosphorus can lead to dark green or purple discoloration on older leaves. The exact visual symptom depends on the nutrient and the specific plant, but phosphorus deficiency is directly associated with darker colors in leaves.
Deficiency of_______causes the leaves to develop a dark green colouration.
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Question context
This question is part of 🧫 Biotechnology within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.