• Phosphorus Deficiency Symptoms in Plants:
• Physiological Symptoms: Phosphorus is mobile within plants and central to energy transfer (ATP, ADP), nucleic acids, and phospholipids.
• Visual Diagnostics: Phosphorus-deficient plants exhibit severe stunting (dwarfing) with abnormally dark green or blue-green foliage. Under severe deficiency, carbohydrate transport is restricted, triggering excessive synthesis and accumulation of anthocyanin pigments that impart a distinct purple or reddish discoloration to older leaves, stems, and petiole veins.
• Conclusion: Plants become dwarfed and foliage becomes dark green (Option 1).

Correct option: (1) Dwarfed and foliage become dark green