- A Yellowing of leaves from chlorophyll loss
- B Death of plant tissue (brown/black dead patches)
- C Increased growth from hormone imbalance
- D Localized rot confined only to roots
Correct answer: B. Death of plant tissue (brown/black dead patches)
Explanation: Necrosis means localized death of tissue, appearing as brown or black patches. Potassium deficiency typically causes necrosis at leaf margins and tips.
Concept context
Essential mineral elements, their roles and deficiency symptoms. Nitrogen fixation and soil nutrition.