- A Purple coloration appearing across the stems and petioles
- B Interveinal chlorosis in young leaves
- C Sudden wilting of the entire shoot system
- D Unusually thick, dark green leaves overall
Correct answer: B. Interveinal chlorosis in young leaves
Explanation: Iron deficiency causes interveinal chlorosis (yellowing between veins while veins remain green) first in young leaves because iron is immobile in plants. Iron is needed for chlorophyll synthesis and electron transport.
Concept context
Essential mineral elements, their roles and deficiency symptoms. Nitrogen fixation and soil nutrition.