- A Potassium
- B Phosphorus
- C Calcium
- D Zinc
Correct answer: C. Calcium
Explanation: Calcium forms calcium pectate in the middle lamella of plant cell walls, cementing adjacent cells together. Calcium deficiency causes distorted and failed development of growing tips (terminal bud death).
Concept context
Essential mineral elements, their roles and deficiency symptoms. Nitrogen fixation and soil nutrition.