JAMB - Biology (1985 - No. 34)
A young plant showing yellow leaves is likely NOT to be deficient in?
calcium
magnesium
potassium
boron
Εξήγηση
Calcium is essential for cell wall development and root growth, but its deficiency tends to manifest differently than yellow leaves. Yellow leaves in a young plant are often a symptom of nutrient deficiencies. However, calcium deficiency typically causes different symptoms, such as:
- Tip burn or necrosis (death of cells) on young leaves
- Distorted or curled leaves
- Weakened stem and root growth
In contrast, deficiencies in the other options can cause yellow leaves:
B. Magnesium deficiency: Interveinal chlorosis (yellowing between veins)
C. Potassium deficiency: General yellowing or scorching of leaves
D. Boron deficiency: Yellowing or chlorosis of leaves, especially in young plants