Ans. Mineral deficiencies in plants can lead to visible symptoms, indicating their importance. Some common symptoms of mineral deficiencies include:- Nitrogen deficiency: Yellowing of older leaves (chlorosis) and stunted growth.- Phosphorus deficiency: Dark green or purple leaves, delayed flowering, and poor root development.- Potassium deficiency: Yellowing and curling of leaf margins, weak stems, and reduced fruit size.- Calcium deficiency: Stunted root growth, distorted leaves, and blossom-end rot in fruits.- Magnesium deficiency: Interveinal chlorosis in older leaves, leaf curling, and reduced growth.