Deficiency symptoms of readily mobilised essential elements will first appear in_____

Answer: BSolution: For elements that are actively mobilised within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues e.g., the deficiency symptoms of nitrogen (N), potassium (K) and magnesium (Mg) are visible first in the senescent leaves. in the older leaves, biomolecules containing these elements are broken down, making thse elements available for mobilising to younger leaves.