Deficiency of which group of elements can cause inhibition of cell division in plants?

Which of the following is $NOT$ a deficiency symptom of mineral nutrition?

Plants show certain morphological changes due to the absence of a specific element. These morphological changes are indicative of the deficiency of that particular element,which are called $........$ of the element.

The cauliflower becomes brown due to the deficiency of:

Deficiency of which of the following elements checks the cell division of cambium but cell elongation continues?

Appearance of yellowish edges in the leaves is due to deficiency of