Description : Nitrogen is an essential constituent of all: (1) Fats (2) Proteins (3) Vitamins (4) Carbohydrates
Last Answer : (2) Proteins Explanation: Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, ... purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division.