The barrier which separates the protoplasm from the external environment is known as
Plasma membrane
The barrier which separates the protoplasm from the external environment is known as plasma membrane. Chlorophyll is the pigment which imparts a green colour to the plant. Ribosomes are present in large numbers in all living cells and serve as the site of protein synthesis. The nucleus is the membrane-bound organelle found in the eukaryotic cell that stores hereditary material and controls the overall activity of the cell