Which of the following is the medium of transportation of nutrients with unicellular organisms?

Among the options given, the medium of transportation of nutrients with unicellular organisms is protoplasm. Protoplasm is a jelly-like substance that makes up the entire cell of unicellular organisms. It contains all the organelles and structures necessary for the cell to carry out its functions, including the transportation of nutrients. In unicellular organisms, nutrients enter the cell through the cell membrane and are transported throughout the cell via the protoplasm. The protoplasm also helps to eliminate waste products from the cell. Blood, serum, plasma, and lymph are all fluids found in multicellular organisms that are used for transportation of nutrients and waste products, but they are not relevant for unicellular organisms as they do not have specialized circulatory systems.