The soluble part of the blood is called:

Explanation

Option A: Karyolymph is the fluid portion of the nucleus of a cell. It is made up of water, salts, and dissolved proteins. Karyolymph does not contain any organelles, such as chromosomes or ribosomes. Option B: Nucleoplasm is another term for karyolymph. It is the fluid portion of the nucleus of a cell. Option C: Protoplasm is the living material that makes up cells. It is made up of water, proteins, carbohydrates, lipids, and nucleic acids. Protoplasm is not soluble in blood because it is a complex mixture of molecules that are held together by bonds. Option D: Serum is the liquid portion of blood that remains after blood cells and clotting factors have been removed. It is mostly water, but it also contains dissolved proteins, nutrients, hormones, and electrolytes. Serum is soluble in blood because it is a relatively simple mixture of molecules that are not held together by strong bonds.