Which substance plays a major role in most of the chemical reactions that occur in living cell

Water

Water is the substance that plays a major role in most of the chemical reactions that occur in living cell.

Water is a clear, tasteless, and odourless substance that is found in high amounts in living organisms, and is required by all forms of life. Water plays a major role in most of the chemical reactions that occur in living cells. Water is present both within and outside cells, and almost all chemical reactions take place in water solution. Water also acts as metabolite in many chemical reactions. It is either a reactant or a product of reaction. Water is involved in chemical processes such as digestion, photosynthesis, and aerobic respiration.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a