Q.Mention any three functions of lipids in living organism.

Lipids serve several vital biological roles beyond simple energy storage: they form the structural bilayer of cell membranes, act as the body's most concentrated stored energy reserve, and provide thermal insulation and mechanical protection to internal organs.

Lipids (fats, oils, phospholipids, waxes and steroids) perform several important functions in living organisms, including:

1. Structural components of cell membranes: phospholipids are the major structural constituent of all cell membranes, self-assembling into a bilayer that forms the boundary of the cell and its organelles, controlling the passage of substances in and out.
2. Storage form of energy: fats (triglycerides) are the most concentrated, efficient form of stored chemical energy in the body — providing more than twice the energy per gram compared to carbohydrates or proteins — and are stored in adipose tissue for use when required. …