LIFE SCIENCE

Detailed explanation-1: -Most of the energy required by the human body is provided by carbohydrates and lipids. As discussed in Chapter 3 “Carbohydrates", glucose is stored in the body as glycogen. While glycogen provides a ready source of energy, lipids primarily function as an energy reserve.

Detailed explanation-2: -Forming the exoskeletons of insects is not the function of lipid. Lipid is an important organic compound required by the body for number of functions. Exoskeleton of insects is made of chitin which is a modified carbohydrate. Lipid is stored in the body in the form of triglycerides.

Detailed explanation-3: -Cholesterol is the other major lipid transported in lipoproteins. It is not used for energy; it is the precursor of steroid hormones and bile acids and is a structural component of cellular membranes.

Detailed explanation-4: -Within the body, lipids function as an energy reserve, regulate hormones, transmit nerve impulses, cushion vital organs, and transport fat-soluble nutrients.