Which of the following constituents of food is the chief source of energy?

Correct option is A

Ans (a)
Sol.
Carbohydrates are the primary and most readily available source of energy for the body. They are broken down into glucose, which is used by cells to produce energy through cellular respiration. Examples include rice, bread, and fruits.
Proteins are primarily used for growth, repair, and maintenance of tissues. They can provide energy, but this is not their primary function.
Vitamins are essential for various biochemical processes and maintaining health but do not provide energy.
Lipids (Fats) are a secondary source of energy, providing more energy per gram than carbohydrates but are not the chief or immediate source of energy.