Final answer:
Carbohydrates are the macronutrient that serves as the primary source of energy for daily activities among the given options. The correct answer is option 1.
Step-by-step explanation:
Carbohydrates as a Source of Energy
Among the options provided - water, fats, proteins, and carbohydrates - the macronutrient that serves as a ready source of energy for daily activities is carbohydrates. Carbohydrates can be found in various forms such as simple sugars and complex polysaccharides. Simple sugars like glucose are directly used by the body's cells to produce ATP, which is the primary energy currency of our cells, making them an immediate source of energy. On the other hand, complex carbohydrates such as starches found in foods like grains, vegetables, and fruits are broken down into glucose during digestion before they can be utilized by the body.
When consumed, carbohydrates serve dual purposes. Firstly, they provide about 70% of the daily calorie requirements. Secondly, they are also components of cell membranes and receptors. In addition to supplying quick energy, carbohydrates are synthesized in the body from non-carbohydrate sources and stored as glycogen or converted into fat for long-term energy reserves.
Overall, carbohydrates are the main source of energy for humans, providing fuel for both immediate use and storage, and thus are essential for keeping up with the energy demands of daily activities. Therefore, the correct option for the question of which nutrient provides a ready source of energy for daily activities is carbohydrates.