The correct option is (c) 1 and 3 only.
Explanation
Food items are complex mixtures of various chemical substances known as nutrients. While specific foods are often categorized based on their predominant nutrient, they rarely consist of a single nutrient in isolation.Statement-wise Analysis:
- Statement 1 is Correct: Most natural food items contain a combination of nutrients, including carbohydrates, proteins, fats, vitamins, and minerals, rather than just one. For example, milk contains proteins, fats, carbohydrates (lactose), vitamins, and minerals.
- Statement 2 is Incorrect: While rice is a major source of starch (a carbohydrate), it is not composed only of carbohydrates. Rice also contains small amounts of proteins, dietary fiber, and traces of vitamins and minerals. No natural food item (except perhaps highly refined substances like pure sugar or oil) consists exclusively of a single nutrient.
- Statement 3 is Correct: In many food items, one specific nutrient is present in a significantly larger quantity than others. For instance, rice has a much higher concentration of carbohydrates compared to other nutrients. Therefore, it is classified as a "carbohydrate-rich" source of food.
Key Takeaway: Natural food ingredients are composite mixtures of nutrients. They are classified as "rich" in a particular nutrient (e.g., carbohydrates in rice) based on the relative abundance of that nutrient, not its exclusive presence.