What type of food is commonly described as 'sweet food from plants'?

The description of 'sweet food from plants' is most commonly associated with fruit. Fruits develop from the flowering part of plants and typically contain seeds. They are known for their natural sweetness due to the sugars they contain, such as fructose and glucose. This sweetness is not only appealing but also a significant factor that contributes to their popularity as a snack or dessert option.

In contrast, vegetables, grains, and dairy have different characteristics. Vegetables can include a variety of edible plants but are generally more savory and lack the sweetness that is characteristic of fruits. Grains, which include rice, wheat, and oats, serve as staple foods that provide carbohydrates but do not fall into the category of sweet foods derived from plants. Dairy, on the other hand, comes from animals and is not classified as a plant-based food at all; it includes products like milk, cheese, and yogurt, which have their own distinct flavors and are not primarily sweet due to natural plant sugars. Thus, fruit is the correct answer given its specific association with being a sweet food derived from plants.