Why do fruits grow on trees while other foods like vegetables grow in the ground?
user
A fruit is an edible plant part that has a seed in its center.  Fruits contain a lot of nutrients, including fats, vitamins, and carbohydrates, and therefore they are used as a source of food.  Plants need to reproduce, so they contain the parts of a fruit, which then ripen and split open to release seeds.  These seeds grow and become the new plant.  Some fruits are commonly eaten, like strawberries and oranges.
assistant
But why do foods like oranges grow from tree branches while foods like potatoes grow from the ground? What's the physiological difference between the foods?
user
It is the environmental conditions that determine whether the food can grow in the ground or on the tree branch.  Vegetables that grow from the ground do so in soil that is porous, where oxygen and water flow through.  This is because the roots have evolved to use oxygen and water from the surrounding soil.  Trees, on the other hand, don’t need soil or oxygen.  A potato’s root is able to extract water and minerals from the soil in order to survive, but the nutrients are easily stored in its leaves, so there is little reason for the potato to need oxygen and water.  Therefore the potato needs to grow on a tree branch in order to acquire more nutrients from the sunlight that comes from above the branches.
assistant
Why did you say a potato needs to grow on a tree branch at the very end? Potatoes don't grow on tree branches.
user
I made a mistake, let me edit it.  I meant to say that a potato doesn't need to grow on a tree branch, so it has no physiological need to do so.  But its growing conditions, such as soil nutrients, determine which plants will survive.  If the soil contains enough nutrients and water for a potato to grow, then the potato will have a physiological advantage over all the other plants that don’t have roots that can obtain nutrients from the soil.  This gives potatoes a selective advantage.  The potato’s advantage means that it will thrive in the soil where the other plants fail.  Other conditions will come into play, such as the temperature and sunlight, but the soil provides the nutritional advantages that are key.
assistant
Why do fruits grow on trees while other foods like vegetables grow in the ground?
user
A fruit is an edible plant part that has a seed in its center.  Fruits contain a lot of nutrients, including fats, vitamins, and carbohydrates, and therefore they are used as a source of food.  Plants need to reproduce, so they contain the parts of a fruit, which then ripen and split open to release seeds.  These seeds grow and become the new plant.  Some fruits are commonly eaten, like strawberries and oranges.
assistant
But why do foods like oranges grow from tree branches while foods like potatoes grow from the ground? What's the physiological difference between the foods?
user
It is the environmental conditions that determine whether the food can grow in the ground or on the tree branch.  Vegetables that grow from the ground do so in soil that is porous, where oxygen and water flow through.  This is because the roots have evolved to use oxygen and water from the surrounding soil.  Trees, on the other hand, don’t need soil or oxygen.  A potato’s root is able to extract water and minerals from the soil in order to survive, but the nutrients are easily stored in its leaves, so there is little reason for the potato to need oxygen and water.  Therefore the potato needs to grow on a tree branch in order to acquire more nutrients from the sunlight that comes from above the branches.
assistant
Why did you say a potato needs to grow on a tree branch at the very end? Potatoes don't grow on tree branches.
user
Sorry about that, I misspoke.  I meant that it is a tree that the potato needs to grow on.
assistant
Why do fruits grow on trees while other foods like vegetables grow in the ground?