Fruit

Fruits are the seed-bearing parts of flowering plants, forming after the flower's ovary develops. They play a key role in spreading seeds, helping plants grow in new places. Many animals, including humans, rely on fruits for food, creating a helpful relationship where fruits get dispersed while animals get nutrition.

In everyday language, fruits are usually sweet or sour parts of plants we can eat raw, like apples, bananas, grapes, lemons, oranges, and strawberries. But in plant science, the word "fruit" includes many other things too, such as nuts, bean pods, corn kernels, tomatoes, and even wheat grains. Fruits are important in farming and have deep cultural meanings for many people around the world.

Botanical vs. culinary

See also: Vegetable § Terminology

In science, a fruit is a part of a plant that comes from the flower and contains seeds, like an orange or a tomato. But in everyday cooking, we often call things like cucumbers or peppers "vegetables" even though they are fruits in science.

For example, in the kitchen, fruits are usually sweet foods like peaches, while vegetables are savory foods like lettuce. But this isn't always true — tomatoes can taste sweet or savory, and rhubarb is often used like a fruit in pies even though it’s actually a plant stem.

Structure

The outer part of most fruits, which you often eat, is called the pericarp. It usually comes from the ovary and surrounds the seeds. In some fruits, other parts also help make up what we eat. The pericarp can be divided into three layers: the outer epicarp, the middle mesocarp, and the inner endocarp.

Sometimes, fruits have a noticeable pointy end and are called beaked.

Development

A fruit grows from a flower after it has been fertilized. Inside the flower, there is a special part called the gynoecium, which includes the ovary. The ovary contains tiny structures called ovules. When a flower is pollinated, pollen moves from the part called the stamens to the stigma, and a tube grows down to the ovary. This leads to fertilization, where the ovules become seeds.

As the seeds form, the ovary also changes. It can become soft and fleshy, like in berries, or hard, like in nuts. The wall of the ovary, called the pericarp, has different layers. Sometimes, other parts of the flower, like petals or sepals, stay and become part of the fruit, as in apples or strawberries. Fruits can develop in different ways, from a single flower or from many flowers together.

Classification

Plants have different ways of making fruits, and scientists group them into three main types: simple fruits, aggregate fruits, and multiple fruits. These groups help us understand how fruits grow and change from flowers.

Simple fruits come from one flower with one pistil. They can be dry, like nuts or pods, or fleshy, like apples or tomatoes. Dry fruits may split open to release seeds, while fleshy fruits often rely on animals to eat them and spread the seeds.

Aggregate fruits form from one flower with many pistils. Each pistil makes a small fruitlet, and together they create the final fruit. Examples include raspberries and blackberries. Multiple fruits, like figs and mulberries, come from many flowers merging into one fruit.

Seedless fruits

Some fruits we enjoy every day don’t have seeds inside them. Bananas, pineapples, many kinds of citrus fruits, table grapes, and some watermelons are examples of seedless fruits that people grow and sell widely. These fruits can be seedless because of natural processes. One way this happens is called parthenocarpy, where the fruit grows without being fertilized. Another way, seen in seedless bananas and grapes, is that the tiny plant inside the seed doesn’t develop fully, even though pollination and fertilization happen normally.

Seed dispersal

Fruits have many ways to help their seeds spread. Some fruits have hooks or spines that stick to animals, letting the seeds travel far away. Others are tasty and attract animals that eat them and carry the seeds to new places.

Some fruits have wings or parachutes that help them float away in the wind. There are even fruits, like coconuts, that can float in water to spread their seeds to distant lands.

Food uses

Many types of fruits, from apples and berries to watermelon and coconuts, are important for food. We enjoy them fresh or in jams, and they are used in many foods like cakes, ice cream, and drinks. Some fruits, like olives, are pressed to make oils.

Fruits are also used for special occasions, such as in fruit baskets or bouquets. They are sold in markets and used in kitchens to make meals. Proper storage helps keep fruits fresh longer, and eating fruits can be good for health because they have fiber, water, and vitamin C. It's important to handle and prepare fruits safely to avoid getting sick. Some people can have allergies to certain fruits.

Nonfood uses

Fruits have many uses beyond being eaten. For example, bayberry fruits can make wax for candles, and dry fruits like annual honesty and cotoneaster are used in decorations. Some fruits, like opium poppy, produce substances used in medicines, while others, like Osage orange, help keep pests away.

Fruits also give us natural colors for dyeing, and dried gourds can become bird houses or musical instruments. Pumpkins are carved for Halloween fun, and the fiber from luffa fruits works as a sponge. The coconut shell can be crafted into many items, from bowls to souvenirs, and the fiber from coconut shells is used in many household items.