Flower

Flowers, also called blossoms or blooms, are the parts of flowering plants that help them make new plants. They usually have four main parts arranged in circles around the end of a stem: sepals, which protect the flower; petals, which often attract animals; male stamens that make pollen; and female gynoecia that receive pollen. These parts work together so plants can reproduce.

The growth of flowers is a key part of a plant’s life. Pollen, which carries male cells, moves between flowers through ways like cross-pollination or self-pollination. Animals such as bees and birds, or even wind and water, can help this happen. When pollen reaches the female part of a flower, fertilisation occurs, and a seed grows inside a fruit. The fruit protects the seed and helps it spread away from the plant.

Flowers first appeared between 150 and 190 million years ago during the Jurassic period. Since then, they have become very successful, helping plants reproduce better than plants without flowers. Today, people use flowers for decoration, medicine, food, and perfumes. They also appear in art, stories, and many traditions. Flowers come in many sizes, from tiny orchids to very large blooms, and they are important in ecosystems all over the world.

Etymology

In botany, flowers are special parts of flowering plants that help them make seeds. Other plants, like those with cones, use different parts for this.

The word flower has an interesting history. It came into Middle English from Old French, which got it from Latin. It traces back to even older Proto-Italic words meaning 'flower'. The word blossom is an older Old English word we still use today, especially for flowers on fruit trees. All these words are related, coming from a very old Proto-Indo-European root meaning 'blossoming'.

Function

The main purpose of a flower is to help plants reproduce and survive. Flowers make special cells that create new plants and seeds. They attract animals like bees and butterflies to move pollen from one plant to another. This helps plants mix their genetic material, making the species stronger. Bright colors and sweet smells help flowers attract these animals.

Main article: Sexual reproduction

Structure

Main article: Floral morphology

Flowers are special parts of plants that help them grow new plants. A flower usually has four main parts arranged in circles around a small stem. These parts are called whorls. Starting from the outside, the parts are the calyx, petals, androecium, and gynoecium.

The calyx is made of sepals. These are leaf-like parts that protect the flower when it is growing. Inside the sepals are the petals. Petals are often colorful and help attract animals that can help the plant make seeds. The androecium contains the male parts called stamens, which make pollen. The gynoecium is the female part of the flower. It can receive pollen and help make seeds. These parts work together so plants can reproduce.

Development

Further information: ABC model of flower development

Flowers grow when a plant starts making them instead of regular leaves. This change is guided by genes and the environment. Special cells at the tip of the plant, called the shoot apical meristem, make the parts of the flower. These parts include sepals, petals, and the male and female sections.

The ABC model helps explain how genes work to create each part of the flower. It shows that different genes make sepals, petals, stamens, and carpels in the right places. This helps the flower grow correctly and at the right time, so the plant can reproduce.

Pollination

Main article: Pollination

Flowers are parts of plants that help them make new plants. They bring together sperm from pollen and eggs from the ovary. This process is called pollination. It moves pollen from the male parts of a flower to the female parts. Pollination can happen in the same plant or between different plants. Cross-pollination between plants is more common because it helps create more genetic variation.

Plants have many ways to help pollination. Most use living creatures like insects, birds, bats, and some lizards to carry pollen. These pollinators are often attracted by the flower’s shape, scent, or colors. Some flowers even look or smell like food to draw them in. Other plants use wind or water to move pollen. These plants often have smaller, less colorful flowers.

Fertilisation and seed development

Main articles: Seed development and Fruit § Development

In flowering plants, fertilisation happens when pollen moves from one part of the flower to another. This helps make a new plant. After this, the plant grows a seed inside a fruit. The fruit protects the seed and helps it move to new places to grow.

Seeds are spread by wind, water, or animals. This helps plants grow in new areas and stay healthy. Some fruits open to help scatter their seeds.

Evolution

Further information: Evolutionary history of plants § Flowers, and Floral biology

Flowers first appeared between 150 and 190 million years ago, during the Jurassic period. The earliest flowers come from fossils that are 125 to 130 million years old, from the Early Cretaceous. Before flowers, plants used cones or spores to reproduce. Flowers changed this by letting plants use animals such as insects, birds, and bats to help with pollination.

Flowers gave plants many benefits. They could have both male and female parts, protect their seeds, and make pollen better. They also used a process called double fertilisation to improve reproduction. Because of these advantages, flowering plants became very successful and now make up about 90% of land plants. This success is largely due to their helpful relationships with pollinators.

Taxonomy

Further information: Plant taxonomy and Linnaean taxonomy

The study of plant classification, called plant taxonomy, looks at the shape and features of flowers to group plants together. A scientist named Carl Linnaeus was the first to use flowers to sort plants into groups in his book Species Plantarum. He looked at parts of the flower called stamens.

Today, scientists also use tools to study the genes inside plants and their cells. But the way flowers look still helps scientists understand and group plants.

Uses

Humans have used flowers for thousands of years in many ways. Flowers can make food taste better and look nicer, like in salads. Some flower parts are eaten as vegetables, such as broccoli, cauliflower, and artichoke. Flowers are used to make drinks, like herbal teas, and to give nice smells to perfumes and oils.

Flowers help grow food crops like rice, wheat, and corn. They are also used to make medicines. Some special plants, like cannabis, are grown for their flower parts. In cooking, flowers such as saffron and cloves add flavor and scent to dishes.

In culture

Further information: Human uses of plants § Symbolic uses

Flowers have inspired poets and artists for thousands of years. They appear in stories, paintings, and many celebrations. For example, in Shakespeare’s play A Midsummer Night's Dream, flowers are used in magical scenes.

Flowers often have special meanings. Some, like violets, stand for modesty or affection. They are also used in flags and symbols to represent countries. Each year, people give flowers to show love or to remember someone special. Many cultures use flowers in art, rituals, and in gardens that have been tended for around ten thousand years. Some nations, like Malaysia, have their own national flower, the Hibiscus × rosa-sinensis.