Plant

Plants are living things. They use light from the sun to make food. They use the green parts of their leaves to do this.

This process also makes the air we breathe.

Some plants are very small. Others are huge trees. Most plants make seeds to grow new ones.

Humans eat plants like fruit and grain. We also use them for medicine. Plants are very important to our world.

Plants are living things that make their own food. Most plants use sunlight to get power. They do this through photosynthesis, which is a way to make sugar.

Inside plant cells, tiny green parts called chloroplasts do the work. These parts use a green color called chlorophyll to catch light. Plants also use water and carbon dioxide to make food. This way of making food lets out oxygen into the air.

Plants come in many shapes and sizes. Some are just one tiny cell. Others are giant trees that grow very tall. Most plants make seeds to grow new ones.

There are about 382,000 known species of plants. Humans use plants for many things. We eat them as grain, fruit, and vegetables. We also use them for medicine and building. The study of plants is called botany.

Plants are amazing living things that belong to a group called Plantae. Most plants use a process called photosynthesis to stay alive. This is a way they make their own food. They use sunlight to turn water and carbon dioxide into sugars.

To catch this light, they use a green pigment called chlorophyll. This pigment lives inside tiny parts of the cell called chloroplasts. Some plants are different and act as parasites. These plants do not make their own food from light. Instead, they get energy from other plants or fungi.

How a plant works depends on its many specialized parts. Most plants are multicellular, meaning they are made of many cells. These cells form tissues like xylem and phloem. These act like tiny pipes to move water and food.

Roots help the plant soak up water and minerals from the soil. Stems provide support and carry nutrients to different parts. Leaves are the main sites for making food from the sun. Flowers are used for reproduction to make new plants. Even the cells have unique features like a strong cell wall. This wall is made of cellulose and keeps the cell from bursting.

People have been studying plants for a very long time. Long ago, a thinker named Aristotle grouped all living things into plants or animals. He thought plants had a "vegetative soul." Later, a scientist named Linnaeus created a modern system for naming things. He called the plant kingdom Vegetabilia. Since then, our definitions have become much more specific. We now use DNA to understand how plants are related. This helps scientists group them into families like the green plants, or Viridiplantae.

There is incredible variety among the 382,000 known plant species. Most plants, about 283,000 species, produce seeds to grow. Some plants are tiny, like desmids that are only 10 micrometres across. Other plants are huge, like the Sequoia sempervirens tree. This tree can grow up to 120 metres tall.

Flowering plants are the most common, making up 85 to 90 percent of all species. Plants also help the whole planet by releasing molecular oxygen. This oxygen is what many animals need to breathe.

Plants are connected to almost everything we do every day. We rely on them for basic foods like grain, fruit, and vegetables. Humans have grown these foods for thousands of years. We also use plants for building houses and making medicine. Even the paper you write on often comes from plants. The scientific study of these living things is called botany. Botany is a special branch of biology that helps us understand our world.

Plants are eukaryotic organisms that belong to the kingdom Plantae. Most plants are photosynthetic, which means they capture energy from sunlight to survive. They use a green pigment called chlorophyll to drive this process. This pigment is located inside specialized structures called chloroplasts. Using these tools, plants turn carbon dioxide and water into sugars. These sugars serve as the primary energy source for the plant.

While most plants make their own food, some are parasitic. These exceptions have lost the genes required for photosynthesis. Instead, they obtain their energy by living off other plants or fungi.

At the cellular level, plant cells have unique features. They possess a large, water-filled central vacuole. This organelle allows the cell to change size while keeping the cytoplasm volume constant. Plant cells also have a strong, flexible cell wall made mostly of cellulose. This wall sits outside the cell membrane and prevents the cell from bursting when it swells with water. Most plants are multicellular, meaning they are made of many cells. These cells organize into specialized tissues. For example, vascular tissue includes xylem and phloem. These act like internal transport systems to move water and nutrients.

The biological structure of a plant includes several vital organs. Roots are designed to absorb water and minerals from the soil. Stems provide physical support and transport synthesized molecules throughout the organism. Leaves serve as the primary sites for photosynthesis. Flowers are specialized organs used for reproduction.

Plants reproduce through two main methods: sexual and asexual. Sexual reproduction involves a complex lifecycle called alternation of generations. This process moves between a diploid sporophyte stage and a haploid gametophyte stage.

Asexual reproduction allows a plant to grow new individuals from structures like runners, tubers, or bulbs. This creates genetic clones of the parent plant.

Our understanding of plants has changed significantly over many centuries. In ancient times, Aristotle classified all living things into two groups: plants and animals. He believed plants possessed a "vegetative soul." Later, the scientist Linnaeus developed a modern classification system. He called the plant kingdom Vegetabilia. Today, scientists use genome sequencing to define plant groups more accurately. We now recognize the clade Viridiplantae, which includes green algae and land plants. This group contains many different types, such as mosses, ferns, conifers, and flowering plants.

The evolutionary history of plants began in the water. Fossil evidence suggests multicellular freshwater eukaryotes existed over 1,000 million years ago. The first true land plants appeared around 450 million years ago during the Ordovician period. By the Devonian period, plants had developed basic features like roots and leaves. During the Carboniferous period, massive forests of clubmosses and horsetails dominated swampy areas. The first seed plants, known as early gymnosperms, also appeared during this time. Later, flowering plants emerged around 200 million years ago during the Triassic. This led to a rapid radiation of species during the Cretaceous period.

There is immense diversity within the plant kingdom. There are approximately 382,000 accepted species of plants. The vast majority, about 283,000 species, are seed-producing plants. Flowering plants are particularly successful, making up 85% to 90% of all species. Plants vary wildly in scale. Some, like desmids, are only 10 micrometres across. Others are massive, such as the Sequoia sempervirens, which can reach 120 metres in height.

These plants are essential to Earth's life support systems. They release a large portion of the world's molecular oxygen. They also create the sugars that power most global ecosystems.

Humans have a deep and ancient connection to plants. We have domesticated plants for millennia to provide grain, fruit, and vegetables. Beyond food, plants are vital for many industries. They provide materials for building, ornaments for decoration, and fibers for writing. Plants are also a massive source of diverse medicines. The scientific study of these organisms is called botany, which is a major branch of biology. By studying plant genomes, scientists can learn how they resist diseases or survive environmental stress. This knowledge helps us understand the complex systems that sustain life on our planet.