Plants are one of the main forms of life, including trees, shrubs, vines, grasses, ferns, green algae, lichens and other familiar creatures. Plants can be divided into seed plants, bryophytes and ferns. It is estimated that there are about 350,000 existing species.
Most of the energy of green plants is obtained from sunlight through photosynthesis, and temperature, humidity, light and fresh water are the basic needs of plant survival.
Angiosperms have six organs: roots, stems, leaves, flowers, fruits and seeds. Green plants have the ability of photosynthesis-with the help of light energy and chlorophyll, under the catalysis of enzymes, water, inorganic salts and carbon dioxide are used for photosynthesis, releasing oxygen and producing organic substances such as glucose for plants to use.
Definition:
In nature, all living things belong to living things. Organisms should be divided into several realms. Organisms that can survive and feed themselves are called plant realms, which are called plants for short.
Plants have obvious cell walls and nuclei, and the cell walls are composed of glucose polymer-cellulose. Plants have the ability of photosynthesis, that is, they can produce food by using water, minerals and carbon dioxide with the help of light energy and chlorophyll that animals do not have.
After releasing oxygen, glucose, an energy-rich substance, remains as a component of plant cells. Aristotle divided living things into two kinds: plants are usually motionless and animals (often move to get food). In the Linnaeus system, it is divided into two fields: plant kingdom and animal kingdom.
Later, people gradually understood that the original definition of the plant kingdom included several unrelated groups, which moved fungi and several algae to a new realm. However, whether professionals or the general public, there are still many views on plants. In fact, if you try to put plants into a single category perfectly, there will be problems.
Because for most people, the word "plant" is not very clear about the relationship between phylogenetic concepts based on current taxonomy and systematics. Plant propagation methods mainly include layering, rameting, cutting, grafting, seeds, spores and so on.