Characteristics of Plants
Plants form one of the major kingdoms of life, and while most people can identify a plant on sight, the scientific characteristics that define the group are more specific than "green and rooted in the ground." These traits, taken together, are what botanists actually use to classify an organism as a plant; see Characteristics of Living Organisms for the broader biological criteria all life shares.
Last updated: 8 September 2026
Key characteristics
Cell walls made of cellulose
Plant cells are surrounded by a rigid wall made largely of cellulose, which gives plant tissue its structural support and is a key difference from animal cells, which lack cell walls entirely.
Photosynthetic, autotrophic nutrition
Most plants produce their own food using chlorophyll to convert sunlight, water, and carbon dioxide into glucose and oxygen, rather than consuming other organisms for energy.
Fixed, rooted growth
The large majority of plants grow anchored in one place for their entire life, with roots that both secure them physically and draw water and nutrients from the soil.
Response to stimuli through tropisms
Plants respond to their environment through directional growth responses called tropisms, such as phototropism, growing toward light, and gravitropism, roots growing downward with gravity.
Reproduction by seeds, spores, or vegetative means
Most plants reproduce sexually through flowers and seeds, though many can also reproduce asexually, through runners, bulbs, or cuttings that grow into genetically identical new plants.
Internal transport systems
Vascular plants move water and nutrients through two specialised tissues: xylem, which carries water upward from the roots, and phloem, which distributes the sugars produced by photosynthesis.
Defined life cycles
Plants follow patterns such as annual (completing a life cycle in one growing season), biennial (two seasons), or perennial (living and reproducing across many years), which shapes how they allocate energy over time.
Adaptations to specific environments
Plants show a wide range of structural and physiological adaptations to their habitat, from the water-storing tissue of desert cacti to the floating leaves of aquatic species.
Frequently asked questions
Are all plants photosynthetic?
No, though the large majority are. Some plants, such as dodder and certain orchids, are partly or fully parasitic and obtain some or all of their nutrients from other plants rather than through photosynthesis alone.
What is the main difference between plant cells and animal cells?
Plant cells have a rigid cellulose cell wall and, in photosynthetic tissue, chloroplasts for capturing light energy; animal cells have neither, relying instead on a flexible membrane and, in most cases, obtaining energy by consuming other organisms.
Are fungi classified as plants?
No. Although fungi were historically grouped with plants, modern biology classifies them in their own separate kingdom, since fungi lack chlorophyll and photosynthesis, obtain nutrients by absorption rather than production, and have cell walls made of chitin rather than cellulose.