Plant and animal cells are both eukaryotic cells, meaning their DNA is enclosed within a nucleus and their internal functions are divided among specialized structures called organelles. At a basic level, they share the same cellular machinery: both have a cell membrane, nucleus, cytoplasm, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, and other components.
The major differences arise from how plants and animals live. Plants make their own food through photosynthesis and generally remain rooted in place, while animals obtain nutrients by consuming other organisms and typically need cells specialized for movement, communication, and rapid changes in shape. These differences are reflected in cell structure.
What plant and animal cells have in common
Because both plants and animals are eukaryotes, their cells share a fundamental organizational plan. A cell membrane surrounds the cell and regulates what enters and leaves. Inside it, the cytoplasm contains organelles suspended in a watery environment called the cytosol.
The nucleus contains most of the cell’s DNA and regulates gene expression, helping control cellular activities. Ribosomes build proteins according to instructions encoded by RNA. Mitochondria carry out most of the cell’s aerobic cellular respiration, producing ATP, the main immediately usable energy currency of the cell.
Both types of cells also contain an endoplasmic reticulum (ER). Rough ER, which is studded with ribosomes, helps produce and process proteins destined for secretion or certain cellular membranes. Smooth ER is involved in lipid production and other functions. The Golgi apparatus modifies, sorts, and packages proteins and lipids for delivery to different destinations.
The similarities are important because plant and animal cells are not fundamentally unrelated systems. They inherited much of their cellular architecture from common eukaryotic ancestors.
The main differences between plant and animal cells
The easiest way to understand the distinction is to connect each structural difference to a biological function.
| Feature | Plant cell | Animal cell |
|---|---|---|
| Cell membrane | Present | Present |
| Nucleus | Present | Present |
| Cell wall | Present, mainly made of cellulose | Absent |
| Chloroplasts | Present in photosynthetic plant cells | Absent |
| Large central vacuole | Usually present | Usually absent |
| Mitochondria | Present | Present |
| Ribosomes | Present | Present |
| Endoplasmic reticulum | Present | Present |
| Golgi apparatus | Present | Present |
| Typical shape | Often more rigid and regular | Often more flexible and variable |
| Centrioles | Generally absent from most higher plant cells | Commonly present in animal cells |
| Lysosomes | Lytic vacuoles perform many comparable digestive functions | Commonly present |
These distinctions are general rather than absolute. Not every plant cell contains chloroplasts, for example. Root cells typically do not because they are not exposed to light and do not perform photosynthesis. Likewise, animal cells can contain specialized structures that are absent from many other animal cell types.
The cell wall gives plant cells structural support
One of the most obvious differences is the cell wall. Plant cells have a rigid layer outside the cell membrane, composed primarily of cellulose along with other polysaccharides and proteins.
The cell wall helps maintain the cell’s shape and protects it from mechanical stress. It also allows plant cells to withstand the uptake of water without simply expanding until the cell membrane ruptures.
Animal cells do not have cell walls. Their outer boundary is a flexible cell membrane supported by interactions with the cytoskeleton and, in tissues, with the extracellular matrix. This arrangement allows animal cells to change shape more readily and contributes to the wide variety of cell forms found in animals.
Plant cell walls are not simply inert shells. Adjacent plant cells can communicate through microscopic channels called plasmodesmata, which cross their cell walls and allow certain substances and signals to move between cells.
Chloroplasts allow plant cells to capture light energy
Photosynthetic plant cells contain chloroplasts, organelles surrounded by a double membrane. Chloroplasts contain chlorophyll and other pigments that absorb light energy.
Inside a chloroplast, photosynthesis converts light energy into chemical energy. Ultimately, carbon dioxide and water are used to produce carbohydrates, while oxygen is released as a byproduct of the light-dependent reactions.
Chloroplasts are therefore central to the way plants acquire energy and carbon. Animal cells do not contain chloroplasts and cannot perform photosynthesis.
There is an important qualification: not all plant cells contain chloroplasts. Cells in green leaves are rich in chloroplasts because photosynthesis is a major function there. Cells deep in roots, for example, generally lack them. Some plant tissues also contain other types of plastids with different functions.
Chloroplasts and mitochondria share another notable feature: both contain their own DNA and ribosomes and are surrounded by two membranes. This is consistent with the endosymbiotic theory, which proposes that these organelles evolved from ancient bacteria that entered into mutually beneficial relationships with ancestral eukaryotic cells.
The large central vacuole is a defining feature of many plant cells
A mature plant cell often contains a very large central vacuole surrounded by a membrane called the tonoplast. The vacuole can occupy much of the cell’s internal volume.
Rather than functioning as a simple storage container, the central vacuole performs several jobs. It can store water, ions, pigments, metabolites, and other substances. It also helps regulate the cell’s internal water balance.
The vacuole contributes to turgor pressure, the pressure produced when water inside the cell pushes against the cell wall. Turgor helps keep many nonwoody plant tissues firm. When plant cells lose substantial amounts of water, they can lose turgor and the tissue may wilt.
Animal cells also contain membrane-bound vesicles and, in many cell types, smaller vacuoles, but they generally do not have one enormous central vacuole occupying most of the cell.
Why plant cells tend to look more rigid than animal cells
When plant and animal cells are viewed under a microscope, plant cells often appear boxier or more regular. The cell wall largely explains this appearance.
The wall constrains the cell’s shape, while the large central vacuole and internal pressure help maintain its structure. Neighboring plant cells are also physically integrated into tissues.
Animal cells lack this rigid outer wall. Their shapes can therefore vary dramatically depending on their function. A neuron can have long extensions, a red blood cell has a distinctive flexible disc shape, and muscle cells are elongated.
This difference should not be overstated. Plant cells are not all rectangular, and animal cells are not all rounded. Cell shape is ultimately determined by the combination of cellular architecture, cytoskeletal organization, mechanical forces, and specialized function.
Mitochondria occur in both plant and animal cells
It is a common misconception that plants get their energy from chloroplasts while animals get their energy from mitochondria. In reality, plant cells have mitochondria too.
Chloroplasts capture light energy and use it to produce energy-rich organic molecules during photosynthesis. Mitochondria then participate in cellular respiration, extracting usable energy from organic molecules to produce ATP.
Photosynthesis and cellular respiration are therefore connected but distinct processes. A plant cell can make organic molecules using light energy and also break down organic molecules to obtain ATP.
Animal cells lack chloroplasts, so they depend on organic nutrients obtained from food as their source of chemical energy. Their mitochondria convert energy stored in those molecules into forms the cell can use.
Plant and animal cells differ in their digestive compartments
Animal cells commonly contain lysosomes, membrane-bound organelles containing enzymes that break down proteins, lipids, nucleic acids, and other materials.
Plant cells also need to digest and recycle cellular material, but many of these functions are handled by vacuoles, particularly lytic vacuoles. These compartments contain enzymes and can participate in the breakdown and recycling of cellular components.
For this reason, the simple statement that “animal cells have lysosomes and plant cells do not” is an oversimplification. Both kinds of cells possess intracellular digestive and recycling systems, but their organization differs.
Centrioles are another common point of comparison
Animal cells commonly contain centrosomes with centrioles, cylindrical structures involved in organizing microtubules. Centrosomes play important roles in organizing the cytoskeleton and establishing the spindle apparatus during cell division.
Most higher plant cells do not contain centrioles. They nevertheless organize their microtubules and form a spindle during cell division using other mechanisms.
This is another example of why cell diagrams should not be treated as universal blueprints. Textbook diagrams emphasize characteristic structures, but real cells contain variations depending on the organism and cell type.
Plant cells communicate differently from animal cells
Cells need to communicate with one another to coordinate growth, metabolism, development, and responses to their environment.
Plant cells can communicate directly through plasmodesmata, channels that pass through their cell walls and connect neighboring cells. These channels provide pathways for the movement of selected molecules and signals.
Animal cells use several forms of cell-to-cell communication. Some animal cells are connected by gap junctions, which allow ions and small molecules to pass directly between neighboring cells. Animal cells also communicate through chemical signals released into the extracellular environment and through specialized receptors on their surfaces.
The underlying principle is the same: multicellular organisms require mechanisms that allow individual cells to coordinate their activities.
Their differences reflect different ways of living
The structural differences between plant and animal cells make more sense when viewed as adaptations to different biological lifestyles.
Plants generally remain anchored in one location and must obtain energy and raw materials from their surroundings. Their cells therefore benefit from rigid walls, extensive water storage, and specialized organelles for photosynthesis.
Animals generally need cells capable of changing shape, moving, sensing their surroundings, and coordinating rapid physiological responses. Flexible cell membranes, extensive cytoskeletal systems, and specialized tissue structures support these requirements.
Neither cell type is simply a more complicated version of the other. They represent different solutions to the challenges of living as multicellular organisms.
A useful way to remember the comparison
The most important distinction is not a list of organelles but the relationship between structure and function.
Plant cells typically combine a cell wall for support, chloroplasts for photosynthesis, and a large central vacuole for storage and water balance. Animal cells lack those three characteristic features and instead rely on a flexible cell membrane, extracellular structures, and specialized organelles and tissues suited to animal physiology.
At the same time, both remain recognizably eukaryotic cells. The nucleus, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, cytoskeleton, and cell membrane illustrate how much fundamental cellular machinery plants and animals share. Understanding both the similarities and the differences provides a clearer picture of how cell structure supports the diverse ways organisms survive and function.
