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Free labelled science diagrams for teaching and revision, each with an unlabelled version, a printable worksheet and answer key, a quiz and cited facts. Free under CC BY 4.0; open any of them in LabCanvas to edit.

Free science diagrams

Labelled plant cell diagram: a box-shaped cell showing the cell wall with plasmodesmata, cell (plasma) membrane, cytoplasm, nucleus with nucleolus and nuclear envelope, rough ER, smooth ER, Golgi apparatus, ribosomes, mitochondrion, peroxisome, chloroplasts with grana, and a large central vacuole bounded by the tonoplast.
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Plant cell diagram

Free labelled plant cell diagram with 16 parts, an unlabelled version and a printable worksheet. Learn what each organelle does. SVG, PNG and PDF.

Labelled animal cell diagram: a rounded cell showing the plasma membrane, cytoplasm, nucleus with nucleolus and a nuclear envelope with pores, rough ER, smooth ER, Golgi apparatus, vesicles, mitochondria, lysosome, peroxisome, centrosome with two centrioles, cytoskeleton fibres and ribosomes.
Labelled diagramWorksheet and quiz

Animal cell diagram

Free labelled animal cell diagram with 15 parts, an unlabelled version and a printable worksheet. Learn what each organelle does. SVG, PNG and PDF.

Labeled diagram of a section of cell membrane (fluid mosaic model) with extracellular fluid above and cytoplasm below. Labels: extracellular fluid, carbohydrate chain, glycoprotein, glycolipid, channel protein, cholesterol, peripheral protein, integral protein, cytoskeleton filaments, cytoplasm, hydrophobic tails, phospholipid bilayer and hydrophilic head.
Labelled diagramWorksheet and quiz

Cell membrane diagram

Free labeled cell membrane diagram (fluid mosaic model): phospholipid bilayer, proteins, cholesterol, glycocalyx. Download labeled, unlabeled and blank.

Labeled diagram of a mitochondrion in longitudinal section. Labels: outer membrane, intermembrane space, inner membrane, cristae, ATP synthase, matrix, mitochondrial DNA and ribosomes.
Labelled diagramWorksheet and quiz

Mitochondria diagram

Free labeled mitochondria diagram: outer and inner membrane, cristae, matrix, intermembrane space, ATP synthase, mtDNA. Labeled, unlabeled and blank.

Labeled diagram of mitosis in an animal cell with two homologous chromosome pairs (maternal red, paternal blue). Seven cells show interphase (chromatin, nucleolus), prophase (chromosome, centrosome), prometaphase (spindle fibres, nuclear envelope fragments), metaphase (metaphase plate), anaphase, telophase (nuclear envelope, cleavage furrow) and cytokinesis (daughter cells), with an enlarged chromosome showing sister chromatids and the centromere.
Labelled diagramWorksheet and quiz

Mitosis diagram

Free labeled mitosis diagram: interphase, prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis, plus a blank worksheet and quiz.

Labeled diagram of meiosis with two homologous chromosome pairs (maternal red, paternal blue). Meiosis I: prophase I (tetrad, crossing over, nuclear envelope), metaphase I (homologous chromosomes on the metaphase plate), anaphase I (spindle fibres, centrosome) and telophase I (cleavage furrow). Meiosis II: prophase II, metaphase II (sister chromatids), anaphase II and telophase II, ending in four haploid daughter cells with swapped chromosome segments.
Labelled diagramWorksheet and quiz

Meiosis diagram

Free labeled meiosis diagram showing meiosis I and II, crossing over, homologous pairs and four haploid cells, with a blank worksheet and quiz.

Labelled cell cycle diagram drawn as a wheel: interphase with G1 phase, S phase and G2 phase takes most of the circle, and the M phase with mitosis and cytokinesis a smaller arc, with arrows showing the direction. G0 phase branches off G1. Stop signs mark the G1/S checkpoint, G2/M checkpoint and spindle checkpoint. Small sketches show a cell growing, DNA replicating, a cell preparing to divide, chromosomes lined up on the spindle and the cytoplasm dividing.
Labelled diagramWorksheet and quiz

Cell cycle diagram

Free labelled cell cycle diagram: interphase (G1, S, G2), mitosis, cytokinesis, G0 and the three checkpoints. Download SVG, PNG or a printable worksheet.

Labelled diagram of the human ear in section, divided into outer ear, middle ear and inner ear. Labels: pinna (auricle), external auditory canal, tympanic membrane (eardrum), malleus, incus, stapes, middle ear cavity, Eustachian tube, oval window, round window, semicircular canals, vestibule, cochlea and vestibulocochlear nerve.
Labelled diagramWorksheet and quiz

Ear diagram

Free labelled ear diagram: outer, middle and inner ear, from pinna and eardrum to ossicles, cochlea and semicircular canals. SVG, PNG and worksheet.

Labelled diagram of the human digestive system seen from the front, with the head in side view: mouth, tongue, salivary glands, pharynx, oesophagus, liver, gallbladder, stomach, pancreas, duodenum, small intestine, large intestine (colon), cecum, appendix, rectum and anus.
Labelled diagramWorksheet and quiz

Digestive system diagram

Free labelled digestive system diagram with 16 organs, an unlabelled version and a printable worksheet. Learn what each organ does. SVG, PNG and PDF.

Labelled diagram of a human heart in frontal section, seen from the front: superior and inferior vena cava, right atrium, tricuspid valve, right ventricle, chordae tendineae, papillary muscle, pulmonary valve, pulmonary artery, pulmonary veins, left atrium, mitral (bicuspid) valve, left ventricle, interventricular septum, aortic valve and aorta, with blue arrows for deoxygenated blood and red arrows for oxygenated blood.
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Heart diagram

Free labelled heart diagram with chambers, valves and blood vessels, plus an unlabelled version and a printable worksheet. SVG, PNG and PDF.

Labelled diagram of the human eye in side section: eyelids lined by the conjunctiva, cornea, anterior chamber filled with aqueous humour, pupil, iris, lens held by suspensory ligaments from the ciliary body, sclera, choroid, retina with the fovea (macula), optic disc (blind spot), optic nerve and the vitreous humour filling the inside of the eyeball.
Labelled diagramWorksheet and quiz

Human eye diagram

Free labelled diagram of the human eye with 15 parts, an unlabelled version and a printable worksheet. Learn what each part of the eye does. SVG, PNG, PDF.

Labelled diagram of a multipolar motor neuron: branched dendrites around the cell body (soma) with its nucleus, the axon hillock, an axon wrapped in a myelin sheath made by Schwann cells with gaps called nodes of Ranvier, and branched axon terminals ending in synaptic knobs, with an arrow showing the direction of the nerve impulse.
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Neuron diagram

Free labelled neuron diagram with 9 parts of a motor neuron, an unlabelled version and a printable worksheet. Learn what each part does. SVG, PNG, PDF.

Labelled diagram of a compound light microscope in side view: eyepiece (ocular lens), body tube, arm, coarse focus knob, fine focus knob, base, revolving nosepiece, objective lenses (4x, 10x and 40x), stage clips holding a slide, stage, condenser, iris diaphragm and illuminator, with the light path shown running up through the specimen.
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Microscope diagram

Free labelled compound light microscope diagram with 13 parts and functions, an unlabelled version and a printable worksheet. SVG, PNG and PDF.

Labelled water cycle diagram: the sun heats the ocean and water vapour rises by evaporation; transpiration rises from trees and sublimation from a snow-capped mountain; condensation forms clouds that the wind carries inland; precipitation falls on the mountains; surface runoff flows to the sea, infiltration soaks down to the water table, groundwater flow returns to the ocean, and collection happens in the ocean.
Labelled diagramWorksheet and quiz

Water cycle diagram

Free labelled water cycle diagram: evaporation, transpiration, condensation, precipitation, runoff, infiltration and more. Unlabelled and worksheet too.

Labelled photosynthesis diagram: a chloroplast in cross-section showing the outer membrane, inner membrane, stroma, grana of thylakoids with their lumen, stroma lamellae, chloroplast DNA and ribosomes. Light and water enter the light-dependent reactions on the thylakoids, which release oxygen and pass ATP and NADPH to the Calvin cycle in the stroma; the Calvin cycle takes in carbon dioxide, gives out sugar and returns ADP + Pi and NADP+. The overall equation 6CO2 + 6H2O to C6H12O6 + 6O2 is shown in the corner.
Labelled diagramWorksheet and quiz

Photosynthesis diagram

Free labelled photosynthesis diagram: chloroplast parts, light-dependent reactions and Calvin cycle, plus an unlabelled version and a worksheet.

Labelled DNA structure diagram: on the left a right-handed double helix with its sugar-phosphate backbones, base pairs, a nitrogenous base and the major and minor grooves; on the right a flattened ladder section showing phosphates, deoxyribose sugars, the bases adenine, thymine, guanine and cytosine paired A-T and G-C, the hydrogen bonds between them (two for A-T, three for G-C), and the 5' and 3' ends of the antiparallel strands.
Labelled diagramWorksheet and quiz

DNA structure diagram

Free labelled DNA structure diagram: double helix and ladder with backbone, bases, hydrogen bonds, 5' and 3' ends and grooves. Plus a worksheet.

Labelled bacterial cell diagram: a rod-shaped bacterium showing the capsule, cell wall, plasma membrane, cytoplasm, nucleoid (DNA), plasmids, 70S ribosomes, an inclusion body, many short fimbriae, a long pilus and a flagellum anchored in the cell envelope.
Labelled diagramWorksheet and quiz

Bacterial cell diagram

Free labelled bacterial (prokaryotic) cell diagram with 11 parts, an unlabelled version and a printable worksheet. Learn what each part does.

Labelled virus diagram in two panels. Left: cross-section of an enveloped virus showing spike glycoproteins, the lipid envelope, a layer of matrix protein, a capsid made of capsomeres and the RNA genome. Right: a bacteriophage showing the head (capsid) containing phage DNA, the tail sheath, the base plate and the tail fibres.
Labelled diagramWorksheet and quiz

Virus diagram

Free labelled virus diagram: an enveloped virus and a bacteriophage with 11 parts, an unlabelled version and a printable worksheet with answers.