Zoology catalogue
44 published interactive labs from the NEET syllabus. Search a topic or start with the chapter in front of you.
Molecular Basis of Inheritance
Open the replication fork, run both polymerases, join the Okazaki fragments, then wind the daughters. Six NEET-style practice questions along the way.
Start lessonBiotechnology: Principles and Processes
Heat the DNA, bind the primers, run Taq polymerase, then 30 cycles. Six NEET-style practice questions along the way.
Start lessonCell: The Unit of Life
Explore the 3D structure of a mitochondrion — the powerhouse of the cell. Click the outer membrane, inner membrane, cristae, matrix, and ATP synthase to learn NEET-relevant facts. Switch to ATP Counter mode and adjust demand to see how cristae density affects ATP output.
Cell: The Unit of Life
Cut open a 3D animal cell and click all 14 parts NCERT labels in Fig. 8.3(b) — nucleus, nucleolus, nuclear envelope, rough and smooth ER, Golgi, lysosome, peroxisome, mitochondrion, ribosomes, centriole, microvilli, plasma membrane and cytoplasm. Fly inside the cut, then switch to Spot it and find each organelle from a one-line clue.
Neural Control and Coordination
Step inside a synaptic terminal. Drag the firing-stage slider through Rest, Ca²⁺ Influx, and Release. Watch vesicles dock, fuse, and pour neurotransmitters across the cleft to light up the post-synaptic receptors.
Neural Control and Coordination
Rotate a real human brain and tap any part to learn what it does — the four cerebral lobes, the cerebellum and the brainstem. Built from a real anatomical model, colour-coded by region.
Neural Control and Coordination
Sab bolte hain 'cochlea sound detect karta hai' — par pitch kaise alag hota hai, wo mechanism kabhi dikhta nahi. Is lab mein cochlea ko UNROLL karke ek piano bana diya hai: frequency dial ghumao aur travelling-wave peak basilar membrane par walk karta hai — base par treble, apex par bass. Saath mein middle ear ka lever chain (malleus → incus → stapes), round window ka antiphase bulge, aur organ of Corti ka cross-section — sab exact NCERT physiology ke saath.
Neural Control and Coordination
Is 3D lab mein neuron ko asal 3D anatomy ke saath explore karo: dendrites information receive karte hain, soma cell body hai, aur axon impulse ko body se door carry karta hai. Separate view mein layers alag hote hain, Section view mein internal structure dikhta hai, aur synapse stop dono neurons ke beech one-way handoff dikhata hai. Aage nerve bundle aur brain-spinal cord ke saath CNS-PNS division samajh lo.
Neural Control and Coordination
Is 3D lab mein fingertip receptor se spinal cord, interneuron, motor neuron aur biceps tak reflex impulse ko step-by-step trace karo. Grey matter, white matter, dorsal root ganglion, mixed spinal nerve aur ventral root ko true 3D mein dekho. Phir visceral nervous system ke sympathetic aur parasympathetic two-neuron chains compare karo: sympathetic ganglion spinal cord ke paas hai, jabki parasympathetic ganglion heart ke paas ya organ ki wall mein hota hai.
Neural Control and Coordination
Resting potential se Na+ influx, K+ efflux, Na+/K+ pump aur myelinated axon ka saltatory conduction ek hi 3D lab mein samajho. Spike chalao, nodes of Ranvier par regeneration dekho, myelin on/off karke conduction compare karo, aur 3 Na+ out : 2 K+ in wala ATP-powered exchange inspect karo.
Structural Organisation in Animals
Rebuild a 3D tissue block for every type of epithelium — simple squamous, cuboidal, columnar, pseudostratified, unicellular (goblet) and multicellular (acinus) glandular, stratified and transitional. Click a type to see NCERT-correct cell shape, nucleus shape and position, and the basement membrane that is always present beneath every epithelium.
Structural Organisation in Animals
Frog ka chapter ratne se nahi, kholne se yaad hota hai. Is lab me frog ko ghumao, phir kholo: short alimentary canal, teen chambers wala heart, lungs, kidneys, aur sab kuch ek hi CLOACA me khulta dikhega. Male aur female toggle karke dekho — male me ureter hi urinogenital duct hai, female me ureter aur oviduct alag-alag cloaca me khulte hain. Har organ tap karke bahar nikalo.
Structural Organisation in Animals
Char basic animal tissues ko asli 3D samples mein compare karo: closely packed epithelial sheet, matrix mein scattered connective cells, striated aur non-striated muscle fibres, aur branching neurons with synapses. Scene ko rotate karke free surface, basement membrane, extracellular matrix aur cell arrangement dekhna; phir specific intestinal-wall example mein tissues ke structural roles ko relate karna.
Breathing and Exchange of Gases
Watch a 3D thorax breathe. Pick normal inhalation, normal exhalation, forceful inhalation or forceful exhalation and see the diaphragm flatten, the ribs and sternum swing up, the antero-posterior diameter grow, the lungs inflate and air stream in and out — with the diaphragm, external and internal intercostals and accessory muscles colour-coded by which ones are working.
Breathing and Exchange of Gases
Systemic tissue capillary se oxygen aur carbon dioxide ke transport ko 3D RBC, haemoglobin, carbonic anhydrase aur chloride shift ke saath samjho. Stepper se gas exchange, haemoglobin ke four haem sites, intracellular CO₂ conversion aur bicarbonate-chloride movement ko ek hi visual lesson mein explore karo.
Breathing and Exchange of Gases
Ek alveolus ko true 3D mein kholo, respiratory membrane ki layers dekho aur O2 aur CO2 ke partial-pressure gradients ko frozen stepper se padho. Model alveolar air, oxygenated blood, deoxygenated blood aur tissue cells ke PO2/PCO2 readings compare karta hai. Particle exchange dikhata hai ki O2 104 se 40 mmHg aur CO2 45 se 40 mmHg direction mein diffusion karta hai. Ventilation control se dekho ki alveolar gases pehle badalti hain, jabki blood aur tissue readings turant alveolar ke equal nahi ho jaatin.
Locomotion and Movement
Sab kehte hain 'muscle contract hoti hai to filaments short ho jaate hain' — galat. Actin aur myosin apni exact length rakhte hue bas ek dusre ke upar SLIDE karte hain, aur isi ka naam hai sliding filament theory. Is lab me ek real 3D sarcomere hai jiska contraction slider tum khud ghumaoge, aur neeche teen live rulers pinned hain: A band (jo KABHI nahi badalta), I band aur H zone (jo saamne saamne collapse hote hain). Ek alag stepper ek myosin head ko uske 4 frozen stages me zoom karta hai — site exposure se lekar ATP-detach tak. Aur haan, Ca²⁺ toggle off karo aur dekho sarcomere kaise relax ho jaata hai — kyunki ATP detachment ke liye chahiye, attachment ke liye nahi.
Locomotion and Movement
Is 3D lab mein skeletal muscle fibre ko section mein kholo, sarcomere ke Z lines, actin aur myosin filaments samjho, phir cilia aur flagellum ka typical 9+2 axoneme compare karo. Animated movement stops par dikhate hain ki muscular movement contraction se, ciliary movement oar-like beating se aur flagellar movement whip-like motion se hoti hai.
Locomotion and Movement
Is 3D atlas me 206-bone adult skeleton ko orbit karo, axial 80 aur appendicular 126 bones ko highlight karke count check karo. Phir fibrous, cartilaginous aur synovial joints ko alag-alag specimens me kholo. Capsule, cartilage, cavity aur ligaments ko side view me dekhna, phir hinge, pivot, ball-and-socket, gliding, saddle, suture aur symphysis ko movement ke hisaab se classify karna.
Human Reproduction
Ek hi starting cell, same do meiotic divisions — par male side 4 sperm milte hain aur female side sirf 1 ovum. Is lab mein dono tracks side-by-side chalti hain ek shared stepper pe, aur orange furrow dikhaata hai ki unequal cytokinesis polar bodies kaise banati hai. Fertilisation toggle ghumao aur dekho ki secondary oocyte metaphase II pe kyun atka rehta hai jab tak sperm enter nahi hota. Timeline strip batati hai ki kya foetal life mein hota hai, kya puberty pe, aur kya sirf fertilisation ke baad.
Human Reproduction
Sabse common galti: 'fertilisation uterus me hota hai.' Nahi — wo fallopian tube ke AMPULLARY region me hota hai, aur uterus tak pahunchte-pahunchte zygote already morula ban chuka hota hai. Is lab me ovum ke saath tube se neeche chalo: sperm zona pellucida pe, zygote, cleavage, morula, blastocyst, aur finally endometrium me implantation. Har stage ko ghumao, khol ke dekho, aur parts alag karke samjho.
Human Reproduction
Ovaries, oviducts, uterus, cervix aur vagina ko ek connected 3D system mein dekho. Frozen cycle stops par Graafian follicle, LH surge, secondary oocyte, corpus luteum aur endometrium ke changes explore karo. Separate view se uterine layers reveal hote hain, opened ovary se follicles dikhte hain, aur hormone curves menstrual control ko visually simplify karte hain.
Human Reproduction
Implantation se placenta formation tak ka structure 3D mein dekho. Chorionic villi aur uterine tissues milkar placenta banate hain, maternal aur foetal blood normally separate rehti hai, aur umbilical cord mein 2 arteries plus 1 vein hote hain. Model ko alag karke layers samjho ya section view se amniotic cavity aur exchange pathway dekho.
Human Reproduction
Parturition ko ek frozen 3D sequence mein dekho: vertex foetus, cervix stretch, maternal pituitary signal, oxytocin-driven positive feedback aur full dilatation. Iske baad prolactin milk formation aur oxytocin milk ejection ko alag-alag dikhate hain. Breast section mein lobules, alveoli, ducts aur nipple hain; nipple drag karke let-down trigger kar sakte ho. Colostrum ko first-feed, yellowish aur IgA-rich state mein compare karke passive immunity samajh sakte ho.
Animal Kingdom
Animal ko slice karo aur layers GIN lo — bas yahi Animal Kingdom ka sabse scoring skill hai. Is lab mein ek 3D body hai jiska cut face acoelomate, pseudocoelomate aur coelomate plans mein rebuild hota hai, aur ek live readout batata hai: mesoderm dono sides line kar raha hai ya nahi. Symmetry view mein mirror planes drop karo aur dekho radial mein saare pass hote hain, bilateral mein sirf ek. Diploblastic-triploblastic toggle se poori germ-layer picture clear.
Animal Kingdom
Planaria, Taenia, Ascaris aur earthworm ko same 3D lesson mein compare karo. Har specimen ko rotate, section aur separate karo, taaki tissue-filled acoelom, incompletely mesoderm-lined pseudocoelom aur septa-divided true coelom ka difference clearly dikhe. Model Planaria ka ventral surface par located mouth, incomplete branched gut aur flame cells, Taenia ka absent gut, Ascaris ka complete gut aur molting cuticle, aur earthworm ke 100–120 short segments mein se 12 segments ka representative part dikhata hai.
Animal Kingdom
Arthropoda ke saath ek true 3D Palaemon prawn explore karo: segmented body, tagmata, jointed appendages, gills, green glands, dorsal heart aur ecdysis ko frozen lesson steps mein dekho. Legs aur antennae separate karke anatomy check karo, carapace kholo, section view mein internal organs dekho, aur moulting ke dauran purani cuticle ke shed hone ko visually samjho.
Animal Kingdom
Teen foundational animal phyla ko asli 3D form mein compare karo: Porifera ka canal system, Hydra ke ectoderm-endoderm aur nematocyst battery, aur Ctenophore ke aath comb rows. Stopper par frozen anatomy dekho, layers separate karo, sponge ke pores click karke water flow trace karo aur tentacle se stinging thread discharge karo.
Animal Kingdom
Asterias starfish ko rotate karke uske true 3D central disc, five tapering arms, calcareous mesodermal ossicle endoskeleton, spines aur ambulacral grooves explore karo. Stepper adult pentaradial symmetry se bilaterally symmetrical bipinnaria larva tak le jata hai, phir seawater ke madreporite se ring canal, 5 radial canals, transverse canals, lateral canals aur tube feet tak ka flow dikhata hai. Separate karne se endoskeleton aur soft tissue alag hote hain, jabki hydraulic tube feet ka ek step cycle extension, adhesion aur retraction se samajh aata hai.
Human Health and Disease
Antibody ko flat Y samajhna band karo — ye four peptide chains ka globular 3D molecule hai. Do heavy aur do light chains ko ghumao, variable tips par antigens bind karao, S–S bonds dekho, phir H₂L₂ assembly ko kholkar reassemble karo.
Human Health and Disease
Is lab me immune response ko barrier se phagocyte, lymphocyte aur antibody tak 3D me trace karo. Bone marrow me B cells, thymus me T cells, lymph node me antigen encounter, humoral immunity, cell-mediated immunity, allergy aur autoimmunity ko frozen lesson steps me samjho.
Human Health and Disease
HIV aur AIDS ko ek hi cheez mat samjho. Is 3D lab me ek T lymphocyte, HIV particles aur immune-defence cells ko rotate karke dekho; phir stepper se dekho ki T lymphocytes damage hone ke baad immunity kaise weak hoti hai, opportunistic infections kaise paancha paate hain aur advanced disease stage kya hota hai.
Body Fluids and Circulation
In this 3D lab, dekho ki vessel injury par platelet plug kaise banta hai, thromboplastin aur calcium ki madad se coagulation cascade kaise aage badhta hai, aur fibrin mesh blood cells aur platelets ko kaise trap karke clot banata hai. Phir capillary bed mein plasma filter hokar tissue fluid banta hai, venous end par kuch fluid blood mein wapas jaata hai, aur bacha hua fluid colourless lymph vessels mein lymphocytes ke saath venous circulation tak jaata hai.
Body Fluids and Circulation
ECG ko sirf graph mat samjho — ye heart ke electrical activity ka record hai. Is 3D lab mein SA node se impulse ka track karo, AV node ke delay ko dekho, His-Purkinje pathway follow karo aur P, QRS aur T wave ko heart ke conduction phases se match karo.
Body Fluids and Circulation
Blood ko sirf red cells ka pile samajhna incomplete hai. Is 3D lab mein plasma aur formed elements ko alag-alag layers mein dekho, biconcave RBC, nucleated WBC aur coagulating platelet ko close-up mein compare karo, phir ABO antigens, Rh(D) antigen aur transfusion compatibility samjho. Frozen lesson steps aur blood-group controls se antigens aur antibodies ko 3D mein observe karo.
Biomolecules
Protein structure ki chaar levels samjho: linear primary sequence, local alpha-helix aur beta-sheet, ek polypeptide ka complete 3-D conformation, aur multiple subunits ka quaternary assembly. Is 3D lab mein residue beads, peptide backbone, hydrogen bonds, hydrophobic core, example pocket aur haemoglobin ke 2 alpha + 2 beta subunits dekhne layak hain. Sequence edit karke dekho ki ek residue change possible folding constraints ko affect kar sakta hai, bina kisi unique 3-D fold ka guarantee kiye.
Biomolecules
Is 3D lab mein enzyme ka specific active-site cleft, substrate ki compatibility aur activation energy ka qualitative comparison explore karo. Protein ko rotate, separate ya section view mein dekho, phir temperature aur pH ke effects observe karo. Last stop par enzyme ki exactly chah reaction-based classes unke functions ke saath revise karo.
Biotechnology and its Applications
Synthetic A- aur B-chain genes se recombinant plasmid banta hai, jo E. coli ko human insulin ke liye chains banane par force karta hai. 3D lab mein genes, plasmid, bacterial expression, harvest, purification aur teen disulphide bonds se mature insulin assembly ko frozen steps mein dekho. Saare 51 residues model mein count hote hain, aur separate A/B route ko C-peptide removal se clearly alag rakha gaya hai.
Biotechnology and its Applications
Bt cotton me cry gene kaise kaam karta hai, is lab me seedha 3D cotton cell, plant aur insect pest ke through dekho. Pehle cry DNA ke insert ko samjho, phir cotton cell me inactive Bt protoxin ke banne ko trace karo, aur finally insect pest ke alkaline gut me toxin activation aur feeding rukne ko observe karo. Bt ON/OFF control se clear hota hai ki protection introduced toxin protein se aati hai.