Class 9 Science · Chapter 3
Short answer:
Class 9 Science Chapter 3 — "Tissues in Action" (NCERT "Exploration" textbook, 2026-27 session) purane "Tissues" chapter ka hi rationalised version hai, plus naya musculoskeletal-system aur joints wala content. Ye tissues in action class 9 notes aur class 9 science chapter 3 ncert solutions dono cover karta hai — plant tissues (meristematic + permanent), animal tissues (epithelial, connective, muscular, nervous), joints, aur tissue culture. Neeche in-text + exercise dono ke step-by-step, marking-scheme-style answers hain.
Chapter 2 "Cell: The Building Block of Life" me tumne padha tha ki har jeev ek ya multiple cells se bana hota hai. Chapter 3 "Tissues in Action" wahi se aage badhta hai — jab similar structure aur function wale cells ek saath team banake kaam karte hain, tab woh group tissue kehlata hai. Ye chapter poori human aur plant physiology ki neev hai; Class 10, 11, 12 me jo bhi organ system (digestive, circulatory, nervous) padhoge, uska starting point yehi samajh hai ki alag-alag tissue kyu alag-alag kaam karte hain.
Naye NCERT book "Exploration" (2026-27 session) me ye chapter purane "Tissues" chapter ka hi rationalised naya avatar hai — core content (meristematic tissue, permanent tissue, xylem-phloem, animal tissues) same hai, bas naam "Tissues in Action" ho gaya hai aur ant me musculoskeletal system + joints + nutrition-exercise ka naya practical-application section jud gaya hai. Isliye chapter ka naam "in Action" hai — sirf structure nahi, function/application pe bhi zor hai.
Agar tumhe pura class 9 science exploration book pdf download karna hai ya class 9 science all chapters notes pdf chahiye toh NCERT ki official site (ncert.nic.in) hi sabse reliable source hai — third-party PDF me aksar purana pre-2023 syllabus mix mil jata hai jisme is naye "Tissues in Action" jaisa restructuring nahi hoga.
Chapter 3 Summary — 5 Minute Revision
Is chapter ka poora structure do bade hisson me bata hai: plant tissues aur animal tissues.
Plant tissues do types ke hain — meristematic (dividing, growth ke liye: apical, lateral/cambium, intercalary) aur permanent (differentiated, dividing nahi karte). Permanent tissue aage simple (parenchyma, collenchyma, sclerenchyma — ek jaisi cells) aur complex (xylem, phloem — alag-alag cell types mil ke ek function karte hain) me bantta hai. Xylem paani/minerals upar le jata hai (mostly dead cells — tracheids, vessels), phloem food le jata hai (mostly living cells — sieve tubes, companion cells).
Animal tissues char main types ke hain — epithelial (covering/lining, protection), connective (tissues ko jodta/support karta hai — areolar, adipose, bone, cartilage, blood, tendon, ligament), muscular (movement — striated/voluntary, unstriated/involuntary, cardiac) aur nervous (neuron — signal carry karta hai).
Naya "in Action" section batata hai ki muscular tissue + bone + joints (fibrous, cartilaginous, synovial) milke musculoskeletal system banate hain, aur balanced nutrition + regular exercise se ye system healthy rehta hai. Tissue culture — lab me tissue se naya plant/organ grow karna — bhi is chapter ka application-based topic hai.
In-Text Questions — Solutions
Tissue kise kehte hain? Multi-cellular organisms me tissue ki utility (upyogita) kya hai?
Tissue: Similar origin, structure aur function wale cells ka woh group jo milke ek specific karya karta hai, tissue kehlata hai.
Utility:
- Division of labour hoti hai — har tissue apna specific kaam karta hai (e.g. muscle tissue movement, nervous tissue signal carrying), isliye organism efficiently function karta hai.
- Cells ko individually apna sara kaam nahi karna padta — energy save hoti hai.
- Damaged tissue ko replace/repair karna aasan hota hai kyunki specific tissue hi affected hota hai, poora organism nahi.
Simple permanent tissue ke kitne types hain? Naam batao aur unme se har ek kahan milti hai.
Simple permanent tissue 3 types ki hoti hai:
- Parenchyma — thin cell wall, living, loosely packed. Milti hai: soft parts jaise stem, root, leaf ka ground tissue, fruit pulp. Storage aur photosynthesis (chlorenchyma) ka kaam karti hai.
- Collenchyma — thick corners (cellulose + pectin), living, flexible support deti hai. Milti hai: leaf stalk (petiole), stem ki peripheral region me, growing parts me.
- Sclerenchyma — thick lignified cell wall, dead cells, koi intercellular space nahi. Milti hai: seed coat, nut shell, vascular bundle ke around, stem me — mechanical strength deti hai.
Stomata ka function kya hai?
Stomata leaf ki epidermis me chote-chote pores hote hain, jinke around do bean-shaped guard cells hoti hain. Inke functions hain:
- Gaseous exchange — O2 aur CO2 ka aana-jaana (photosynthesis aur respiration ke liye).
- Transpiration — pani vapour ke roop me bahar nikalta hai, jisse plant me water/mineral upward movement banti hai.
Guard cells stomata ko khol-band karte hain (turgidity ke hisaab se) taaki excess water loss na ho.
Diagram ke through plant body me meristematic tissue ki location dikhao.
(Labelled diagram book me banao — description neeche di gayi hai jo diagram me label karni hai):
- Apical meristem — root tip aur shoot tip pe (sabse upar/neeche ke growing points) — length badhane ke liye.
- Lateral meristem (cambium) — stem aur root ke andar, side me, vascular bundle ke beech — girth (motai) badhane ke liye.
- Intercalary meristem — mature tissue ke beech me, node ke paas (jaise grass me) — regrowth ke liye, cutting ke baad.
Exam tip: diagram me plant ka outline banao, root tip + shoot tip + stem cross-section pe teeno meristem types ko arrows se correctly label karna zaroori hai — bina label ke marks kat sakte hain.
Ek experiment design karo jisse ye dikhe ki plant ki growth stem ki tip par meristem ki wajah se hoti hai.
Experiment:
- Ek healthy potted plant lo, uski stem par tip se shuru karke har 1 cm par ink se marks lagao (total 5-6 marks, equal distance pe).
- Plant ko normal conditions me kuch din (5-7 din) grow hone do, roz observe karo.
Observation: Sabse tip wali (upar wali) marks ke beech ka distance sabse zyada badhta hai; niche wali marks ka distance almost same rehta hai.
Conclusion: Isse pata chalta hai ki growth mainly stem ke tip par ho rahi hai, kyunki wahan apical meristem present hai jiski cells actively divide hoti hain — isliye tip ke paas wali marks ke beech ki distance sabse zyada badhi.
Cork protective tissue ki tarah kaise kaam karta hai?
Cork (bark) old stems/roots me cork cambium se banta hai. Ye protective tissue is tarah kaam karta hai:
- Cork cells dead hote hain, compactly arranged, koi intercellular space nahi.
- Cell walls me suberin naam ka waxy/waterproof substance deposit hota hai, jo cells ko air-tight (impermeable) bana deta hai.
- Isse plant ko water loss, mechanical injury, temperature extremes aur pathogen entry se protection milti hai — jaise humari skin humein protect karti hai.
Table complete karo — Parenchyma, Collenchyma, Sclerenchyma ko cell wall thickness aur living/dead status ke basis par differentiate karo.
| Tissue | Cell wall | Living/Dead | Intercellular space |
|---|---|---|---|
| Parenchyma | Thin (cellulose) | Living | Present |
| Collenchyma | Thick at corners (cellulose + pectin) | Living | Little/absent |
| Sclerenchyma | Thick, lignified all around | Dead | Absent |
↔ Table ko side me swipe karein
Striated, unstriated aur cardiac muscles ko structure aur location ke basis par differentiate karo.
| Feature | Striated (skeletal) | Unstriated (smooth) | Cardiac |
|---|---|---|---|
| Shape | Long, cylindrical, unbranched | Spindle-shaped, tapering ends | Branched, cylindrical |
| Nucleus | Multi-nucleated | Single (uni-nucleated) | Single |
| Bands/Striations | Present (alternate light-dark bands) | Absent | Present but faint |
| Control | Voluntary | Involuntary | Involuntary |
| Location | Limbs, body wall (skeletal muscles) | Alimentary canal, blood vessels, iris | Heart wall only |
↔ Table ko side me swipe karein
Following ko identify karo: (i) Mouth ki inner lining ki tissue (ii) Muscle ko bone se jodne wali tissue (iii) Plant me food transport karne wali tissue (iv) Body me fat store karne wali tissue (v) Fluid matrix wali connective tissue (vi) Brain me present tissue.
(i) Squamous epithelium (ii) Tendon (a type of dense connective tissue) (iii) Phloem (iv) Adipose tissue (v) Blood (vi) Nervous tissue
Exercise Questions — Solutions (Q1–Q16)
"Tissue" term ko define karo.
Tissue similar cells ka woh group hai jo same origin se bante hain aur milkar ek specific function perform karte hain, taaki multicellular organism efficiently kaam kar sake.
Xylem tissue kitne types ke elements se milkar bani hoti hai? Unke naam batao.
Xylem 4 elements se milkar banta hai:
- Tracheids — dead, elongated, tapering cells.
- Vessels — dead, tube-like, perforated end walls wali cells.
- Xylem parenchyma — living cells, food storage karti hain.
- Xylem fibres — dead, mechanical support dete hain.
Tracheids aur vessels dono water/mineral conduction ka main kaam karte hain aur mechanical support bhi dete hain.
Plants me simple tissue complex tissue se kaise alag hoti hai?
| Simple tissue | Complex tissue |
|---|---|
| Ek hi type ki cells se bani (e.g. parenchyma) | Alag-alag type ki cells se bani (e.g. xylem me tracheid + vessel + parenchyma + fibre) |
| Sab cells same structure/function karti hain | Different cells milkar ek common function (conduction) karti hain |
| Examples: parenchyma, collenchyma, sclerenchyma | Examples: xylem, phloem |
↔ Table ko side me swipe karein
Parenchyma, collenchyma aur sclerenchyma ko unke cell wall ke basis par differentiate karo.
Parenchyma: Cell wall thin aur uniformly thin hoti hai (sirf cellulose).
Collenchyma: Cell wall corners par thick hoti hai (cellulose + pectin ka deposition), rest jagah thin — isse flexibility ke saath support milta hai.
Sclerenchyma: Cell wall uniformly thick hoti hai poori wall me (lignin deposit), isliye cells dead ho jaati hain aur bahut rigid hoti hain.
Stomata ke functions kya hain?
1) Gaseous exchange (O2, CO2) photosynthesis aur respiration ke liye. 2) Transpiration (water vapour release) — jo water/mineral ke upward transport ko drive karta hai. Guard cells inhe khol-band karke water loss control karte hain.
Diagram se plant body me meristematic tissue ki location dikhao.
Root tip aur shoot tip par apical meristem (label karo), stem/root ke andar side me lateral meristem (cambium) (label karo), aur node ke paas intercalary meristem (label karo) — teeno ko ek plant ke outline diagram me correctly arrows se label karna hai.
Ek experiment design karo jisse dikhe ki plant ki growth stem ke tip par present meristem ki wajah se hoti hai.
Stem ki tip se shuru karke equal-distance (1 cm) marks lagao ink se; kuch din grow hone do. Tip ke paas wali marks ke beech distance sabse zyada badhega — isse prove hota hai growth apical meristem (jo tip par hai) ki activity se hoti hai.
Following tissues ke labelled diagram banao: (a) Parenchyma (b) Sclerenchyma (c) Collenchyma.
(Book me hand-drawn diagram banao) — Parenchyma: thin-walled, oval/round, loosely packed cells with intercellular spaces, nucleus label karo. Sclerenchyma: thick lignified wall, narrow lumen, no intercellular space, dead cell label karo. Collenchyma: thickening corners par label karo, living cell with nucleus, elongated shape.
Plants me epidermis ka function kya hai?
Epidermis plant ki outermost protective layer hai — ye water loss (excessive transpiration) rokti hai, mechanical injury aur pathogen entry se protect karti hai, aur roots me root hairs ke through water absorption me help karti hai. Stomata bhi epidermis ka hi part hai jo gaseous exchange control karta hai.
Cork protective tissue ki tarah kaise act karta hai?
Cork cells dead, compact hote hain aur unki wall me suberin (waterproof, waxy substance) deposit hoti hai jo unhe impermeable bana deti hai — isse plant ko water loss, injury aur pathogens se protection milti hai.
Following table complete karo (Cell type ke basis par tissue comparison): No. of cells, Cell shape, Cell wall thin/thick, Function.
| Cell type | Shape | Cell wall | Function |
|---|---|---|---|
| Parenchyma | Round/oval, loosely packed | Thin | Storage, photosynthesis (if chloroplast present) |
| Collenchyma | Elongated, corners thick | Thick at corners only | Flexible mechanical support |
| Sclerenchyma | Long, narrow, tapering | Thick (lignified), uniform | Rigid mechanical strength |
↔ Table ko side me swipe karein
Brain me present tissue ke functions kya hain?
Brain me nervous tissue present hai jo neurons se bana hota hai. Iske functions: (i) body ke different parts se stimuli (signals) receive karna, (ii) electrical impulses ke roop me signal ko rapidly conduct/transmit karna, (iii) response coordinate karna — isliye nervous tissue body ka main control aur communication system hai.
Human body me niche di gayi tissues kahan-kahan milti hain: (i) Cuboidal epithelium (ii) Striated muscle (iii) Smooth (unstriated) muscle (iv) Blood.
(i) Cuboidal epithelium — kidney tubules, salivary gland ducts, thyroid gland me. (ii) Striated muscle — limbs, body wall (skeletal muscles jo bones se attached hoti hain). (iii) Smooth muscle — alimentary canal, blood vessels, iris, urinary bladder. (iv) Blood — poore body me circulatory system (blood vessels aur heart) ke through.
Following ke labelled diagrams banao: (i) Squamous epithelium (ii) Spindle-shaped muscle fibre (iii) Striated muscle fibre (iv) Neuron.
(Book me hand-drawn diagram banao) — (i) Squamous: flat, thin, tile-like cells with centrally placed nucleus. (ii) Spindle-shaped (smooth muscle): tapering ends, single central nucleus. (iii) Striated: cylindrical, multi-nucleated, alternate light-dark bands label karo. (iv) Neuron: cell body (with nucleus), dendrites (branched, input), axon (long, output) with axon terminals — sab label karo.
Joints kitne main types ke hote hain? Har ek ka ek example do.
Joints 3 main types ke hote hain: (i) Fibrous joints — koi movement nahi (e.g. skull ke sutures). (ii) Cartilaginous joints — thoda movement (e.g. vertebrae ke beech ki disc). (iii) Synovial joints — free movement, synovial fluid se lubricated (e.g. knee — hinge joint, shoulder — ball and socket joint).
Balanced nutrition aur regular exercise musculoskeletal system ko healthy rakhne me kaise help karte hain?
Nutrition: Calcium aur Vitamin D bones ko strong rakhte hain; protein muscle tissue repair aur growth ke liye zaroori hai.
Exercise: Regular physical activity muscle strength aur flexibility badhati hai, bone density maintain karti hai, aur joint mobility (synovial fluid production) ko healthy rakhti hai — isse osteoporosis aur muscle weakness ka risk kam hota hai.
Important Equations — Ek Nazar Me
| Category | Type/Sub-type | Key Feature | Location / Function |
|---|---|---|---|
| Meristematic tissue | Apical | Dividing cells, root/shoot tip | Growth in length |
| Lateral (cambium) | Dividing cells, sides of stem/root | Growth in girth (thickness) | |
| Intercalary | Dividing cells, near node | Regrowth after cutting | |
| Simple permanent tissue | Parenchyma | Thin wall, living | Storage, photosynthesis |
| Collenchyma | Thick corners, living | Flexible mechanical support | |
| Sclerenchyma | Thick lignified wall, dead | Rigid mechanical strength | |
| Complex permanent tissue | Xylem | Mostly dead (tracheid, vessel) + living parenchyma | Water/mineral conduction (upward) |
| Phloem | Mostly living (sieve tube, companion cell) + fibres | Food conduction (both directions) | |
| Animal tissue | Epithelial | Tightly packed cells, covering/lining | Protection, absorption, secretion |
| Connective | Cells embedded in matrix | Support, binding, transport (blood) | |
| Muscular | Contractile fibres (striated/unstriated/cardiac) | Movement | |
| Nervous | Neurons — dendrite, cell body, axon | Signal generation and conduction | |
| Joints | Fibrous | No movement | Skull sutures |
| Cartilaginous | Slight movement | Vertebral discs | |
| Synovial | Free movement, synovial fluid | Knee, shoulder, elbow |
↔ Table ko side me swipe karein
Common Mistakes — Yahan Marks Kat te Hain
- Meristematic aur permanent tissue ko ulta samajhna — students bhool jaate hain ki meristematic cells hi divide karti hain (growth), permanent tissue divide nahi karti (differentiated). Yaad rakho: 'meristematic = multiplying, permanent = settled'.
- Apical, lateral aur intercalary meristem ki location confuse karna — apical sirf tip par, lateral sides me (girth), intercalary node ke paas hoti hai. Exam me diagram me galat jagah label karna common galti hai.
- Parenchyma, collenchyma, sclerenchyma ke cell wall thickness ko galat likhna — sclerenchyma ko 'thin wall' ya parenchyma ko 'dead cells' bata dena. Rule: parenchyma thin+living, collenchyma corner-thick+living, sclerenchyma uniform-thick+dead.
- Xylem ke sab elements ko 'dead' ya phloem ke sab elements ko 'living' bol dena — xylem parenchyma living hoti hai (xylem ka exception), aur phloem fibres dead hoti hain (phloem ka exception). In exceptions ko yaad rakhna zaroori hai.
- Striated, unstriated aur cardiac muscle ka voluntary/involuntary control ulta likhna — striated (skeletal) voluntary hoti hai, unstriated (smooth) aur cardiac dono involuntary hote hain, lekin cardiac striated dikhti hai — ye cross-confusion bahut common hai.
- Connective tissue ke different types (areolar, adipose, blood, bone, cartilage, tendon, ligament) ko sirf 'connective tissue' bolke chhod dena, specific naam aur unki matrix (solid/fluid) na batana — specific naam ke bina answer incomplete maana jata hai aur marks kat sakte hain.
Board-Style Important Questions
- Conceptual: Tissue ko define karo.
- Short answer: Xylem aur phloem ke conduction function me kya antar hai? (Direction aur kya conduct karte hain, dono batao)
- Short answer: Parenchyma aur collenchyma ko cell wall ke basis par differentiate karo.
- Long answer: Animal tissue ke char main types kaunse hain? Har ek ka ek example aur location batao.
- Long answer: Striated, unstriated aur cardiac muscle fibres ko structure aur control (voluntary/involuntary) ke basis par differentiate karo.
- Diagram-based: Neuron ka labelled diagram banao aur uske parts (dendrite, cell body, axon) ka function likho.
Aksar Poochhe Jaane Wale Sawaal
Class 9 Science Chapter 3 "Tissues in Action" ke NCERT solutions kahan milenge?
Ye page hi class 9 science chapter 3 ncert solutions deta hai — sab in-text aur exercise questions ke step-by-step answers upar diye gaye hain. Official textbook hamesha NCERT ki site (ncert.nic.in) se hi download karo, kyunki naye "Exploration" book me chapter names/numbering pre-2023 syllabus se different hai.
Class 9 Science ke naye syllabus (2026-27) me total kitne chapters hain aur unke naam kya hain?
Naye class 9 science new syllabus 2026-27 chapter list me total 13 chapters hain, jinme kuch renamed hain — jaise purana "Atoms and Molecules" ab (naye naam ke transition period me) dono naam se search hota hai: atoms and molecules important questions class 9 aur "Atomic Foundations of Matter", aur purana "Structure of the Atom" ab structure of atom class 9 notes ke saath-saath "Journey Inside the Atom" bhi search hota hai. Biology side me "Tissues in Action" (Ch.3) ke baad "Cell: The Building Block of Life" (Ch.2) jaisa hi naye chapters hain — reproduction class 9 ncert solutions aur diversity and classification class 9 important questions naye standalone chapters hain.
Kya Chapter 3 me tissue culture bhi cover hota hai?
Haan, chapter ke end me tissue culture ka basic concept application-based topic ki tarah cover hota hai — plant ke ek chote se tissue piece se lab me nutrient medium par naya poora plant grow karna. Ye meristematic tissue ki dividing property ka hi practical application hai.
Class 9 Science ke baaki chapters (motion, sound, mixtures, earth science) ke notes kahan milenge?
Har chapter ke liye alag detailed notes zaroori hain — jaise class 9 science motion chapter formulas, work energy and simple machines class 9 numericals, class 9 science sound chapter important questions, exploring mixtures and their separation class 9 notes, aur class 9 science earth as a system notes (ye naya Earth Science chapter hai, pehli baar add hua). Ye Chapter 3 ka page sirf Biology ke "Tissues in Action" tak focused hai.
Meristematic tissue aur permanent tissue me sabse simple difference kya hai jo exam me yaad rakhna chahiye?
Sabse simple rule: meristematic tissue cells continuously divide karti hain (isliye growth hoti hai), jabki permanent tissue cells differentiate ho chuki hoti hain aur divide nahi karti (isliye specific function karti hain). Exam me ye ek line likhna bhi partial marks dilata hai agar poora answer yaad na ho.
Cell chapter (Chapter 2) aur Tissues in Action (Chapter 3) ka connection kya hai?
Chapter 2 me single cell ki structure/organelles padhte hain (cell the building block of life class 9 questions jaise topics), aur Chapter 3 me wahi cells jab similar function ke liye group banati hain, tab tissue banta hai. Isliye Chapter 3 samajhne se pehle Chapter 2 ki basic cell structure clear honi chahiye — dono chapters directly linked hain.
Class 9 Science — Saare Chapters
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