Class 7 Science · Chapter 9
Short answer: Chapter 9 "Life Processes in Animals" (NCERT Class 7 Science, Curiosity book, 2026-27 rationalised syllabus) animals ke 5 major life processes cover karta hai — nutrition, respiration, transportation (circulation), excretion, aur control-coordination — jo unhe zinda rakhte hain aur environment ke saath adjust karne dete hain.
Life Processes in Animals, Class 7 Science ki Curiosity textbook (2026-27 rationalised session) ka Chapter 9 hai. Ye chapter samjhata hai ki har jeevit prani ko survive karne ke liye kuch basic kaam karne hi padte hain — chahe woh ek chhota amoeba ho ya ek insaan. Ye kaam hain: nutrition (khana lena aur digest karna), respiration (oxygen lena, CO₂ chhodna), transportation (blood circulation se substances ko body ke har hisse tak pahunchana), excretion (waste products ko bahar nikalna), aur control-coordination (nervous system aur muscles ka coordination jo movement aur response allow karta hai). Purani (pre-Curiosity) NCERT book me ye topics alag-alag chapters me the — jaise "Nutrition in Animals", "Respiration in Organisms", "Transportation in Animals and Plants" — lekin naye rationalised 12-chapter Curiosity book me inhe combine karke ek hi comprehensive chapter, "Life Processes in Animals," bana diya gaya hai. Chapter 1 poore Class 7 Science ki neev hai jahan se curiosity-based learning approach start hoti hai, aur is Chapter 9 tak aate-aate students already measurement, heat, light jaise physical-science concepts padh chuke hote hain — ab yahan biology ki taraf shift hota hai jo life ko function karte dekhna sikhata hai. Agar aap life processes in animals class 7 ncert pdf dhundh rahe ho ya life processes in plants class 7 notes hinglish ke saath compare karna chahte ho, toh ye guide dono angles cover karti hai taaki exam-ready ho sako.
Chapter 9 Summary — 5 Minute Revision
Is chapter me humne dekha ki animals apne survival ke liye paanch major life processes perform karte hain — nutrition (food intake aur digestion), respiration (gas exchange via lungs, gills, tracheae ya skin), transportation (heart-driven blood circulation jo nutrients-oxygen-waste carry karta hai), excretion (kidneys ke through metabolic waste removal), aur control-coordination (nervous system + muscles jo movement aur response manage karte hain). Different animals ke different organs hote hain in processes ke liye — jaise fish gills se saans lete hain jabki insects tracheae se, aur cold-blooded vs warm-blooded animals ka body temperature regulation bhi alag hota hai. Ye saare processes ek doosre se linked hain — agar respiration nahi hoga toh cells ko energy nahi milegi, agar transportation nahi hoga toh nutrients cells tak nahi pahunchenge. Exam ke liye organ-function pairs, process-definitions, aur diagram-based labelling par focus karo.In-Text Questions — Solutions
In-text Question 1: Insaan ka respiratory system kaunse organs se milkar bana hota hai?
Solution: Human respiratory system in organs se milkar banta hai: nostrils (naak) → pharynx → larynx → trachea (windpipe) → bronchi → bronchioles → alveoli (lungs ke andar). Alveoli hi wo jagah hain jahan actual gas exchange (oxygen andar, CO₂ bahar) hota hai kyunki inki wall bahut thin aur blood capillaries se ghiri hoti hai.
In-text Question 2: Cockroach kaise saans leta hai — insaan se kaise different hai?
Solution: Cockroach (aur baaki insects) apni body ke sides par present chhote-chhote openings spiracles se hawa andar lete hain, jo tracheae naam ki tubes ke network me jaake directly cells tak oxygen pahunchati hai. Insaan ke uljat lungs aur blood-based transport se different, insects me respiratory system directly tissues tak connected hota hai — blood is process me involved nahi hota.
In-text Question 3: Excretory system ka main organ kaunsa hai aur uska kaam kya hai?
Solution: Human excretory system ka main organ kidney hai. Kidneys blood ko filter karke usme se nitrogenous waste (jaise urea) nikalte hain aur usse urine ke roop me banate hain, jo ureters se urinary bladder me store hoke urethra se bahar nikal jaata hai. Skin (sweat ke through) aur lungs (CO₂ ke through) bhi excretion me chhota role play karte hain.
In-text Question 4: Blood circulation me heart ka role kya hai?
Solution: Heart ek pump ki tarah kaam karta hai jo continuously contract aur relax hoke blood ko poore body me circulate karta hai. Deoxygenated blood body se aake right side me jaata hai, lungs me oxygenate hota hai, phir left side se poore body me oxygenated blood pump hota hai — isse har cell tak oxygen aur nutrients pahunchte hain aur waste products wapas collect hote hain.
Exercise Questions — Solutions (Q1–Q7)
Q1. Fill in the blanks: (a) Fish apne ______ se saans lete hain. (b) Cockroach ka respiratory organ ______ kehlaata hai. (c) Frog gas exchange apni moist ______ se bhi kar sakta hai.
Solution:
(a) gills
(b) tracheae (spiracles ke through hawa andar jaati hai)
(c) skin (त्वचा)
Q2. Human heart kitne chambers ka bana hota hai? Har chamber ka naam aur kaam batao.
Solution: Human heart 4-chambered hota hai:
- Right atrium — poore body se deoxygenated blood receive karta hai (venae cavae ke through)
- Right ventricle — deoxygenated blood ko lungs ki taraf pump karta hai
- Left atrium — lungs se oxygenated blood receive karta hai (pulmonary veins ke through)
- Left ventricle — oxygenated blood ko poore body me pump karta hai (sabse moti muscular wall isi ki hoti hai kyunki isse sabse zyada pressure chahiye)
Q3. Excretion aur egestion me difference batao (table ke through).
Solution:
| Excretion | Egestion |
|---|---|
| Body ke cellular metabolic waste (jaise urea, uric acid, CO₂) ko bahar nikalna | Undigested food waste ko bahar nikalna |
| Kidneys, skin, lungs isme involved hote hain | Sirf large intestine aur anus involved hote hain |
| Blood se waste filter hota hai | Alimentary canal se seedha waste nikalta hai |
↔ Table ko side me swipe karein
Q4. Earthworm me respiration ka process short me likho.
Solution: Earthworm (केंचुआ) ki koi specialised respiratory organ nahi hoti. Iski body ki moist aur permeable skin hi gas exchange ka kaam karti hai. Skin ke through oxygen diffuse hoke blood capillaries me chala jaata hai aur CO₂ isi tarah bahar nikalta hai. Isi liye earthworm ko hamesha moist (nam) mitti me rehna padta hai — sookhi skin gas exchange nahi kar paati aur worm dam ghut sakta hai.
Q5. Nervous system aur muscular system milkar animal me kya kaam karte hain? Ek example ke saath samjhao.
Solution: Nervous system (brain + spinal cord + nerves) body ke andar aur bahar se signals receive karta hai aur muscles ko instructions bhejta hai, jisse movement aur response possible hota hai — ise control and coordination kehte hain.
Example: Jab haath garam cheez ko touch karta hai, skin ke receptors turant signal spinal cord ko bhejte hain, spinal cord bina brain ka wait kiye seedha arm muscles ko sikhna deta hai contract hone ka — isse haath turant peeche kheenchta hai. Ise reflex action kehte hain, jisme nervous aur muscular systems saath milkar kaam karte hain.
Q6. Cold-blooded aur warm-blooded animals me difference batao, do-do examples ke saath.
Solution:
| Cold-blooded (Ectothermic) | Warm-blooded (Endothermic) |
|---|---|
| Body temperature environment ke temperature ke saath change hoti hai | Body temperature constant rehti hai, environment se independent |
| Examples: frog, snake, lizard, fish | Examples: human, dog, cow, bird |
| Sardi me inactive ho jaate hain (jaise hibernation) | Metabolism internal heat generate karta hai, sardi-garmi dono me active reh sakte hain |
↔ Table ko side me swipe karein
Q7. Diagram banao aur label karo: human digestive system ke major parts.
Solution: Human digestive system ke major parts (order me): Mouth → Oesophagus (food pipe) → Stomach → Small intestine → Large intestine → Rectum → Anus. Iske saath accessory glands — liver (bile banata hai fat digestion ke liye) aur pancreas (digestive enzymes banata hai) — bhi is system me support karte hain. (Diagram ke liye textbook figure refer karo aur har part ko label karo.)
Important Equations — Ek Nazar Me
| Concept/Rule | Detail |
|---|---|
| 5 Major Life Processes | Nutrition, Respiration, Transportation, Excretion, Control & Coordination |
| Respiratory organs by animal type | Fish → Gills | Insects → Tracheae (via spiracles) | Frog/Earthworm → Moist skin | Humans/Mammals → Lungs |
| Human heart chambers | 2 Atria (upper) + 2 Ventricles (lower) = 4 chambers total |
| Blood flow path | Body → Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body |
| Excretory organ (humans) | Kidneys (main) → Ureters → Urinary bladder → Urethra |
| Digestive tract order | Mouth → Oesophagus → Stomach → Small Intestine → Large Intestine → Rectum → Anus |
| Cold vs Warm blooded | Ectothermic (body temp varies, e.g. frog, snake) vs Endothermic (body temp constant, e.g. human, bird) |
↔ Table ko side me swipe karein
Common Mistakes — Yahan Marks Kat te Hain
- Excretion aur egestion ko same samajhna — excretion cellular metabolic waste (urea) ke liye hai, egestion undigested food waste ke liye.
- Sochna ki sab animals lungs se hi saans lete hain — jabki fish gills se, insects tracheae se, aur earthworm/frog apni moist skin se bhi gas exchange karte hain.
- Heart ke chambers ka function confuse karna — right side deoxygenated blood handle karta hai, left side oxygenated blood; ise ulta likh dena common mistake hai.
- Cold-blooded aur warm-blooded animals ke examples galat jodna — reptiles/fish cold-blooded hote hain, birds/mammals warm-blooded.
- Diagram labelling me alveoli aur bronchioles ka sequence ulta likh dena — sahi order trachea → bronchi → bronchioles → alveoli hai.
- Control-coordination ko sirf 'brain ka kaam' samajh lena — jabki reflex actions me spinal cord bhi brain ke bina hi kaam karta hai, aur muscles bhi is process ka zaroori hissa hain.
Board-Style Important Questions
- NCERT textbook practice: 'Animals me hone waale kisi bhi do life processes ka naam likhkar unhe define karo' — conceptual definition-based question jo har chapter-end exercise me common hai.
- Diagram-based question: 'Human respiratory system ka labelled diagram banao' — NCERT ke chapter-end activities me is type ke diagram questions common hain.
- Assertion-reason / short-answer style: 'Fish paani ke bahar zyada der zinda kyu nahi reh paati?' — respiration organ (gills) ke function se related conceptual question, jo school-level test papers me frequently poocha jaata hai.
- Table/comparison based: 'Excretion aur egestion me antar spasht karo' — chapter ke core comparison concepts me se ek, jo unit tests me common format hai.
- HOTS (Higher Order Thinking) type: 'Agar kisi animal ka transportation system kaam karna band kar de, toh uske body par kya effect hoga?' — application-based reasoning question jo process-interdependence samajhne ke liye poocha jaata hai.
Aksar Poochhe Jaane Wale Sawaal
Class 7 Science Curiosity book me total kitne chapters hain aur ye 'Life Processes in Animals' kaunse number pe aata hai?
2026-27 session ke liye rationalised NCERT Class 7 Science Curiosity book me total 12 chapters hain (purani 13-chapter book se reduce hokar). 'Life Processes in Animals' is book ka Chapter 9 hai. Ye information multiple independent sources (ncerthinditutor.com, edurev.in, tiwariacademy) se cross-verify ki gayi hai, lekin final confirmation ke liye ncert.nic.in ki official PDF bhi ek baar check kar lena recommended hai.
Kya 'Nutrition in Animals' aur 'Respiration in Organisms' jaise purane chapters ab bhi syllabus me hain?
Nahi. Ye titles purani (pre-Curiosity) 13-chapter NCERT Class 7 Science book ke the, jo ab rationalised nahi rahe. Naye Curiosity book me inke concepts combine hokar 'Life Processes in Animals' aur 'Life Processes in Plants' jaise integrated chapters ban gaye hain. Kuch aggregator sites (jaise tiwariacademy ka first-fetch data) abhi bhi purane chapter names 2026-27 syllabus me galat list kar rahe hain — is spec ne verified current sources use kiye hain.
Life Processes in Animals aur Life Processes in Plants me kya basic difference hai?
Dono chapters life processes cover karte hain lekin different organisms ke context me. Animals me ye processes specialised organs (heart, lungs, kidneys, nervous system) ke through hote hain, jabki plants me ye processes different tarike se hote hain — jaise plants apna khana khud banate hain (photosynthesis) jabki animals ko khana dhoondhna aur khaana padta hai (ingestion-based nutrition). Agar aap life processes in plants class 7 notes hinglish dhundh rahe ho, toh dono chapters ko saath me compare karna concept clarity ke liye best rahega.
Class 7 Curiosity book ke exercise questions kahin se official PDF download ho sakte hain?
Official NCERT textbook PDF ncert.nic.in se free download ho sakti hai. Agar aap life processes in animals class 7 ncert pdf search kar rahe ho, toh official site hi sabse reliable source hai — third-party sites kabhi-kabhi outdated ya galat chapter versions upload kar dete hain, jaisa is chapter list ke case me bhi dekha gaya.
Is chapter me diagram-based questions kitne important hain exam ke liye?
Bahut important hain. Life Processes chapters me heart, digestive system, aur respiratory system ke labelled diagrams frequently poochhe jaate hain kyunki ye organs ke structure-function relationship ko test karte hain. Practice karte waqt har organ ka naam, uska position, aur uska specific kaam teeno yaad rakho — sirf diagram ratt lena kaafi nahi hota.
Curiosity book ke baaki chapters (jaise Electricity, Light, Earth-Moon-Sun) is chapter se kaise related hain?
Directly related nahi hain kyunki ye biology chapter hai aur baaki (jaise electricity circuits and their components class 7 ncert solutions, light shadows and reflections class 7 ncert solutions, ya earth moon and sun class 7 science chapter 12 notes) physical science ke topics hain. Lekin overall Curiosity book ka structure ek progression follow karta hai — measurement aur basic scientific thinking se shuru hoke, heat-light-electricity jaise physics concepts se hoke, phir biology (life processes) aur finally earth-space science tak. Poore class 7 science curiosity book chapter wise pdf download se aap ye pura flow dekh sakte ho.
Class 7 Science — Saare Chapters
NCERT Kaksha ek swatantra shaikshik platform hai aur NCERT ya CBSE se aadhikarik roop se sambaddh (officially affiliated) nahi hai. Kisi galti ki jaankari dene ke liye contact kijiye.