Class 7 Science revision note
Class 7 Science is the first full year photosynthesis, acids-bases and electric current share one textbook. The rationalized NCERT dropped a few older chapters; what remains is the set CBSE still samples in periodic tests. This hub writes one unique paragraph and a question cluster per surviving chapter so “nutrition in plants class 7 important questions” and “heat class 7 MCQ” resolve to real practice, not an empty subject shell. Answers stay behind a tap. Hindi and English stems sit together because most school papers are bilingual. You are on the full Class 7 Science bank (All Q&A), page 1 of 8 — 156 questions in this filter. This page lists mixed MCQ, short and long items so a weekly test feels like the school paper. Reveal a key only after you have written your own line. High-search phrases such as class 7 science important questions and कक्षा 7 विज्ञान प्रश्न उत्तर are mapped to these chips, not to an empty database shell. Phone layout: chapter chips scroll sideways, answers stay inside a tap, and the next page is a numbered link so Google and students both get a short URL. Updated for 2026 classroom practice on the rationalized NCERT.
Chapter-wise unique notes — Class 7 Science
1. Nutrition in Plants पौधों में पोषण
Autotrophs fix carbon with chlorophyll, sunlight, carbon dioxide and water; the word photosynthesis is not a decoration — it is the only food-making route for green plants. Stomata are the gates, not the kitchen. Heterotrophic modes — parasitic, insectivorous, saprotrophic — appear because a total autotroph story would hide Cuscuta and fungi. Nitrogen from soil is not “food”; it is a raw material after bacteria help. Questions here stay on NCERT diagrams of a leaf section and the starch test, not Class 10 life-process equations.
Practice Nutrition in Plants →
2. Nutrition in Animals जंतुओं में पोषण
Ingestion, digestion, absorption, assimilation, egestion — five steps, five different organs if you are talking about a human. Amoeba has no tube; it folds food into a vacuole. The rumination story of cattle is a Class 7 favourite because two chewing rounds confuse students who only memorise “stomach”. Bile emulsifies fats; it does not digest them the way lipase does. These items match the rationalized chapter, not an old unused alimentary-canal poster.
Practice Nutrition in Animals →
3. Heat ऊष्मा
Heat flows from hotter to colder until temperatures meet. Conduction needs a material; convection needs a fluid; radiation does not need air — that triad is the whole chapter. Clinical thermometer and laboratory thermometer are not interchangeable: range and kink differ. Land and sea breeze are convection in disguise. Dark surfaces absorb better; that is why a black road feels hotter. Numericals stay at reading a scale, not Class 11 specific heat.
Practice Heat →
4. Acids, Bases and Salts अम्ल, क्षार और लवण
Sour acids, bitter soapy bases, and a salt when they neutralise — Class 7 keeps it kitchen-lab simple. Litmus, turmeric, china rose and phenolphthalein are indicators with different colour stories. Neutralisation is not “mixing any two liquids”. Distilled water is closer to neutral than rain in a polluted city. Questions ask you to pick the indicator result, not to write Class 10 ionic equations.
Practice Acids, Bases and Salts →
5. Physical and Chemical Changes भौतिक एवं रासायनिक परिवर्तन
A physical change can usually be reversed without a new substance; a chemical change makes something that was not on the table. Melting ice versus rusting iron is the textbook pair. Crystallisation is a physical route to a pure solid. Burning magnesium is chemical even if the ribbon looked “only brighter”. Class 7 does not yet demand balancing equations — it demands the right label and one reason.
Practice Physical and Chemical Changes →
6. Respiration in Organisms जीवों में श्वसन
Breathing is the mechanical part; cellular respiration is the energy part. Aerobic respiration uses oxygen and yields more energy than anaerobic yeast or tired muscle (lactic acid). Insects use tracheae, earthworms use moist skin, fish use gills — one idea, many surfaces. The diaphragm story in humans is a frequent diagram question. Do not write Class 10 pyruvate pathways here; stay with NCERT Class 7 wording.
Practice Respiration in Organisms →
7. Transportation in Animals and Plants जंतुओं और पौधों में परिवहन
Blood is a connective tissue that carries more than oxygen. Arteries leave the heart, veins return, capillaries exchange. A fish heart is two-chambered; a human heart is four. Xylem is one-way water; phloem is sugar traffic that can reverse. Transpiration pull is not a pump like the heart. Questions mix a labelled heart sketch with a wilted-leaf reason.
Practice Transportation in Animals and Plants →
8. Reproduction in Plants पौधों में जनन
Vegetative parts — stem, root, leaf — can start a new plant; that is asexual. Flowers own the sexual route: pollen, stigma, ovary, fruit. Unisexual versus bisexual, self versus cross, wind versus insect — three pairs that papers shuffle. Seed dispersal by wind, water and animals is not a story hour; it is an exam list. Keep pollination and fertilisation as two steps, not one word.
Practice Reproduction in Plants →
9. Motion and Time गति एवं समय
Distance is the path; speed is distance over time. A distance–time graph that is a straight slope means uniform speed; a curve means the speed is changing. Oscillations of a simple pendulum give a practical unit of time. SI units matter: second, metre, metre per second. Class 7 does not yet need vector velocity; it needs clean reading of a graph axis.
Practice Motion and Time →
10. Electric Current and its Effects विद्युत धारा और इसके प्रभाव
A closed path, a cell, a switch and a bulb — that is the Class 7 circuit. Heating effect explains a fuse and an electric iron; magnetic effect explains an electromagnet and a compass twitch. Symbols for cell, battery, key, bulb and connecting wire must be drawn the NCERT way. Never connect a wire straight across a cell as a “shortcut” in real life. Questions stay qualitative plus one circuit-identify item.
Practice Electric Current and its Effects →
11. Light प्रकाश
Light travels in straight lines; that is why shadows have edges. A real image can be caught on a screen; a virtual image cannot. Concave mirrors converge, convex mirrors diverge, a plane mirror keeps size and reverses left-right. Newton’s disc and the spectrum through a prism are the colour story. Class 7 does not ask mirror formula; it asks ray sketches and uses (make-up, vehicle, torch).
Practice Light →
12. Forests: Our Lifeline वन: हमारी जीवन रेखा
A forest is a system, not a timber shop. Canopy, understorey and forest floor recycle water and soil. Food chains start with green plants and end with decomposers that the chapter refuses to ignore. Cutting one layer changes rain, soil and the next animal. These questions are value-plus-fact: name the layer, name the role, name one human pressure.
Practice Forests: Our Lifeline →
13. Wastewater Story अपशिष्ट जल की कहानी
Sewage is more than dirty water — it is a public-health pipe. Grit, sedimentation, aeration and disinfection are the treatment words Class 7 wants. Open drains and uncovered manholes are not “normal city life”; they are infection routes. Household good practice (oil not down the sink) sits beside the plant diagram. Write the steps in order; shuffled steps lose the mark.
Practice Wastewater Story →
Q.1
MCQ
Nutrition in Plants
प्रकाश-संश्लेषण के लिए अनिवार्य नहीं?
- A. CO2
- B. प्रकाश
- C. क्लोरोफिल
- D. मृदा की रेत ही
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Correct option: D — मृदा की रेत ही
रेत भोजन नहीं बनाती; हरा पत्ता रसोई है।
Q.2
MCQ
Nutrition in Plants
स्टोमेटा मुख्यतः क्या करते हैं?
- A. केवल जड़ बढ़ाना
- B. गैस विनिमय
- C. केवल फूल रंगना
- D. केवल बीज उड़ाना
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Correct option: B — गैस विनिमय
CO2 प्रवेश, O2/जलवाष्प निकास।
Q.3
MCQ
Nutrition in Plants
परजीवी पौधे का उदाहरण?
- A. गेहूँ
- B. अमरबेल (Cuscuta)
- C. आम
- D. धान
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Correct option: B — अमरबेल (Cuscuta)
Cuscuta पोषण परपोषी से लेती है।
Q.4
MCQ
Nutrition in Plants
नाइट्रोजन पौधों को प्रायः कैसे मिलती है?
- A. केवल हवा से सीधे प्रोटीन
- B. मृदा/जीवाणु सहायता से
- C. केवल चाँदनी से
- D. केवल नमक से
View the correct answer
Correct option: B — मृदा/जीवाणु सहायता से
Class 7: मृदा पोषक; जीवाणु नाइट्रोजन स्थिर कर सकते हैं।
Q.5
Short
Nutrition in Plants
प्रकाश-संश्लेषण शब्द-समीकरण लिखें।
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कार्बन डाइऑक्साइड + जल → (प्रकाश, क्लोरोफिल) ग्लूकोज + ऑक्सीजन।
Q.6
Long
Nutrition in Plants
स्वपोषी और विषमपोषी पोषण में अंतर उदाहरण सहित लिखें।
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स्वपोषी: हरे पौधे प्रकाश से भोजन बनाते हैं।
विषमपोषी: जंतु, कवक, परजीवी तैयार भोजन लेते हैं।
उदाहरण: आम का पेड़ बनाम अमरबेल/कुकुरमुत्ता।
Q.7
MCQ
Nutrition in Plants
कक्षा 7 Nutrition in Plants: प्रयोग/आरेख का सही क्रम?
- A. निष्कर्ष पहले, प्रेक्षण बाद
- B. प्रेक्षण → नियम → निष्कर्ष
- C. केवल रटंत परिभाषा
- D. केवल YouTube शॉर्ट्स
View the correct answer
Correct option: B — प्रेक्षण → नियम → निष्कर्ष
NCERT Science/Physics/Chem/Bio आरेख प्रेक्षण से नियम की ओर चलते हैं।
Q.8
MCQ
Nutrition in Plants
Class 7 Science — Nutrition in Plants का NCERT फोकस सबसे सटीक कौन-सा है?
- A. केवल रटंत तिथि-सूची बिना अवधारणा
- B. Autotrophs fix carbon with chlorophyll, sunlight, carbon dioxide and water; the word photosy…
- C. केवल Class 6 दोहराव
- D. केवल deleted chapter का पुराना PDF
View the correct answer
Correct option: B — Autotrophs fix carbon with chlorophyll, sunlight, carbon dioxide and water; the word photosy…
यह अध्याय rationalized NCERT Class 7 में है। पैराग्राफ वही परीक्षा-फोकस दोहराता है।
Q.9
Short
Nutrition in Plants
Nutrition in Plants (कक्षा 7) को 3 पंक्तियों में लिखें — परिभाषा, एक उदाहरण, एक परीक्षा-चूक।
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परिभाषा: Nutrition in Plants / पौधों में पोषण Class 7 Science का पाठ है।
उदाहरण: NCERT चित्र या संख्यात्मक इसी अध्याय से लें।
चूक: अगली कक्षा का सूत्र या deleted पाठ न घुसाएँ।
Q.10
Long
Nutrition in Plants
Class 7 Science — Nutrition in Plants पर एक unit-test उत्तर लिखें (परिचय, 4 बिंदु, निष्कर्ष)।
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Autotrophs fix carbon with chlorophyll, sunlight, carbon dioxide and water; the word photosynthesis is not a decoration — it is the only food-making route for green plants. Stomata are the gates, not the kitchen. Heterotrophic modes — parasitic, insectivorous, saprotrophic — appear because a total autotroph story would hide Cuscuta and fungi. Nitrogen from soil is not “food”; it is a raw material after bacteria help. Questions here stay on NCERT diagrams of a leaf section and the starch test, not Class 10 life-process equations.
चार बिंदु: (1) NCERT परिभाषा/सूत्र/घटना। (2) एक उदाहरण या आरेख-विचार। (3) एक तुलना या कारण। (4) एक साधारण संख्यात्मक या उद्धरण यदि पाठ माँगता है।
निष्कर्ष: उत्तर अध्याय-सत्य रखें — बोर्ड की डेटशीट यहाँ नहीं गढ़ी गई।
Q.11
MCQ
Nutrition in Animals
मानव पाचन में पित्त का मुख्य काम?
- A. प्रोटीन को अमीनो अम्ल
- B. वसा का इमल्सीकरण
- C. स्टार्च को केवल ग्लूकोज तुरंत
- D. केवल दाँत साफ
View the correct answer
Correct option: B — वसा का इमल्सीकरण
Bile वसा बिखेरता है; लाइपेज पचाता है।
Q.12
MCQ
Nutrition in Animals
अमीबा भोजन कैसे लेता है?
- A. दाँतों से
- B. कूटपाद से रिक्तिका
- C. केवल क्लोरोफिल
- D. केवल गलफड़े
View the correct answer
Correct option: B — कूटपाद से रिक्तिका
Pseudopodia भोजन घेरते हैं।
Q.13
MCQ
Nutrition in Animals
रोमंथी पशु दोबारा क्यों चबाते हैं?
- A. केवल शौक
- B. सेलुलोस/घास का बेहतर पाचन
- C. केवल पानी पीने
- D. केवल दौड़ने
View the correct answer
Correct option: B — सेलुलोस/घास का बेहतर पाचन
Rumination Class 7 का नियमित प्रश्न।
Q.14
Short
Nutrition in Animals
पाचन की पाँच अवस्थाएँ क्रम से लिखें।
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Ingestion, digestion, absorption, assimilation, egestion.
Q.15
MCQ
Nutrition in Animals
कक्षा 7 Nutrition in Animals: प्रयोग/आरेख का सही क्रम?
- A. निष्कर्ष पहले, प्रेक्षण बाद
- B. प्रेक्षण → नियम → निष्कर्ष
- C. केवल रटंत परिभाषा
- D. केवल YouTube शॉर्ट्स
View the correct answer
Correct option: B — प्रेक्षण → नियम → निष्कर्ष
NCERT Science/Physics/Chem/Bio आरेख प्रेक्षण से नियम की ओर चलते हैं।
Q.16
MCQ
Nutrition in Animals
Class 7 Science — Nutrition in Animals का NCERT फोकस सबसे सटीक कौन-सा है?
- A. केवल रटंत तिथि-सूची बिना अवधारणा
- B. Ingestion, digestion, absorption, assimilation, egestion — five steps, five different organs…
- C. केवल Class 6 दोहराव
- D. केवल deleted chapter का पुराना PDF
View the correct answer
Correct option: B — Ingestion, digestion, absorption, assimilation, egestion — five steps, five different organs…
यह अध्याय rationalized NCERT Class 7 में है। पैराग्राफ वही परीक्षा-फोकस दोहराता है।
Q.17
Short
Nutrition in Animals
Nutrition in Animals (कक्षा 7) को 3 पंक्तियों में लिखें — परिभाषा, एक उदाहरण, एक परीक्षा-चूक।
View the correct answer
परिभाषा: Nutrition in Animals / जंतुओं में पोषण Class 7 Science का पाठ है।
उदाहरण: NCERT चित्र या संख्यात्मक इसी अध्याय से लें।
चूक: अगली कक्षा का सूत्र या deleted पाठ न घुसाएँ।
Q.18
Long
Nutrition in Animals
Class 7 Science — Nutrition in Animals पर एक unit-test उत्तर लिखें (परिचय, 4 बिंदु, निष्कर्ष)।
View the correct answer
Ingestion, digestion, absorption, assimilation, egestion — five steps, five different organs if you are talking about a human. Amoeba has no tube; it folds food into a vacuole. The rumination story of cattle is a Class 7 favourite because two chewing rounds confuse students who only memorise “stomach”. Bile emulsifies fats; it does not digest them the way lipase does. These items match the rationalized chapter, not an old unused alimentary-canal poster.
चार बिंदु: (1) NCERT परिभाषा/सूत्र/घटना। (2) एक उदाहरण या आरेख-विचार। (3) एक तुलना या कारण। (4) एक साधारण संख्यात्मक या उद्धरण यदि पाठ माँगता है।
निष्कर्ष: उत्तर अध्याय-सत्य रखें — बोर्ड की डेटशीट यहाँ नहीं गढ़ी गई।
Q.19
MCQ
Heat
ऊष्मा स्वतः किस दिशा बहती है?
- A. ठंडे से गर्म
- B. गर्म से ठंडे
- C. केवल ऊपर
- D. केवल धातु में
View the correct answer
Correct option: B — गर्म से ठंडे
ताप संतुलन तक।
Q.20
MCQ
Heat
विकिरण के लिए माध्यम?
- A. अनिवार्य ठोस
- B. अनिवार्य नहीं
- C. केवल जल
- D. केवल लोहा
View the correct answer
Correct option: B — अनिवार्य नहीं
सूर्य का ताप निर्वात पार करता है।
People also ask — Class 7 Science
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