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Class 9th Hindi Medium Science Notes
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान गति नोट्स
🔷 1. गति की परिभाषा (Definition of Motion) जब कोई वस्तु समय के साथ अपनी स्थिति में परिवर्तन करती है, तो कहा जाता है कि वह गति में है। 📌 परिभाषा:गति वह स्थिति है जब कोई वस्तु समय के साथ अपनी स्थिति को बदलती है। उदाहरण: चलती गाड़ी, उड़ता पक्षी, बहता पानी। 🔶 2. गति
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान ऊतक नोट्स
🔷 1. भूमिका (Introduction) 📌 परिभाषा:ऊतक: समान संरचना और कार्य वाली कोशिकाओं का समूह। 🔹 2. ऊतकों के प्रकार (Types of Tissues) दो प्रमुख वर्ग: 🌿 3. पादप ऊतक (Plant Tissues) पादप ऊतक दो प्रकार के होते हैं: 🟢 A. मेरिस्टीमैटिक ऊतक (Meristematic Tissue) 📌 यह कोशिकाएँ लगातार विभाजित होती रहती हैं।📌 ये ऊतक वृद्धि
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान कोशिका – जीवन की मूल इकाई नोट्स
🔷 1. भूमिका (Introduction) 🔹 2. कोशिका की खोज और इतिहास वैज्ञानिक योगदान रॉबर्ट हुक (1665) कॉर्क (पेड़ की छाल) की पतली स्लाइस का परीक्षण करते हुए ‘सेल’ शब्द का पहली बार प्रयोग किया। लीuwenhoek पहली बार जीवित कोशिकाएँ देखीं। श्लाइडेन (1838) सभी पौधे कोशिकाओं से बने होते हैं। श्वान (1839) सभी जानवरों की संरचना
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान परमाणु और अणु नोट्स
🔷 1. भूमिका (Introduction) 🔹 2. डाल्टन का परमाणु सिद्धांत (Dalton’s Atomic Theory) ✍🏻 मुख्य बिंदु: 📌 सीमाएँ: बाद में हुए अनुसंधानों से यह सिद्ध हुआ कि परमाणु को और भी छोटे कणों (इलेक्ट्रॉन, प्रोटॉन, न्यूट्रॉन) में विभाजित किया जा सकता है। 🔹 3. तत्व, यौगिक और मिश्रण ✅ तत्व (Element): 📘 उदाहरण: ✅ यौगिक
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान परमाणु की संरचना नोट्स
🔷 1. प्रस्तावना (Introduction) हम जानते हैं कि पदार्थ अणुओं और परमाणुओं से बना होता है। लेकिन एक परमाणु अंदर से कैसा दिखता है? उसमें कौन-कौन से कण होते हैं? – यही इस अध्याय में पढ़ते हैं। 🔹 2. परमाणु का इतिहास (History of Atomic Models) (A) डाल्टन का परमाणु सिद्धांत (John Dalton – 1808)
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान शुद्ध पदार्थ नोट्स
🔷 परिचय (Introduction) हमारे आस-पास के पदार्थ दो प्रकार के होते हैं: यह अध्याय समझाता है कि कौन-से पदार्थ शुद्ध हैं, कौन-से मिश्रण हैं और उन्हें कैसे पहचाना और अलग किया जा सकता है। 🧊 1. शुद्ध पदार्थ क्या है? 📌 परिभाषा: वह पदार्थ जिसमें केवल एक ही प्रकार के कण (atoms या molecules) होते
CBSE Hindi Medium Class 9, Class 9th Hindi Medium Science Notes
कक्षा 9 विज्ञान हमारे आस-पास के पदार्थ नोट्स
परिचय (Introduction) हमारे चारों ओर बहुत सारी चीजें हैं — हवा, पानी, किताब, कुर्सी, मोबाइल, भोजन आदि। इन सभी को हम पदार्थ (Matter) कहते हैं। विज्ञान में पदार्थ को इस प्रकार परिभाषित किया गया है: “पदार्थ वह है जिसकी कोई द्रव्यमान (mass) और स्थान (volume) होता है और जो हमारी इंद्रियों से अनुभव किया जा