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Wednesday, August 26, 2026

Why is Respiration an Exothermic Reaction? | Class 10 Science CBSE
🔥 Why is Respiration Considered an Exothermic Reaction?
श्वसन को उष्माक्षेपी अभिक्रिया क्यों माना जाता है?
Class 10 Science | CBSE | Foundation | Competitive
1️⃣ Description / परिचय

English

Respiration is the process in which food, mainly glucose, is broken down in the presence of oxygen to release energy. The released energy is used by the cells for various life processes. Since energy is released during respiration, it is considered an exothermic process.

हिन्दी

श्वसन वह प्रक्रिया है जिसमें भोजन, मुख्यतः glucose, oxygen की उपस्थिति में टूटकर ऊर्जा उत्पन्न करता है। इस प्रक्रिया में ऊर्जा बाहर निकलती है, जिसका उपयोग कोशिकाएँ विभिन्न जैविक कार्यों के लिए करती हैं। इसलिए श्वसन को उष्माक्षेपी अभिक्रिया माना जाता है।
Key Point:

Respiration → Energy Released → Exothermic

श्वसन → ऊर्जा मुक्त → उष्माक्षेपी
2️⃣ Attractive Animation — Respiration
🫁 Respiration — Energy Release
O₂
O₂
O₂
Glucose + Oxygen → Carbon Dioxide + Water + Energy
3️⃣ Chemical Equation / रासायनिक समीकरण
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
English: Glucose reacts with oxygen during respiration and forms carbon dioxide, water and releases energy.

हिन्दी: श्वसन के दौरान glucose, oxygen के साथ अभिक्रिया करके carbon dioxide, water तथा energy बनाता है।
4️⃣ Full Step-by-Step Explanation / पूर्ण समाधान
Step 1: Food containing carbohydrates is converted into glucose.
कार्बोहाइड्रेट युक्त भोजन glucose में परिवर्तित होता है।
Step 2: Glucose reacts with oxygen inside cells.
Glucose कोशिकाओं के अंदर oxygen के साथ अभिक्रिया करता है।
Step 3: Glucose is oxidised to form carbon dioxide and water.
Glucose का oxidation होकर carbon dioxide और water बनते हैं।
Step 4: Energy is released during this reaction.
इस अभिक्रिया के दौरान ऊर्जा मुक्त होती है।
Step 5: Because energy is released, respiration is an exothermic process.
चूँकि इस प्रक्रिया में ऊर्जा मुक्त होती है, इसलिए श्वसन उष्माक्षेपी प्रक्रिया है।
Glucose + Oxygen → CO₂ + H₂O + Energy

Energy Released = Exothermic
5️⃣ CBSE Question — Full Solution
Q. Why is respiration considered an exothermic reaction? Explain.
CBSE Important
Answer / उत्तर:

English: Respiration is considered an exothermic reaction because during respiration glucose reacts with oxygen and releases energy. The energy released is utilised by the cells to perform various life processes. The overall reaction can be represented as:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
Since energy is released during the reaction, respiration is called an exothermic reaction.
हिन्दी: श्वसन को उष्माक्षेपी अभिक्रिया इसलिए माना जाता है क्योंकि श्वसन के दौरान glucose oxygen के साथ अभिक्रिया करके ऊर्जा मुक्त करता है। यह ऊर्जा कोशिकाओं द्वारा विभिन्न जीवन-क्रियाओं के लिए उपयोग की जाती है। इस अभिक्रिया को निम्न प्रकार लिखा जा सकता है:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ऊर्जा
चूँकि इस अभिक्रिया में ऊर्जा मुक्त होती है, इसलिए श्वसन को उष्माक्षेपी अभिक्रिया कहा जाता है।
6️⃣ Why is it Exothermic? / यह Exothermic क्यों है?
Remember:

An exothermic reaction is a reaction in which energy is released.

श्वसन में glucose के oxidation से energy release होती है।

Therefore:
Energy Released → Exothermic
7️⃣ 30 MCQs — CBSE + Foundation + Competitive
8️⃣ Assertion–Reason — 10 Questions
9️⃣ 2 Marks — 10 Questions with Full Solutions
🔟 3 Marks — 10 Questions with Full Solutions
1️⃣1️⃣ 4 Marks — 10 Questions with Full Solutions
1️⃣2️⃣ 5 Marks — 10 Questions with Full Solutions
1️⃣3️⃣ 6 Marks — 10 Questions with Full Solutions
1️⃣4️⃣ One Minute Revision / त्वरित पुनरावृत्ति
🧪 Glucose + Oxygen

CO₂ + H₂O + Energy

⚡ Energy Released

🔥 Exothermic Reaction
Exam Trick:

Question में यदि पूछा जाए —
Why is respiration exothermic?

तो सबसे पहले लिखें:

"Respiration releases energy during the oxidation of glucose."

फिर chemical equation लिखें।
🏆 Final CBSE Answer
English:

Respiration is considered an exothermic reaction because glucose is oxidised in the presence of oxygen and energy is released.

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy
Since energy is released, respiration is an exothermic reaction.
हिन्दी:

श्वसन को उष्माक्षेपी अभिक्रिया माना जाता है क्योंकि glucose का oxygen की उपस्थिति में oxidation होता है और ऊर्जा मुक्त होती है।

अतः ऊर्जा के मुक्त होने के कारण श्वसन एक उष्माक्षेपी अभिक्रिया है।