Respiration in Organisms — Class 7 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 7 Science chapter "Respiration in Organisms" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 7 Science chapter "Respiration in Organisms" — 8 important questions with detailed answers for CBSE board…
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Key Questions Covered:
- Define respiration.
- What is aerobic respiration?
- What is anaerobic respiration? Give one example.
- What happens to our muscles during sudden exercise?
- Why do we breathe?
- Describe the process of breathing in humans.
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define respiration. | ✓ Solved |
| What is aerobic respiration? | ✓ Solved |
| What is anaerobic respiration? Give one example. | ✓ Solved |
| What happens to our muscles during sudden exercise? | ✓ Solved |
| Why do we breathe? | ✓ Solved |
| Describe the process of breathing in humans. | ✓ Solved |
Showing 6 of 8 questions
Q1: Define respiration.
Respiration is the process by which organisms break down food (glucose) to release energy.
Formula: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
Energy is used for all life activities.
Q2: What is aerobic respiration?
Aerobic respiration is the breakdown of glucose in the presence of oxygen.
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2,900 kJ energy
It occurs in mitochondria and releases more energy than anaerobic respiration.
Q3: What is anaerobic respiration? Give one example.
Anaerobic respiration is the breakdown of glucose in the absence of oxygen.
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + energy (in yeast)
Or C₆H₁₂O₆ → 2CH₃COOH + energy (in bacteria)
It releases less energy than aerobic respiration.
Q4: What happens to our muscles during sudden exercise?
During sudden exercise, muscles need more energy but oxygen supply is limited.
Muscles undergo anaerobic respiration to produce lactic acid.
Lactic acid accumulates causing muscle cramps or fatigue.
Deep breathing after exercise helps oxidise lactic acid.
Q5: Why do we breathe?
We breathe to take in oxygen and expel carbon dioxide.
Oxygen is essential for aerobic respiration in cells.
Respiration produces energy (ATP) required for all body functions.
Carbon dioxide is a waste product that must be removed.
Q6: Describe the process of breathing in humans.
Breathing has two phases:
1. Inhalation: Diaphragm contracts and moves down; intercostal muscles lift the ribcage; air enters the lungs
2. Exhalation: Diaphragm relaxes; intercostal muscles relax; ribcage falls; air is pushed out of lungs
Showing 6 of 8 questions. Visit the full page for complete solutions.
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