Respiration — Telangana (SSC) Class 10 Science Solutions (Free)
Free step-by-step Telangana (SSC) Class 10 Science solutions for "Respiration" — important questions with detailed answers, download PDF for board exam preparation.
TL;DR: Free step-by-step Telangana (SSC) Class 10 Science solutions for "Respiration" — important questions with detailed answers, download PDF for board exa…
By Syllab.in · Updated
Q1: Define respiration. Distinguish between aerobic and anaerobic respiration.
Respiration: Process of breaking down organic molecules (glucose) to release energy (ATP) for cellular activities.
Aerobic respiration:
Occurs in presence of oxygen
Organism: All animals, most plants, most microorganisms
Location: Mitochondria (mainly), some in cytoplasm
Substrate: Glucose (C₆H₁₂O₆)
Equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy (38 ATP)
Products: CO₂, H₂O, energy
Anaerobic respiration:
Occurs without oxygen
Organism: Some bacteria, fungi (yeast), muscle cells during intense a…
Q2: Explain the steps of aerobic respiration (glycolysis, Krebs cycle, electron transport chain).
Step 1 - Glycolysis (cytoplasm):
• Glucose (6C) → 2 Pyruvate (3C) + 2 ATP + 2 NADH
• No oxygen required
• Occurs in all cells
Step 2 - Krebs Cycle/Citric Acid Cycle (mitochondrial matrix):
• Pyruvate → Acetyl-CoA (enters cycle)
• Each glucose → 2 turns of cycle
• Produces: 4 CO₂, 2 ATP, 6 NADH, 2 FADH₂
• Oxidizes carbons completely to CO₂
Step 3 - Electron Transport Chain (inner mitochondrial membrane):
• NADH + FADH₂ release electrons
• Electrons pass through protein complexes (I, II, III, IV…
Q3: Describe the human respiratory system with diagram description. What are the functions of respiratory system?
Human respiratory system organs:
1. Nostrils/Nose: Filter, warm, humidify air
2. Nasal cavity: Lined with mucous membrane; warms air
3. Pharynx: Common passage for food and air
4. Larynx: Voice box; contains vocal cords
5. Trachea: Windpipe; supported by cartilage rings; branches into bronchi
6. Bronchi: Right (3 lobes) and left (2 lobes) main branches
7. Bronchioles: Further divisions of bronchi
8. Alveoli: Tiny air sacs (300 million); site of gas exchange; surrounded by capillaries
9.…
Q4: Explain the mechanism of breathing (inhalation and exhalation). What causes air to move in and out?
Breathing mechanism:
Inhalation (breathing in):
• Diaphragm contracts → flattens → moves downward
• Intercostal muscles (external) contract → ribcage moves up and outward
• Thoracic cavity volume increases
• Pressure inside lungs decreases (below atmospheric)
• Air rushes in along pressure gradient
• Duration: ~2 seconds
Exhalation (breathing out):
• Diaphragm relaxes → curves up → moves upward
• Intercostal muscles (external) relax → ribcage moves down and inward
• Thoracic cavity volume decr…
Q5: Explain gaseous exchange in lungs and tissues. What is the role of hemoglobin?
Gas exchange in lungs (external respiration):
• Alveoli (capillaries) surrounded by air (high O₂, low CO₂)
• Blood from heart arrives with low O₂, high CO₂
• O₂ diffuses from alveoli → blood capillaries
• CO₂ diffuses from blood → alveoli
• Oxygenated blood returns to heart → distributed to body
Gas exchange in tissues (internal respiration):
• Tissue cells carrying out respiration (consuming O₂, producing CO₂)
• Blood capillaries arrive with high O₂, low CO₂
• O₂ diffuses from blood → cells
• …
Showing 5 of 7 questions — full solutions on the page.