Life Processes Class 10 MCQ Set 5 | Respiration Complete | NCERT JKBOSE CBSE

 

Topic Coverage: Respiration definition, aerobic and anaerobic respiration, breakdown of glucose pathways, ATP-ADP cycle, human respiratory system, breathing mechanism, and gas exchange.

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📌 Quiz: Biology 10th

📚 Subject: Biology

🏫 Class: Class 10

📖 Chapter: Life Process Set E

📝 Questions: 50

📘 Biology 10th

Biology | Life Process Set E

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Q1. What is respiration?

A. Only the process of breathing in and out

B. The breakdown of glucose inside living cells to release energy, with or without oxygen

C. The process of photosynthesis in plants

D. The transport of oxygen by blood

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Q2. What are the different pathways for the breakdown of glucose?

A. Only one pathway that always uses oxygen

B. Two pathways: only aerobic and only anaerobic

C. Three main pathways: aerobic respiration, anaerobic respiration in muscles, and anaerobic respiration in yeast

D. Only the pathway that produces carbon dioxide and water

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Q3. What happens to glucose during aerobic respiration?

A. It is broken down completely into carbon dioxide and water, releasing a large amount of energy

B. It is broken down into lactic acid and energy

C. It is broken down into ethanol and carbon dioxide

D. It is converted directly into ATP without any byproducts

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Q4. What happens to glucose during anaerobic respiration in human muscles?

A. It is completely broken down into carbon dioxide and water

B. It is broken down into ethanol and carbon dioxide

C. It is broken down into lactic acid and a small amount of energy

D. It is stored as glycogen without any breakdown

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Q5. What happens to glucose during anaerobic respiration in yeast?

A. It is broken down into lactic acid

B. It is broken down into ethanol and carbon dioxide, releasing a small amount of energy

C. It is completely broken down into water only

D. It is converted into starch for storage

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Q6. What is ATP?

A. A waste product of respiration

B. Adenosine triphosphate, the energy currency of the cell

C. A type of digestive enzyme

D. A pigment found in chloroplasts

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Q7. What does the symbol ADP represent?

A. Adenosine diphosphate, a molecule with two phosphate groups

B. A type of vitamin

C. Adenosine triphosphate with three phosphates

D. A digestive hormone

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Q8. What does the symbol Pi represent in the equation ADP + Pi ⇌ ATP?

A. Phosphorus ion

B. Inorganic phosphate

C. Protein inhibitor

D. Pyruvate intermediate

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Q9. What does the reversible arrow (⇌) mean in the equation ADP + Pi ⇌ ATP?

A. The reaction only goes from left to right

B. The reaction only goes from right to left

C. The reaction is reversible, meaning ATP can be formed from ADP+Pi and ATP can break down into ADP+Pi depending on energy availability and demand

D. The reaction is not related to energy

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Q10. How is energy stored in the ATP molecule?

A. In the sugar molecule

B. In the bonds between the phosphate groups, especially the terminal bond

C. In the adenine base

D. In the hydrogen bonds between strands

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Q11. Which part of the human respiratory system is the main site of gas exchange?

A. Trachea

B. Bronchi

C. Alveoli

D. Nasal cavity

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Q12. What is the function of the diaphragm in human respiration?

A. To filter dust from inhaled air

B. To produce sound for speech

C. To create pressure changes that draw air into and push air out of the lungs

D. To exchange gases between blood and air

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Q13. During the breakdown of glucose by various pathways, where does glycolysis occur?

A. In the mitochondria

B. In the nucleus

C. In the cytoplasm

D. In the ribosomes

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Q14. What is the ultimate source of energy for the formation of ATP from ADP and Pi?

A. Sunlight directly

B. The breakdown of glucose and other food molecules during respiration

C. Water molecules

D. Carbon dioxide

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Q15. Which pathway of glucose breakdown produces the maximum number of ATP molecules per glucose?

A. Anaerobic respiration in muscles

B. Anaerobic respiration in yeast

C. Aerobic respiration

D. All produce the same amount

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Q16. Arrange the following parts of the human respiratory system in the correct order through which air passes during inhalation:

A. Nostril → Pharynx → Trachea → Bronchus → Bronchiole → Alveolus

B. Nostril → Trachea → Pharynx → Bronchus → Alveolus → Bronchiole

C. Pharynx → Nostril → Trachea → Bronchiole → Bronchus → Alveolus

D. Nostril → Bronchus → Trachea → Pharynx → Alveolus → Bronchiole

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Q17. What happens to the ATP molecule after it releases energy for cellular work?

A. It is broken down into carbon dioxide and water

B. It is converted into ADP and inorganic phosphate and is later recycled back to ATP

C. It is permanently destroyed and excreted

D. It is stored in the nucleus for future use

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Q18. What is the role of NADH and FADH₂ in the breakdown of glucose during aerobic respiration?

A. They directly produce ATP without any other steps

B. They carry high-energy electrons from glycolysis and the Krebs cycle to the electron transport chain, where ATP is produced

C. They break down glucose into pyruvate

D. They transport oxygen to the mitochondria

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Q19. Which of the following is the correct chemical equation for aerobic respiration?

A. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

B. 6CO₂ + 6H₂O + Energy → C₆H₁₂O₆ + 6O₂

C. C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + Energy

D. C₆H₁₂O₆ → 2C₃H₆O₃ + Energy

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Q20. Which of the following is the correct chemical equation for anaerobic respiration in yeast?

A. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

B. 6CO₂ + 6H₂O + Energy → C₆H₁₂O₆ + 6O₂

C. C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + Energy

D. C₆H₁₂O₆ → 2C₃H₆O₃ + Energy

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Q21. Which of the following is the correct chemical equation for anaerobic respiration in human muscles?

A. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

B. 6CO₂ + 6H₂O + Energy → C₆H₁₂O₆ + 6O₂

C. C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + Energy

D. C₆H₁₂O₆ → 2C₃H₆O₃ + Energy

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Q22. Why do we breathe faster after exercising?

A. To get more water into the body

B. To supply more oxygen for aerobic respiration and remove excess carbon dioxide

C. To cool down the body

D. To increase blood pressure

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Q23. What causes muscle cramps during vigorous exercise?

A. Lack of oxygen leading to anaerobic respiration and accumulation of lactic acid in muscles

B. Excess oxygen in muscles

C. Accumulation of carbon dioxide

D. Lack of glucose in muscles

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Q24. How is lactic acid removed from muscles after exercise?

A. It is excreted through sweat

B. It is converted back to glucose in the liver or broken down to carbon dioxide and water when oxygen becomes available

C. It is stored permanently in muscles

D. It is converted into ethanol

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Q25. What is the role of the trachea in the respiratory system?

A. To exchange gases

B. To transport air from the pharynx to the bronchi

C. To produce sound

D. To filter air

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Q26. What prevents the trachea from collapsing during breathing?

A. Muscles

B. Cartilage rings

C. Bones

D. Ligaments

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Q27. What is the function of the bronchi in the respiratory system?

A. To exchange gases

B. To transport air from the trachea into the lungs

C. To produce sound

D. To filter air

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Q28. What is the function of the bronchioles in the respiratory system?

A. To exchange gases

B. To transport air from the bronchi to the alveoli

C. To produce sound

D. To filter air

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Q29. What is the function of the alveoli in the respiratory system?

A. To transport air

B. To exchange gases with blood through diffusion

C. To produce sound

D. To filter air

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Q30. Why are the alveoli highly vascularized (have many blood capillaries)?

A. To warm the air

B. To facilitate efficient exchange of gases between air and blood

C. To produce mucus

D. To filter particles from air

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Q31. What is the role of the pleural membrane around the lungs?

A. To exchange gases

B. To reduce friction between the lungs and the chest wall during breathing

C. To produce sound

D. To filter air

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Q32. Which gas is transported by hemoglobin in red blood cells?

A. Carbon dioxide only

B. Oxygen primarily, and some carbon dioxide

C. Nitrogen only

D. Hydrogen only

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Q33. How is most carbon dioxide transported in the blood?

A. As dissolved gas in plasma

B. Bound to hemoglobin

C. As bicarbonate ions in plasma

D. As solid crystals

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Q34. Why is breathing through the nose better than breathing through the mouth?

A. The nose filters, warms, and moistens the air

B. The nose allows more air to enter

C. The nose produces more oxygen

D. The nose removes carbon dioxide

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Q35. What is the function of the cilia in the respiratory tract?

A. To exchange gases

B. To trap and sweep dust and mucus upward toward the throat

C. To produce sound

D. To filter blood

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Q36. What is vital capacity in relation to respiration?

A. The total volume of air that can be exhaled after maximum inhalation

B. The volume of air inhaled during normal breathing

C. The volume of air remaining in the lungs after maximum exhalation

D. The volume of air exchanged during exercise

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Q37. Which enzyme is involved in the breakdown of glucose during glycolysis?

A. Pepsin

B. Hexokinase

C. Trypsin

D. Lipase

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Q38. Where does the Krebs cycle occur in the cell?

A. In the cytoplasm

B. In the matrix of mitochondria

C. In the nucleus

D. In the cell membrane

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Q39. Where does the electron transport chain occur in the cell?

A. In the cytoplasm

B. In the inner mitochondrial membrane

C. In the nucleus

D. In the cell membrane

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Q40. What is the role of oxygen in aerobic respiration?

A. To break down glucose

B. To act as the final electron acceptor in the electron transport chain, forming water

C. To produce ATP directly

D. To combine with carbon dioxide

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Q41. What happens to the number of ATP molecules produced if oxygen is not available?

A. More ATP is produced

B. Less ATP is produced

C. The same amount of ATP is produced

D. No ATP is produced

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Q42. What is the normal breathing rate of an adult human at rest?

A. 5-10 breaths per minute

B. 12-20 breaths per minute

C. 25-30 breaths per minute

D. 40-50 breaths per minute

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Q43. What is the function of the ribs in respiration?

A. To protect the lungs and assist in breathing movements

B. To exchange gases

C. To produce sound

D. To filter air

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Q44. What happens to the volume of the chest cavity during inhalation?

A. It decreases

B. It increases

C. It remains the same

D. It becomes zero

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Q45. What happens to the volume of the chest cavity during exhalation?

A. It decreases

B. It increases

C. It remains the same

D. It becomes zero

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Q46. Which of the following is NOT a characteristic of alveoli that facilitates gas exchange?

A. Thin walls

B. Large surface area

C. Thick muscular walls

D. Rich blood supply

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Q47. What is the function of the pulmonary artery?

A. To carry oxygenated blood from the lungs to the heart

B. To carry deoxygenated blood from the heart to the lungs

C. To carry oxygenated blood to the body

D. To carry deoxygenated blood from the body to the heart

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Q48. What is the function of the pulmonary vein?

A. To carry oxygenated blood from the lungs to the heart

B. To carry deoxygenated blood from the heart to the lungs

C. To carry oxygenated blood to the body

D. To carry deoxygenated blood from the body to the heart

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Q49. Why is diffusion sufficient for gas exchange in the alveoli?

A. Because the concentration gradient and large surface area allow passive movement of gases

B. Because active transport pumps gases across the membrane

C. Because the alveoli pump gases

D. Because gases move by gravity

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Q50. What is the effect of smoking on the respiratory system?

A. It has no effect

B. It damages the alveoli and causes respiratory diseases

C. It improves lung function

D. It increases oxygen absorption

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