Practicing these MCQ on Respiration will indeed benefit students in conducting a quick revision of the concepts covered in the respiration chapter and preparing effectively for the board exams.
By cross-checking answers with detailed explanations provided alongside each question, students can reinforce their understanding of key topics and improve their problem-solving skills.
MCQ on Respiration
1. What is respiration?
a) The process of inhaling and exhaling
b) The process of breaking down glucose to release energy
c) The transport of oxygen in the blood
d) The exchange of gases in the lungs
Answer: b) The process of breaking down glucose to release energy
Explanation: Respiration refers to the biochemical process in cells where glucose is oxidized to release energy in the form of ATP (adenosine triphosphate).
2. Which of the following statements is true about respiration?
a) Respiration only occurs in humans
b) Respiration produces oxygen
c) Respiration is an anaerobic process
d) Respiration involves the breakdown of glucose
Answer: d) Respiration involves the breakdown of glucose
Explanation: Respiration involves the oxidation of glucose to produce energy in the form of ATP, which occurs in both aerobic and anaerobic conditions.
3. Which statement is true about the respiratory system?
a) It only involves the lungs
b) It exchanges oxygen and carbon dioxide between blood and tissues
c) It is not involved in gas exchange
d) It is not necessary for cellular respiration
Answer: b) It exchanges oxygen and carbon dioxide between blood and tissues
Explanation: The respiratory system includes organs like the lungs, bronchi, and alveoli that facilitate the exchange of gases (oxygen and carbon dioxide) between blood and tissues.
4. Which of the following is correct for respiration in plants?
a) Plants do not respire
b) Plants only respire during the day
c) Plants respire aerobically using mitochondria
d) Plants respire anaerobically using chloroplasts
Answer: c) Plants respire aerobically using mitochondria
Explanation: Plants undergo aerobic respiration in mitochondria, similar to animals, to generate ATP from glucose.
5. Which of the following is the correct definition of respiration?
a) The process of breathing in oxygen
b) The breakdown of glucose to release energy
c) The transport of oxygen in the blood
d) The exchange of gases in the lungs
Answer: b) The breakdown of glucose to release energy
Explanation: Respiration involves the breakdown of glucose (or other organic molecules) to release energy, which is used by cells for various metabolic activities.
6. Which of the following statements about the functions of the respiratory system is/are true?
a) It helps in the exchange of oxygen and carbon dioxide
b) It helps regulate pH balance in the body
c) It assists in vocalization
d) All of the above
Answer: d) All of the above
Explanation: The respiratory system is involved in gas exchange, regulation of pH through carbon dioxide removal, and vocalization.
7. Where are your lungs located?
a) In the abdominal cavity
b) In the thoracic cavity
c) In the cranial cavity
d) In the pelvic cavity
Answer: b) In the thoracic cavity
Explanation: The lungs are situated in the thoracic (chest) cavity, protected by the rib cage.
8. Most of the carbon dioxide produced in the tissues is transported to the lungs as:
a) Bicarbonate ions (HCO3-)
b) Oxygen (O2)
c) Carbon monoxide (CO)
d) Nitrogen (N2)
Answer: a) Bicarbonate ions (HCO3-)
Explanation: Carbon dioxide produced in tissues combines with water to form bicarbonate ions, which are transported in the blood to the lungs for removal.
9. Which of the following parts of the brain regulates the respiratory process?
a) Cerebrum
b) Cerebellum
c) Medulla oblongata
d) Hypothalamus
Answer: c) Medulla oblongata
Explanation: The medulla oblongata in the brainstem controls involuntary processes like breathing.
10. Which of the following is a chronic respiratory disorder caused by smoking?
a) Asthma
b) Bronchitis
c) Emphysema
d) Pneumonia
Answer: c) Emphysema
Explanation: Emphysema is a chronic obstructive pulmonary disease (COPD) often caused by smoking, characterized by damage to the alveoli in the lungs leading to breathing difficulties.