Digestive & Respiratory System MCQ Quiz – Part 5
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This Digestive & Respiratory System MCQ Quiz helps aspirants revise important concepts related to the structure and functions of the human digestive and respiratory systems, which are frequently asked in competitive exams. Regular practice of these MCQs improves conceptual understanding and helps candidates answer biology questions quickly and accurately.
GK Series – Biology – Digestive & Respiratory System MCQ Quiz |
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| Subject | Biology |
| Chapter | Digestive & Respiratory System |
| Part | 5 |
| Questions | 6 |
Who Should Attempt This Digestive & Respiratory System MCQ Quiz?
This Digestive & Respiratory System MCQ Quiz is useful for aspirants preparing for SSC, Railways, Banking, Defence, and other government job exams, where basic biology questions are commonly asked in the General Knowledge section.
Topics Covered in This Digestive & Respiratory System MCQ Quiz
This quiz includes MCQs based on important topics such as organs of the digestive system, digestion and absorption of food, structure and functions of the respiratory system, breathing mechanism, and gas exchange, along with other fundamental concepts related to human digestion and respiration.
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Question 1 of 6
1. Question
The Krebs cycle takes place in the
Correct
➤ The Krebs cycle (Citric Acid Cycle) occurs in the mitochondria.
➤ It breaks down pyruvate and releases carbon dioxide and energy carriers.Incorrect
➤ The Krebs cycle (Citric Acid Cycle) occurs in the mitochondria.
➤ It breaks down pyruvate and releases carbon dioxide and energy carriers. -
Question 2 of 6
2. Question
The electron transport chain (ETC) occurs in the
Correct
➤ The Electron Transport Chain occurs in the inner mitochondrial membrane.
➤ It produces the major portion of ATP during cellular respiration.Incorrect
➤ The Electron Transport Chain occurs in the inner mitochondrial membrane.
➤ It produces the major portion of ATP during cellular respiration. -
Question 3 of 6
3. Question
The final electron acceptor in aerobic respiration is
Correct
➤ Oxygen acts as the final electron acceptor in aerobic respiration.
➤ It combines with electrons and hydrogen to form water.Incorrect
➤ Oxygen acts as the final electron acceptor in aerobic respiration.
➤ It combines with electrons and hydrogen to form water. -
Question 4 of 6
4. Question
NADH mainly functions to
Correct
➤ NADH is a coenzyme that transports electrons.
➤ It transfers electrons to the electron transport chain for ATP production.Incorrect
➤ NADH is a coenzyme that transports electrons.
➤ It transfers electrons to the electron transport chain for ATP production. -
Question 5 of 6
5. Question
Most ATP molecules in aerobic respiration are produced during the
Correct
➤ Most ATP is produced during the Electron Transport Chain.
➤ This stage generates about 34 ATP molecules in aerobic respiration.Incorrect
➤ Most ATP is produced during the Electron Transport Chain.
➤ This stage generates about 34 ATP molecules in aerobic respiration. -
Question 6 of 6
6. Question
Through which organ do fish respire?
Correct
➤ Fish respire using gills.
➤ Gills extract dissolved oxygen from water.Incorrect
➤ Fish respire using gills.
➤ Gills extract dissolved oxygen from water.