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Carbonic anhydrase is an enzyme that catalyzes the reversible conversion of carbon dioxide and water into carbonic acid, which then dissociates into bicarbonate and hydrogen ions.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Transport of Carbon Dioxide and Regulation of Respiration
Carbonic anhydrase is an enzyme that catalyzes the conversion of CO₂ and water into carbonic acid, which dissociates into bicarbonate ions and H⁺.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Exchange of Gases and Transport of Oxygen
Zinc (Zn²âº) is the scientifically accurate answer to this question. Within the study of Enzymes Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Zinc (Zn²âº) directly address what is being asked. Among the other options, Iron (Fe²âº), Copper (Cu²âº), and Magnesium (Mg²âº) do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
The correct answer is C: Bicarbonate. In Excretory System, this idea is central because it matches how the body actually works in everyday teaching examples. Put simply, Bicarbonate is the option that correctly names the structure, process, or principle asked for in Excretory System. That is why Bicarbonate is the option that holds up when you check it against basic physiology. When you revise, say the answer out loud with one short reason attached; that sticks better than rote lists. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
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