5 public questions tagged with this topic.
The distal convoluted tubule regulates pH balance by selectively secreting hydrogen ions and reabsorbing bicarbonate ions.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Nephron Structure - Tubules PCT Loop of Henle DCT Collecting Duct
The distal convoluted tubule helps in maintaining the acid-base balance by selectively secreting hydrogen ions.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Nephron Structure - Glomerulus and Bowmans Capsule
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
Carbonic acid-bicarbonate buffer is the scientifically accurate answer to this question. Within the study of pH and Buffer, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Carbonic acid-bicarbonate buffer directly address what is being asked. Among the other options, Acetic acid buffer, Ammonium buffer, and Phosphate buffer 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. 2
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.
