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The vasa recta maintains the osmotic gradient necessary for water reabsorption and urine concentration.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Concentration of Urine - Counter Current Mechanism
The vasa recta maintains the counter-current exchange system, helping in urine concentration.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Concentration of Urine - Counter Current Mechanism
Vasa recta (C) is the right choice. This sits at the heart of Excretory System: the wording points straight to what is happening in the tissue or organ system. A useful study habit is to ask what the structure or process is for: Vasa recta is the option that correctly names the structure, process, or principle asked for in Excretory System. That reasoning supports Vasa recta. One solid sentence about why this works is enough for recall — you do not need a long essay for every MCQ. When you practise, cover the choices first, write Vasa recta from memory, then reveal the letter — that habit builds real recall for Excretory System.
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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