Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ - decoded step-by-step.
Solve it the standard way once - then learn the shortcut.
Q · Excretory Systemmedium · 45s
Osmoregulation and blood volume control are primarily managed by:
TopicExcretory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
The kidneys adjust water and solute excretion. ADH modulates water permeability of collecting ducts, while the renin–angiotensin–aldosterone system regulates Na⁺ and water retention, maintaining plasma osmolarity and volume.
Final Answer: Option A - Kidneys and ADH