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
Which ion is mostly reabsorbed in the Proximal Convoluted Tubule (PCT)?
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.
About 65% of sodium is reabsorbed in PCT along with water and nutrients.
Final Answer: Option C — Sodium