NEET UG 2021 · Zoology · Question 198
NEET 2021 Zoology, question 198
Question 198 of the NEET 2021 paper (code O1) is a Zoology question from Biotechnology and its Applications. Its idea, ADA Role in Immune System, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q198 · Zoology
The Adenosine deaminase deficiency results into :
- 1Digestive disorder
- 2Addison's disease
- 3Dysfunction of Immune systemOfficial answer
- 4Parkinson's disease
Official answer: option 3 · NTA final answer key
Same idea
The only question on ADA Role in Immune System
No other NEET paper from 2017–2026 tested this exact idea.
ADA Role in Immune System: every question and how it was framed
The chapter
Biotechnology and its Applications in ten years of NEET
24 questions from 2017–2026, asked in 9 of 10 papers, about 2.3 a paper. Gene Therapy alone had 8.