CSIR NET December 2025 Answer Key LIVE Updates: Life Sciences Exam Analysis, Topics Asked, Difficulty Level
New Delhi | Education Desk | Updated: December 25, 2025
The National Testing Agency (NTA) is expected to release the CSIR NET December 2025 provisional answer key soon on the official website csirnet.nta.nic.in. While candidates await the official answer key, detailed exam analysis and student feedback for the Life Sciences paper has started emerging, offering valuable insights into topic-wise weightage, difficulty level, and good attempt benchmarks.
The CSIR NET December 2025 examination was conducted in Computer-Based Test (CBT) mode across multiple centres on December 18, 2025, for eligibility to Junior Research Fellowship (JRF) and Assistant Professor/Lectureship in science disciplines.
CSIR NET 2025 Life Sciences: Topic-Wise Questions Asked
Based on student reactions and expert review, the Life Sciences paper in the December 2025 session showed a Botany-dominant trend, particularly in Part C.
High-Weightage Topics
- Plant Physiology: High weightage with 10–12 questions, mostly in Part C
- Developmental Biology: Multiple questions from
- Drosophila
- Asymmetric division in plants
- Leaf development
Moderate Weightage Areas
-
Evolution:
- Era-based classification
- r- and K-selection
- Order of mass extinction events
-
Classification & Taxonomy:
- Animal classification
- Symmetry comparison between Annelida and Platyhelminthes
Important Technique-Based Questions
Techniques played a crucial role, especially in Part C:
- TAL Effector
- CDK-2
- Ramachandran Plot
Other Topics Covered
-
Cell Biology:
- GLUT-5
- Ribosome-attached endoplasmic reticulum
- Spindle assembly (γ-tubulin)
-
Genetics:
- RNA Polymerase II in lagging strand
- Differences between Bacteria and Archaebacteria
-
Immunology / Virology:
- Question from HPV virus
Notably, Cell Signaling and Molecular Biology were largely absent from the paper, as reported by several candidates.
CSIR NET 2025 Life Sciences: Section-Wise Exam Analysis
The Life Sciences paper follows a three-part structure: Part A, Part B, and Part C.
Section-Wise Breakdown
| Part | Total MCQs | MCQs to Attempt | Difficulty Level | Good Attempts |
|---|---|---|---|---|
| Part A | 20 | 15 | Moderate | 10–12 |
| Part B | 50 | 35 | Moderate to Difficult | 25–28 |
| Part C | 75 | 25 | Moderate to Difficult | 18–19 |
| Total | 145 | 75 | Moderate to Difficult | 55–58 |
Overall, candidates with 55–58 correct attempts are expected to be in a competitive position, subject to normalization and cut-off trends.
Difficulty Level: Student Feedback
-
Part A:
- Generally rated easy to moderate
- Questions were predictable, focusing on reasoning, numerical ability, and basic aptitude
-
Part B:
- Considered moderate
- Balanced mix of conceptual and factual questions
-
Part C:
- Widely regarded as the most difficult section
- Required deep conceptual understanding and application
- Dominated by Plant Physiology, Developmental Biology, Techniques, and Evolution
Sample Questions Reported by Candidates
Some of the questions recalled by candidates include:
- A fills a tank in 45 minutes, B in 120 minutes. How long will they take together?
- Cube of 0.99 is closest to which value?
- Correct sequence of geological eras: Archeozoic, Proterozoic, Phanerozoic
- Arrange DNA replication enzymes in correct order:
DNA Gyrase → Helicase → Primase → DNA Pol III → DNA Pol I → Ligase - Differences between Bacteria and Archaebacteria
CSIR NET 2025 Life Sciences: Exam Pattern Recap
| Particulars | Part A | Part B | Part C | Total |
|---|---|---|---|---|
| Total Questions | 20 | 50 | 75 | 145 |
| Max Attempts | 15 | 35 | 25 | 75 |
| Marks per Question | 2 | 2 | 4 | 200 |
| Negative Marking | 0.5 | 0.5 | 1 | — |
Negative marking of 25% applied across all sections.
CSIR NET 2025: Shift Timings
The examination was conducted in two shifts:
| Event | Shift 1 | Shift 2 |
|---|---|---|
| Exam Timing | 9:00 AM – 12:00 PM | 3:00 PM – 6:00 PM |
| Reporting Time | 7:00 – 8:00 AM | 1:00 – 2:00 PM |
Answer Key and Objection Process
Once released, candidates will be able to:
- download the provisional answer key
- access their recorded response sheet
- calculate tentative scores
The NTA will also open an objection window for a limited period. Candidates can challenge any incorrect answer by submitting:
- valid academic references
- supporting documentary evidence
All objections will be reviewed by subject experts. Based on accepted challenges, the final answer key will be released, followed by the CSIR NET December 2025 result.
What Candidates Should Do Now
Candidates are advised to:
- regularly check csirnet.nta.nic.in
- analyze performance using topic-wise feedback
- be prepared for the objection window
- rely only on official NTA updates
CSIR NET December 2025 answer key LIVE updates. Check Life Sciences exam analysis, topic-wise questions, difficulty level, good attempts, and answer key details at csirnet.nta.nic.in.
CSIR NET December 2025 answer key
CSIR NET Life Science exam analysis
CSIR NET 2025 topics asked
CSIR NET Life Science good attempts
csirnet.nta.nic.in answer key
CSIR NET objection window
Post a Comment