CSIR NET 2025 Dec Life & Earth Science (Shift 1) Question Paper Analysis OUT, Answer Key, Expected Cutoff
Council of Scientific and Industrial Research National Eligibility Test 2025 ( CSIR NET )
Exam On - 18 Dec '25
CSIR NET 2025 December Session Question Paper Analysis is available here for the exam conducted on December 18 in the first shift from 9 am to 12 noon for subjects Life and Earth Science. Scroll down to know about the overall difficulty level, topics asked, memory-based questions, answers, and expected cutoff for subjects Life Science and Earth Science.
CSIR NET 2025 Dec Life & Earth Science (Shift 1) Question Paper Analysis
CSIR NET 2025 Dec Life & Earth Science Anaysis OUT: The National Testing Agency (NTA) conducted the CSIR UGC NET 2025 exam for the December session on December 18 for subjects Life Science and Earth Science in the first shift. It was started at 9 am and concluded at 12 noon. Candidates can predict, regarding the cutoff, whether it will rise or drop with the help of analysis. The total number of questions asked in the Life Science exam is 145, and candidates need to attempt 75 questions where as in Earth Science, total questions asked are 150 and candidates required to attempt 75 questions. The CSIR NET Exam (Life Science & Earth Science) is divided into three parts, namely Part A, Part B, and Part C. Candidates can check below the detailed CSIR NET 2025 Dec Life & Earth Science exam analysis based on the student reactions, overall difficulty level, topics asked, memory-based questions and answers, etc.
Also Read: CSIR NET 2025 Dec Exam Analysis Live Updates
- CSIR NET December Life Science Exam Analysis 2025 OUT: Student Reactions & Topics asked (Shift 1, Dec 18)
- CSIR NET Section-Wise Analysis: Dec Life Science (Shift 1)
- CSIR NET Section-Wise Analysis: December Earth Science (Shift 1)
- CSIR NET 2025 Dec Answer Key
CSIR NET December Life Science Exam Analysis 2025 OUT: Student Reactions & Topics asked (Shift 1, Dec 18)
As per the students' the Life Science exam overall difficulty is Moderate to Tough. Development Biology and Ecology was easy. Plant Physiology was tough.
- Geological Time Scale: Easy
- Stress Physiology
- Nest Limb Development
- Also, as per some students, section B was easy.
- Majority of the Part C questions were asked from Plant Physiology and Development Biology around 10 to 12 Questions. It is Botany dominant paper.
- Questions were not asked from Cell Signaling and Molecular Biology
- Especially in Part B and C, Techniques and Evolution were present in decent volume
- Part A as per students was easy and questions were predictable in reasoning and quant-based
- Part C was most difficult with conceptual application as per some students.
The CSIR NET exam consists of five subjects some of them are Maths, Physical Science, Chemical Science, etc. Part A in the exam is common for all candidates and Part B and C is subject-specific. Candidates need to select one subject and prepare well to clear the examination.
CSIR NET 2025 Dec Life Science Analysis: Questions Asked
- A hand pump fills a tank in 45 minutes, B in 120 minutes. How much time will they take together to fill the tank? (Work and Time Questions)
- Cube of 0.99 is closed to? (Numerical Approximation)
- Ecology-Sequence of Proterozoic, Archeozoic, Phanerozoic Eras
- Genetics- Difference between Bacteria and Archaebacteria
- Arrange in correct order: DNA Gyrase, DNA Helicase, DNA Primase, DNA Pol 3, DNA Pol 1, DNA Ligase, etc.
Life Science topic-wise questions asked:
- Plant Physiology: High Weightage (10-12 Questions) asked in part C
- Cell Biology few questions asked from GLUT 5, Ribosome attached ER, Spindle Assembly-gamma tubulin
- Development Biology Multiple Questions asked from Drosophila, Asymmetric Division-Plants, Leaf Development
- Evolution moderate weightage and questions were asked from Era-based classification, K & r Selection, mass Extinction Order
- Techniques is of high relevance and questions asked from TAL Effector, CDK-2, Ramachandran Plot
- Genetics few questions were asked from Poll 2 in Lagging Strand, difference between bacteria and Archaebacteria
- Immunology/ Virology question from HPV Virus
- Classification & taxonomy moderate in difficulty level and questions asked from animal classification, Annelida vs Platyhelminthes Symmetry
CSIR NET Section-Wise Analysis: Dec Life Science (Shift 1)
Candidates can check the CSIR NET 2025 Dec Life Science Analysis for Shift 1 in the table below based on the students' review.
| Part Name |
Total MCQs |
Total MCQs to be Attempted |
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 |
Also Read:
CSIR NET Section-Wise Analysis: December Earth Science (Shift 1)
Candidates can check the CSIR NET 2025 Dec Earth Science Analysis for Shift 1 in the table below based on the students' review.
| Part Name |
Total MCQs |
Total MCQs to be Attempted |
Difficulty Level |
Good Attempts |
|---|---|---|---|---|
| Part A |
20 |
15 |
to be updated here |
to be updated here |
| Part B |
50 |
35 |
to be updated here |
to be updated here |
| Part C |
80 |
25 |
to be updated here |
to be updated here |
| Total |
150 |
75 |
to be updated here |
to be updated here |
CSIR NET 2025 Dec Answer Key
The National Testing Agency (NTA) will release the CSIR NET Dec Answer Key 2025 one week after the exam was concluded. Candidates will be able to raise objections against the CSIR UGC NET Provisional Answer Key by using their login credentials into the official website for a specific time period. The Answer Key of CSIR NET will be available in the PDF format. After releasing the final answer key, CSIR NET Result & Cut-off will soon be published by NTA.
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Student Forum
Anything you would want to ask experts?Answered a week ago
The CSIR NET 2025 exam will be conducted on December 18 in two shifts. As per the schedule released, the Mathematical Science exam will be held from 3 pm to 6 pm on Dec 18.
I
Contributor-Level 6
Answered 2 weeks ago
The CSIR NET 2025 Notification was released on September 25 in the form of PDF at csirnet.nta.nic.in. The notification conists if the important information related to the exam like exam dates, syllabus, pattern of an exam, etc.
G
Contributor-Level 6
Answered a month ago
The National Testing Agency declare the CSIR NET Cut off. It will be released subject and category-wise. The cut off is prepared on the basis of several factors including difficulty of the exam, reservation norms, number of candidates, etc.
K
Contributor-Level 6
Answered a month ago
Some of the topics that a candidate can revise in the CSIR NET Chemical Science subject:
Organic Reactive Intermediates: Carbocation, Carbanions, Free Radicals, Benzynes
Stereochemistry: Stereogenicity, Stereoselectivity, Enantioselectivity
Organic Reaction Mechanisms
Pericyclic Reactions
Structure Dete
S
Contributor-Level 10
Answered a month ago
The authority will release the CSIR NET 2025 result for the December session on the official website at csirnet.nta.nic.in. It will contain the name of a candidate, roll number, category, parents' name, Post applied (JRF and Assistant Professor or Assistant Professor Only), subject code, etc.
G
Contributor-Level 6
Answered a month ago
The authority will release the CSIR NET answer key at csirnet.nta.nic.in. It contains correct answers for all the questions asked in the exam. Check below for more details:
Exam name | Exam date |
Exam shift | Exam subject name |
Exam subject code | Question IDs |
Correct option IDs | - |
V
Contributor-Level 6
Answered a month ago
The CSIR NET 2025 final answer key will be released on the official website at csirnet.nta.nic.in. After analysing the representations of the aspirants, the NTA will release the CSIR UGC NET final answer key for the Dec session. The answer key will be released in two phases- Provisional and Final.
N
Contributor-Level 6
Answered a month ago
Candidates can calculate the CSIR NET Chemical Sciences scores through the answer key in the following manner.
CSIR NET Chemical Science Paper Parts | Marks Allotted for Each Question | Marks Deducted for Each Question |
|---|---|---|
A | +2 | -0.5 |
B | +2 | -0.5 |
C | +4 | -1 |
K
Contributor-Level 6
Answered a month ago
As per the information bulletin, the upper age limit for the CSIR NET exam should not be more than 30 years as on the first day of the month in which the examination is concluded. A relaxation of upto 5 years is provided to the candidates belonging to OBC-NCL (as per the Central list of OBC) /SC/ST/
M
Contributor-Level 6
Answered a month ago
The authority released the CSIR NET 2025 application form at csirnet.nta.nic.in. The last date to apply was October 27. Candidates who are interested in appearing the exam, need to fill the application form by providing all the details as asked.
C
Contributor-Level 6
Yes. Candidates clear the CSIR UGC NET exam in three months. But to pass the exam proper strategy is required. They make study plans, do revisions, solve question papers, practice tests, etc. If a candidate study properly then nothing is impossible to crack.