CSIR NET 2025 Dec Life & Earth Science (Shift 1) Question Paper Analysis OUT, Answer Key, Expected Cutoff

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 was 145, and candidates need to attempt 75 questions where as in Earth Science, total questions asked were 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.

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 was Moderate to Difficult. 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.

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.

Also Read: 

CSIR NET 2025 Syllabus

CSIR NET December Earth Science Exam Analysis 2025 OUT

As per the students feedback, the overall difficulty of the exam was Moderate. Part A and Part B questions were moderate in nature and Part C was difficult. The expected number of good attempts can be 55 to 58.

Topics asked from Part B

• Paleontology basics
• Geomorphology and Stratigraphy
• Geology fundamentals, Mineralogy, petrology, structural geology
• Geochemistry and geophysics fundamentals
• Oceanography and atmospheric processes
• Remote sensing or GIS basics, etc.

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.

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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CSIR NET 2025 Exam Pattern

CSIR NET 2025 Dec Maths, Chemical and Physical Science (Shift 2) Question Paper Analysis