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CBSE 12th Class Biology Answer Key 2026 PDF (All Sets)
The CBSE Class 12 Biology exam for the 2025-26 session was held on March 27, 2026. The paper was conducted from 10:30 AM to 1:30 PM. After the exam, the different coaching institutes released the CBSE 12th Biology answer key online. These Class 12 Biology answer key sessions run on different YouTube channels and websites. Students can check those CBSE Class 12 Biology answers from this page as well.
CBSE 12th Biology Answer Key Released: Check Here
This Story also Contains
- Download CBSE 12th Biology Answer Key 2026
- How can I calculate the score using the answer key?
- CBSE 12th Exam Pattern 2026 & Marking Scheme
- CBSE 12th Biology 2026 High Priority Chapters
Download CBSE 12th Biology Answer Key 2026
The CBSE Class 12 Biology exam includes a variety of question types such as Multiple Choice Questions (MCQs), short answer questions, long answer questions, case-based or competency-based questions, and diagram-based questions. We will provide the answers to these CBSE 12th questions on this page.
How can I calculate the score using the answer key?
To estimate the marks, follow the CBSE 12th marking structure:
Section A (MCQs): 1 mark for each correct option. There is no negative marking.
Step Marking: For Sections B, C, and E, CBSE provides step-wise marks. Even if the final answer is wrong, students can get marks for correct formulas, intermediate steps, or labelled diagrams.
Diagrams: In Biology, a correctly drawn but unlabeled diagram fetches lower marks. Ensure the labels match the NCERT standard.
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CBSE 12th Exam Pattern 2026 & Marking Scheme
The CBSE Class 12 paper carries 70 marks, with the remaining 30 marks coming from the practical examination. The question paper is divided into five sections:
Section A: 16 questions (MCQs and Assertion-Reason): 1 mark each.
Section B: 5 very short answer questions: 2 marks each.
Section C: 7 short answer questions: 3 marks each.
Section D: 2 case-based questions: 4 marks each.
Section E: 3 long answer questions: 5 marks each.
CBSE Class 12 Biology: Unit-Wise Weightage
| Unit No. | Unit Name | Weightage (Marks) |
|---|---|---|
VI | Reproduction | 16 |
VII | Genetics and Evolution | 20 |
VIII | Biology and Human Welfare | 12 |
IX | Biotechnology and Its Applications | 12 |
X | Ecology and Environment | 10 |
Total | 70 |
CBSE 12th Biology 2026 High Priority Chapters
Focusing on these chapters will help to secure maximum marks as they often contain high-weightage derivations and diagrams:
Molecular basis of inheritance: Heavy focus on DNA replication, transcription, and translation processes.
Genetics (Principles of Inheritance): Mastering Mendelian crosses and pedigree analysis is essential.
Human Reproduction: Requires precise diagrams of the reproductive systems and a clear understanding of the menstrual cycle.
Biotechnology - Principles and Processes: Understanding recombinant DNA technology and PCR.
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Download NowCBSE Class 12th Syllabus: Subjects & Chapters
Select your preferred subject to view the chapters
Frequently Asked Questions (FAQs)
Q: When will the Biology answer key be available?
A:
CBSE Class 12 Biology answer key will not release the official answer key. However, many subject experts and coaching teachers upload their solutions soon after the board exam ends.
Q: Can I challenge the answer key or apply for re-evaluation?
A:
Yes, after the CBSE results are announced in May, the board provides a window for:
Verification of Marks: A simple re-totalling of the score.
Obtaining a Photocopy: Students can request a digital copy of their evaluated answer sheet.
Re-evaluation: Students can challenge specific answers if they believe they were marked incorrectly in accordance with the official marking scheme.
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Questions related to CBSE Class 12th
On Question asked by student community
Have a question related to CBSE Class 12th ?
Hi Manish,
Here is the link of question paper
https://school.careers360.com/boards/cbse/cbse-class-12-english-question-paper-2025
Hi Aradhana
Here is the link of Question Paper
https://school.careers360.com/boards/cbse/cbse-class-12-supplementary-question-paper-2026
Hello Dear Student,
If you've passed Class 10 from CBSE and don't remember your registration number , you can retrieve it using one of these methods:
- Check your Class 10 admit card – the registration number is printed on it.
- Look at your school records – your school should have
Hello,
Yes, if you have passed Class 12 but wish to improve your Mathematics marks, you can apply for the CBSE Improvement Examination, subject to the eligibility criteria and registration schedule notified by CBSE. Please keep checking the official CBSE website for the latest notification regarding registration dates and examination
Hello Ananya,
Please specify the class for which you need the question papers. I am providing Class 10 and 12 papers.
Here are the links to the CBSE Half-yearly Question Papers (2025-2026).
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