CBSE Class 12 Biology Answer Key 2026 (Out)- All Sets Solved Question Paper PDF Download, Exam Analysis

CBSE Class 12 Biology Answer Key 2026 has been released. The Central Board of Secondary Education (CBSE) conducted the Class 12 Biology on March 27, 2026. The exam was held in a single shift, from 10:30 am to 1:30 pm. We have released an unofficial answer key here for Section A (MCQs) of CBSE Class 12 Biology. To pass the CBSE 12th exam along with the subject, you must get a minimum of 33% marks in aggregate marks as per the CBSE Class 12 Passing Marks 2026 . The 3-hour Biology paper contains 33 questions, where all questions are compulsory with some internal choices. Section A has multiple-choice type questions, which are all compulsory. CBSE is expected to release the Class 12 results in the second week of May 2026. Read the article below to know more on CBSE Class 12 Biology Answer Key 2026.

CBSE Class 12 Biology Unofficial Answer Key 2026

Here we will provide you with the objective answers only. The tables below for Section A will be updated for all the sets as soon as the CBSE Class 12 Biology exam is concluded:

Section A - Multiple Choice Questions (Set 1)

Q. No.	Question	Answer
1	Identify the plant in which emasculation is not required for artificial hybridization.	(D) Papaya (It is dioecious/unisexual)
2	Which of the following is not a component of immune system?	(C) Red Blood Cells
3	Select the option that shows correct statements: (i) Corpus luteum secretes progesterone. (ii) Only FSH attains peak level in middle of cycle. (iii) LH surge induces rupture of graafian follicle. (iv) Luteal phase is also called proliferative phase.	(B) (i) and (iii) are correct
4	Select the mismatched pair:	(B) Genetically different strains of rice in India – Less than 1000 (It is >50,000)
5	Pomato was produced by fusing protoplasts of:	(A) Tomato and Potato
6	In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______.	(A) Stratification
7	Which of the following sacred groves is found in Meghalaya?	(A) Jaintia hills
8	In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which phenomena is expressed?	(B) Independent assortment of pairs
9	Match Column-I (Biolistic gun, Chitinase, Ti, Ca++) with Column-II (Bacterial, Tumor inducing, Animal, Fungal, Plant cell).	(C) a–v, b–iv, c–ii, d–i
10	The idea of use and disuse of organs for evolution of organism was proposed by:	(D) Lamarck
11	Which of the following statements about plasmids is incorrect?	(B) Their replication is controlled by chromosomal DNA
12	Which connective tissue connects ovary to pelvic wall and uterus?	(B) Ligaments
13	Assertion (A): Population of melanized moths increased in industrial areas. Reason (R): Soot-covered trees offered better camouflage to dark moths.	(A) Both A and R are true and R is the correct explanation of A.
14	Assertion (A): Milk from transgenic cow ‘Rosie’ was more nutritionally balanced. Reason (R): It contained human protein α-lactalbumin.	(A) Both A and R are true and R is the correct explanation of A.
15	Assertion (A): Flocs are masses of bacteria associated with fungal filaments. Reason (R): Flocs help in digestion of solid waste by anaerobic respiration.	(C) Assertion (A) is true, but Reason (R) is false (Flocs use aerobic respiration).
16	Assertion (A): In terrestrial ecosystem much larger fraction of energy flows through grazing food chain. Reason (R): Grazing food chain may be connected to detritus food chain.	(D) Assertion (A) is false (DFC is major), but Reason (R) is true.

Section A - Multiple Choice Questions (Set 2)

Question Number	Questions	Correct Answers
1	TBU	TBU
2	TBU	TBU
3	TBU	TBU
4	TBU	TBU
5	TBU	TBU
6	TBU	TBU
7	TBU	TBU
8	TBU	TBU
9	TBU	TBU
10	TBU	TBU
11	TBU	TBU
12	TBU	TBU
13	TBU	TBU
14	TBU	TBU
15	TBU	TBU
16	TBU	TBU

Section A - Multiple Choice Questions (Set 3)

Question Number	Questions	Correct Answers
1	TBU	TBU
2	TBU	TBU
3	TBU	TBU
4	TBU	TBU
5	TBU	TBU
6	TBU	TBU
7	TBU	TBU
8	TBU	TBU
9	TBU	TBU
10	TBU	TBU
11	TBU	TBU
12	TBU	TBU
13	TBU	TBU
14	TBU	TBU
15	TBU	TBU
16	TBU	TBU

CBSE Class 12 Biology Question Paper Pattern 2026

You can check out the latest CBSE Class 12 Biology Question Paper Pattern for the academic session 2025-2026 as pointed out below:

• The CBSE Class 12 Biology theory exam is for 70 marks, and 30 marks are for the practical exam.
• The 70-mark theory paper is conducted for 3 hours, during which 15 minutes are given for reading the question paper.
• A total of 33 questions are there in the CBSE Class 12 Biology question paper.
• Question paper comprises 5 sections - Section A, B, C, D, and E.
• There is no overall choice. However, internal choices have been provided in some questions.
• Section A contains question numbers 1 to 16 that are multiple-choice type questions. Each question carries 1 mark.
• In Section B, question numbers 17 to 21 are very short-answer type questions. Each question carries 2 marks.
• In Section C, question numbers 22 to 28 are short-answer type questions. Each question carries 3 marks.
• In Section D, question numbers 29 and 30 are case-based questions. Each question carries 4 marks.
• In Section D, each question has subparts with an internal choice in one of the subparts.
• Section E has question numbers 31 to 33 that are long-answer type questions. Each question carries 5 marks.

CBSE Class 12 Result 2026

The Central Board of Secondary Education is expected to release the CBSE Class 12 Result 2026 in May 2026. You can find the results on the official website. If you are unable to check the result online, then you can use the SMS service. The result will have important information regarding the total number of marks that you have obtained in the different subjects, along with the grades that you have achieved in them. CBSE has decided not to release any percentage or ranks to avoid unfair competition between peers. You can get the marksheet from your respective school premises after a few days of the result declaration.

CBSE Class 12 Biology Passing Marks 2026

The minimum passing marks for CBSE class 12 are 33%. You can check out the subject-wise and stream-wise passing marks from the table given below:

CBSE Class 12 Grading System 2026

You can check out the CBSE Class 12 Grading System 2026 from the table given below:

Knowing the unofficial CBSE Class 12 Biology Answer Key 2026 will help you in your mark estimation. You can easily check your objective answers with the answers provided here and can calculate your score before the declaration of the CBSE Class 12 Result 2026 .