Bihar Board 2026 Class 12th Biology Unofficial Answer Key: The Bihar School Examination Board (BSEB) has officially commenced the 2026 Intermediate Annual Examinations today, February 2, 2026. Approximately 13.18 lakh students began their Class 12 (Intermediate) exams at 1,762 centres across the state. As per the official schedule, the Bihar Board Class 12 Biology Examination 2026 was held today, from 9:30 AM to 12:45 PM. BSEB Class 12 Biology exam 2026 follows a 100-mark assessment structure, split between a 70-mark theory paper and a 30-mark practical exam. Students who appeared for the Bihar Board Class 12 Biology Theory Examination 2026 can check the Bihar Board 2026 Class 12th Biology Unofficial Answer Key available here.
Also Read:
- Bihar Board 12th Economics Unofficial Key 2026: Question Paper Detailed Analysis
- Bihar Board 2026 Exam Begins from February 2: Important Guidelines, Reporting Time
Bihar Board 2026 Class 12th Biology Unofficial Answer Key
Students can check the BSEB 2026 Class 12th Biology Unofficial Answer Key available in the table below.
| Bihar Board 2026 Class 12th Biology Questions | Bihar Board 2026 Class 12th Biology Answers |
| Question 1: If a person's blood group is AB, what would be his/her genotype? | I^A I^B |
| Question 2: How many types of gametes would be formed if the genotype of plant is AaBbCc ? | Eight |
| Question 3: Which of the following is not a chromosomal disorder ? | Haemophilia |
| Question 4: In which of the following animals does sex determination depend on the number of chromosome sets? | Honeybees |
| Question 5: Which of the following laws are based on monohybrid cross? | both A and B |
| Question 6: Fossils are found in which type of rocks? | sedimentary rocks |
| Question 7: Which of the following are examples of homologous organs in animals? | Homologous organs |
| Question 8: Which of the following was more like an ape? | Dryopithecus |
| Question 9: Which of the following enzymes allows lactose to enter the bacterial cell? | Permease |
| Question 10: Who stated that in double stranded DNA sum of purine nitrogenous bases is equal to the sum of pyrimidine nitrogenous bases? | Erwin Chargaff |
| Question 11: A typical nucleosome....... | Both A and B |
| Question 12: What did Hershey and Chase conclude on the basis of their experiments? | DNA from the virus enters the bacteria |
| Question 13: What is the process of removal of introns and mutual joining of icatic nexons called? | splicing |
| Question 14: Which of the following statements is incorrect about the code ? | All 64 codons code for amino acids |
| Question 15: How many mega-biodiversity countries are there in the world ? | 17 |
| Question 16: Which region got comparatively shorter span of time for species evolution and diversification due to frequent glaciation ? | Temperate regions |
| Question 17: Which is called the lungs of the earth ? | The Amazon Rainforest |
| Question 18: Which of the following species became extinct due to over- exploitation ? | Passenger pigeon |
| Question 19: Which of the following is not the primary consumer ecosystem ? | Grasshoppers |
| Question 20: How much percentage of photo-synthetically active radiation captured by plants ? | 2-10% |
| Question 22: What is the raw material for decomposition called ? | detritus |
| Question 23: What is secondary consumer called ? | primary carnivores |
| Question 24: What are those called which obtain energy and breaking dead organic matter or detritus ? | detritivores |
| Question 25: Which of the following is the pollinating agent of Ophrys ? | a species of bee |
Bihar Board 2026 Class 12th Biology: Question Paper Analysis
Students can access the Bihar Board 2026 Class 12th Biology Exam Analysis from the table below.
| Particulars | Details |
| Bihar Board 2026 Class 12th Biology Overall Difficulty Level | Easy to Moderate |
| Was the Paper Lengthy? | Yes |
| Number of Good Attempts | to be updated |
| Important Topics Asked | to be updated |
The Bihar Board 2026 Class 12th Biology Unofficial Answer Key is prepared by the subject-experts. Students are advised to use the above unofficial answer key to evaluate their performances. Unofficial answer keys are typically released by private coaching institutes and subject experts within a few hours of the exam's conclusion to help students estimate their scores.