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Bihar Board Class 12 Biology Important Questions 2026
can introduce you to a variety of questions for different marks. You can start practicing these questions after completing the syllabus. In the exam, you will get 96 questions, for which internal choices will be available in the question paper. In total, you will have to answer questions for 70 marks. The questions will be divided into sections A and B. The section A will include 35 MCQs and section B will consist of short questions as well as long questions. The questions will be of 1, 2, and 5 marks. Read the article carefully to know the important questions for different marks. By regularly practicing answers for these questions, you can score good marks in board exams. Go through the questions for different marks given below in the article.
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Bihar Board Class 12 Biology Syllabus 2025-26
Bihar Board Class 12 Biology Important Questions 2026 of 1 Mark
Following are the important questions for 1 mark. These questions are included in the first section of the question paper. The questions mentioned below are taken from the previous year question papers.
Q1. Which of the following is not a chromosol disorder?
(A) Down’s syndrome
(B) Klinefelter’s syndrome
(C) Turner’s syndrome
(D) Phenyl ketonuria
Q2. The flour of Idli and Dosa is made by the use of which microbe?
- Bacteria
- Lactobacillus
- Virus
- Yeast
Q3. Which of the following statements is incorrect about temperature?
(A) Temperature is the most important environmental factor
(B) Temperature decreases from the equator towards the pole
(C) Temperature increases with increase in height
(D) Temperature is low at the summit of a mountain
Q4. Which of the following scientists prepared recombination map?
(A) Mendel
(B) Sturtevant
(C) Sutton and Boveri
(D) Morgan
Q5. When percentage of individuals of pre-reproductive, reproductive and post-reproductive phase is in decreasing order in the age pyramid of human population, it shows that population is (A) Expanding
(B) Decreasing
(C) Stable
(D) Unstable
Q6. Due to which of the following reasons there is approximately equal distance maintained between two polynucleotide strands of DNA?
(A) Backbone of each polynucleotide chain is constituted by phosphate sugar.
(B) Both polynucleotide strands have antiparallel polarity.
(C) The bases in the two strands are paired through hydrogen bonds forming base pairs.
(D) In DNA purine comes opposite to pyrimidine.
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Bihar Board Class 12 Biology Exam Pattern 2026
Bihar Board Class 12 Biology Important Questions 2026 of 2 Mark
Practice writing answers for the important questions given here from the previous year question papers. Each question carries 2 marks in board exams. You will get choices in questions. Out of 20 questions, you will have to attempt any 10 questions.
Q1. What are sacred groves, where are they found and what is their significance?
Q2. Draw a neat and well-labelled diagram of transverse section of human ovary.
Q3. How is the name given to restriction endonucleases?
Q4. How is nomenclature of restriction endonucleases done?
Q5. Discuss various methods of contraception for the population control.
Q6.
What is biofertilizer and what are its sources?
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Bihar Board Class 12 Biology Model Paper 2025-26
Bihar Board Class 12 Biology Important Questions 2026 of 5 Mark
In the exam, you will have to answer any 3 questions for 5 marks. Practice writing lengthy answers for these questions. Ensure you add all the relevant points in the answer to score good marks.
Q1. What is megasporogenesis? describe the development of megaspore.
Q2. What is pisciculture? Mention its role in the enrichment of our food.
Q3. Answer the following questions :
(A) Stability of DNA is higher than that of RNA. How ?
(B) What are the roles of three parts of transcription unit?
Q4. Define in situ conservation. What has been done for in situ conservation?
Q5. Write short notes on the following :
(A) Phosphorus cycle
(B) Primary immunity.
Which chapters have more weightage in Bihar Board Class 12 Biology?
Out of 5 units in the Bihar Board syllabus, 3 units are provided with 18 marks. You should prepare these units in-depth to answer the questions properly.
- Unit 2 - Genetics and Organic Evolution
- Unit 3 - Biotechnology and its applications
- Unit 4 - Applied biology and human welfare
All these units should be prepared well in order to answer all questions in the board exams. You will find multiple choice questions, short answer questions and long answer questions from the topics mentioned above. Keep visiting the page to get the latest questions and practice writing answers for them. Regular practice will give you a good knowledge about the types of questions asked in the exam.
FAQs
You should first understand the question, then check the marks allotted to the question. As per the marks, you can decide the length of answers. Accordingly, add relevant points in each of the answers and provide a clear explanation.
After completing the syllabus, you can focus on solving the important questions for the Bihar Board Class 12 Biology 2026 exam. Solving all short and long questions will help you to write answers as per the marks allotted to the questions.
In the Bihar Board Class 12 Biology exam 2026, the question paper will include 2 sections. Section A will include 35 objective type questions. Each question will be of 1 mark. You will get choices in this part. Out of 70 questions, you will have to attempt any 35 questions.
The questions in important questions and model papers are taken from the previous year question papers. So, you should prepare the questions carefully as these questions might appear in your board exams. The questions can also be asked in a different format. Try to recognize them and answer accordingly.
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