CBSE Class 12 Biology Boards 2021 Sample Paper Solved

Biology
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Read and download the CBSE Class 12 Biology Boards 2021 Sample Paper Solved, designed by expert teachers according to the latest 2026-27 curriculum and examination pattern issued by CBSE, NCERT, and KVS. These Class 12 Biology sample papers include detailed step-by-step solutions, helping students to practice and evaluate their performance against the most recent marking schemes.

Practice Model Papers for Class 12 Biology

Want to know which chapters carry high marks? Working through our Class 12 Biology model papers helps you learn chapter weightage and expected test difficulty. Solving these guess papers enables Class 12 students to find weak spots and practice better time management. We also recommend checking our previous years' Class 12 Biology Question Papers for extra practice.

Biology Sample Papers for Class 12 (2026-27)

SECTION A
Questions Marks
1. Why does endosperm development precede embryo development?
 
2. How many meiotic divisions are required to produce 76 seeds in a Guava fruit? 
 
3. How does pollination take place in water hyacinth and water lily? 
 
4. Name the glands that contribute to human seminal plasma. 
 
5. A snapdragon plant with violet flowers was crossed with another such plant with white flowers. The F1 progeny obtained had pink flowers. Explain, in brief, the inheritance pattern seen in offsprings of F1 generation?
 
6. Differentiate between aneuploidy and polyploidy. 
 
7. Predict the effect if, the codon UAU coding for an amino acid at the 25th position
of a polypeptide of 50 amino acids, is mutated to UAA.
 
8. Differentiate between pro-insulin and mature insulin.
 
9. Name the commonly used vector for cloning genes into higher organisms. 
 
10. Which of the three forests- Temperate, Mangroves and Tropical Evergreen is more vulnerable to invasion by outside animals and plants?
 
11. Assertion: Primary transcripts in eukaryotes are nonfunctional.
 
Reason: Methyl guanosine triphosphate is attached to 5’ – end of hnRNA.
 
a. Both assertion and reason are true, and reason is the correct explanation of assertion.
 
b. Both assertion and reason are true, but reason is not the correct explanation of assertion.
 
c. Assertion is true but reason is false.
 
d. Both assertion and reason are false.
OR
Assertion: An organism with lethal mutation may not even develop beyond the zygote stage.
 
Reason: All types of gene mutations are lethal.
 
a. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
 
b. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
 
c. Assertion is true but reason is false.
 
d. Both assertion and reason are false
 
12. Assertion: E. coli having pBR322 with DNA insert at BamHI site cannot grow in medium containing tetracycline.
 
Reason: Recognition site for Bam HI is present in tetR region of pBR322.
 
a. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
 
b. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
 
c. Assertion is true but reason is false.
 
d. Both assertion and reason are false
 
13. Assertion: A community with more species is more stable than that with less species.
 
Reason: More the number of species, lesser the variation in the total biomass production year after year.
 
a. Both assertion and reason are true, and the reason is the correct explanation of the assertion.
 
b. Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
 
c. Assertion is true but reason is false.
 
d. Both assertion and reason are false
 
Please click on below link to download CBSE Class 12 Biology Boards 2021 Sample Paper Solved.

Free study material for Biology

Download CBSE Sample Papers: Class 12 Biology

How to download CBSE Class 12 Biology Boards 2021 Sample Paper Solved in PDF?

Easily download the CBSE Class 12 Biology Boards 2021 Sample Paper Solved online to strengthen your final preparations. Mastering the official paper structure is vital for Class 12 students seeking higher marks. We recommend solving these updated Biology sample papers to practice anticipated question formats. Download the PDF format for flexible offline drills, ensuring you practice under true test conditions.

Benefits of Practicing Class 12 Biology Sample Papers

  • New Question Bank: This set has fresh questions for Biology which are different from previous years.
  • Exam Pattern Knowledge: Solving more sets will help you to understand the weightage of each chapter in Class 12 and also the type of questions asked.
  • Identify Weak Areas: Comparing your score in each set helps to find out topics in Class 12 Biology for which you need hard work.
  • Speed and Accuracy: Attempting MCQ questions and long-form problems for Class 12 Biology makes you faster and better and you will be able to finish your exam on time.

Post-Practice Strategy for Class 12 Biology

  1. Verify Answers: Compare your responses against professional teacher solutions provided in the Biology Sample Paper PDF.
  2. Error Analysis: Class 12 learners must review incorrect answers carefully to understand underlying mistakes.
  3. Concept Reinforcement: Review difficult topics using the official NCERT book for Class 12 Biology before re-attempting problems.
  4. Consistent Drills: Complete multiple Biology sample sets online to solidify confidence ahead of CBSE examinations.

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You can download the complete PDF for CBSE Class 12 Biology Boards 2021 Sample Paper Solved for free from StudiesToday.com. Our resources for Class 12 Biology are updated for the latest academic session and follow the official exam pattern.

Are solutions provided for CBSE Class 12 Biology Boards 2021 Sample Paper Solved?

Yes, CBSE Class 12 Biology Boards 2021 Sample Paper Solved comes with detailed, teacher-verified solutions. We have provided step-by-step answers for Biology to help students of Class 12 understand correct methodology and marking scheme.

How can practicing CBSE Class 12 Biology Boards 2021 Sample Paper Solved help in exam preparation?

Practicing this Biology paper helps in time management and identifying important topics. For Class 12, solving mock papers is the best way to gain confidence and reduce exam-day anxiety.

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Yes, all our study materials for Class 12 Biology are provided in a mobile-friendly PDF format. You can easily download CBSE Class 12 Biology Boards 2021 Sample Paper Solved on your mobile device.