CBSE Class 12 Biology Boards 2021 Sample Paper Solved

Biology
Download PDF

Class 12 Biology Solved Model Papers: CBSE Class 12 Biology Boards 2021 Sample Paper Solved

Access comprehensive sample question papers for Class 12 Biology using the CBSE Class 12 Biology Boards 2021 Sample Paper Solved. Designed to align with the 2026-27 CBSE academic guidelines, these model papers help students assess their exam readiness and understand current marking schemes.

Download Class 12 Biology Sample Paper PDF

View or download the dedicated CBSE Class 12 Biology Boards 2021 Sample Paper Solved resource below. Engaging with these sample papers under timed conditions ensures continuous academic progress and mastery of the 2026-27 exam format.

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

Class 12 Biology CBSE Class 12 Biology Boards 2021 Sample Paper Solved PDF Download Guide

Explore downloadable sample sets for Class 12 Biology. Utilizing the CBSE Class 12 Biology Boards 2021 Sample Paper Solved allows learners to gauge exam readiness and master official CBSE assessment structures.

Key Advantages of Solving CBSE Class 12 Biology Boards 2021 Sample Paper Solved

  • Exam Blueprint: Understand mark allocations and structural guidelines relevant to Class 12 evaluations.
  • Targeted Improvement: Identify weak areas in Class 12 Biology requiring focused revision.
  • Pacing & Precision: Practice mixed question formats to build execution speed and ensure timely paper completion.

Post-Practice Strategy for Class 12 Biology

  1. Verify Answers: Compare your responses against professional teacher solutions provided in the sample paper keys.
  2. Error Analysis: Class 12 learners must review incorrect answers carefully to understand underlying mistakes.
  3. Concept Reinforcement: Consult the official NCERT book for Class 12 Biology when stuck before re-attempting problems.

FAQs

Where can I download the PDF for CBSE Class 12 Biology Boards 2021 Sample Paper Solved?

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.

Is the CBSE Class 12 Biology Boards 2021 Sample Paper Solved accessible on mobile and tablets?

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.