CBSE Class 12 Biology Boards 2020 Sample Paper Solved

Biology
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Here is the CBSE Class 12 Biology Boards 2020 Sample Paper Solved for your practice. Download professional Class 12 Biology sample papers featuring clear solutions, aligned with the 2026-27 syllabus standards of CBSE, NCERT, and KVS. Solving these mock sets lets students test their skills against current exam criteria.

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Try these Class 12 Biology model papers to master exam difficulty levels and plan your time wisely. Solving these papers helps Class 12 learners track their progress easily. Don't forget to practice our previous years' Class 12 Biology Question Papers for complete exam readiness.

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CBSE Class 12 Biology Boards 2020 Sample Paper Solved. CBSE has recently released the class 12 sample papers for subject Biology. These suggested sample papers are released every year by CBSE ahead of the class 12 board exams so that the students can understand the pattern of question paper and type of questions which is expected to come in the Class 12 board exams. Students can refer to the attached question paper along with marking scheme to understand what they can expect in the board exams in 2020. Its always better to solve the question paper first and then refer to provided answers.

SECTION – A
1. Androgens are synthesized by:
a.) Sertoli Cells
b.) Leydig cells
c.) Seminal vesicles
d.) Bulbourethral gland
 
OR
A procedure that finds use in testing for genetic disorders, but is also misused for female foeticide is:
a.) Lactational amenorrhea
b.) Amniocentesis
c.) Artificial insemination
d.) Parturition
 
2. Which type of immune response is responsible for the rejection of tissues/organs in the patient’s body post transplantation?
a.) auto-immune response
b.) humoral immune response
c.) physiological immune response
d.) cell-mediated immune response
 
OR
Rheumatoid arthritis is caused when . . .
i.) Lymphocytes become more active
ii.) Body attacks self cells
iii.) More antibodies are produced in the body
iv.) The ability to differentiate pathogens or foreign molecules from self-cells is lost
 
Choose the correct answer from the options given below:
a.) i and ii
b.) iii and iv
c.) i and iii
d.) ii and iv

3. Name the enzymes 'P' and 'Q' that are involved in the processes given below.

CBSE-Class-12-Biology-Boards-2020-Sample-Paper-Solved 1

a.) Enzyme P-Exonuclease and Enzyme Q-Permease
b.) Enzyme P-Exonuclease and Enzyme Q- Ligase
c.) Enzyme P-Endonuclease and Enzyme Q- Permease
d.) Enzyme P-Restriction endonuclease and Enzyme Q-Ligase
 
4. A biotechnologist wanted to create a colony of E.coli possessing the plasmid pBR322, sensitive to Tetracycline. Which one of the following restriction sites would he use to ligate a foreign DNA?
a.) Sal I
b.) Pvu I
c.) EcoRI
d.) Hind III
 
5. The most important cause of biodiversity loss is:
a.) Over exploitation of economic species
b.) Habitat loss and fragmentation
c.) Invasive species
d.) Breakdown of plant-pollinator relationships
 
SECTION B
 
6. How does an encysted Amoeba reproduce on return of favourable conditions?
 
OR
What are gemmules and conidia? Name one organism each in which these are formed?
 
7. Name any two copper releasing IUD’s. State how they act as a contraceptive. 
 
8. Why is it not possible to study the pattern of inheritance of traits in human beings,the same way as it is done in pea plant? Name the alternate method employed for such an analysis of human traits.



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CBSE Class 12 Biology Boards 2020 Sample Paper Solved & Sample Question Papers for Class 12 Biology

Access Sample Papers for Class 12 Biology

Access and download the CBSE Class 12 Biology Boards 2020 Sample Paper Solved effortlessly from our platform to gear up for your upcoming school assessments. To achieve top scores, Class 12 students must understand the structural design used by educators. We advise practicing these current Biology sample papers to tackle expected question types. Save files in a convenient PDF format for offline revision, and attempt them under strict home exam conditions for best results.

Why Practice Class 12 Biology Model 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.

What should you do after solving CBSE Class 12 Biology Boards 2020 Sample Paper Solved?

  1. Review Solutions: Evaluate your completed papers using teacher-prepared keys inside the Biology Sample Paper PDF.
  2. Target Weaknesses: Class 12 students should analyze missed questions to rectify conceptual misunderstandings.
  3. Textbook Reference: Consult the NCERT book for Class 12 Biology when stuck, then practice the concept fresh.
  4. Ongoing Practice: Take additional Biology sample sets on our platform to ensure full readiness for CBSE tests.

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Yes, CBSE Class 12 Biology Boards 2020 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 2020 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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