CBSE Class 12 Biology Boards 2020 Sample Paper Solved

Biology
Download PDF

Official CBSE Practice Papers for Class 12 Biology

Explore authentic exam practice materials through the CBSE Class 12 Biology Boards 2020 Sample Paper Solved. Tailored for Class 12 learners, utilizing these Biology sample papers ensures thorough preparation and strengthens time management skills before final CBSE evaluations.

Solved Model Papers for Biology

Access the complete sample paper PDF for Class 12 Biology below. Regular practice with these targeted mock exams builds familiarity with expected question patterns and chapter weightage to help secure higher marks.

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.



Please refer to link below to download CBSE Class 12 Biology Boards 2020 Sample Paper Solved

Free study material for Biology

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

Download Sample Paper: CBSE Class 12 Biology Boards 2020 Sample Paper Solved (Class 12 Biology)

Review model practice papers for Class 12 Biology. Working through the CBSE Class 12 Biology Boards 2020 Sample Paper Solved under simulated test conditions at home ensures complete familiarity with upcoming school evaluations.

Maximize Your Scores with Model Papers

  • 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.

How to Analyze Your Performance in CBSE Class 12 Biology Boards 2020 Sample Paper Solved

  1. Review Solutions: Evaluate your completed papers using expert-verified guidance inside our solution sets.
  2. Target Weaknesses: Class 12 students should analyze missed questions to rectify conceptual misunderstandings.
  3. Deep Revision: Re-read sections in the NCERT book for Class 12 Biology to clear doubts before solving items again.

FAQs

Where can I download the PDF for CBSE Class 12 Biology Boards 2020 Sample Paper Solved?

You can download the complete PDF for CBSE Class 12 Biology Boards 2020 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 2020 Sample Paper Solved?

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.

Is the CBSE Class 12 Biology Boards 2020 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 2020 Sample Paper Solved on your mobile device.