CBSE Class 12 Biology Sample Paper 2021 Set 03 Solved

Biology
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Read and download the CBSE Class 12 Biology Sample Paper 2021 Set 03 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.

Solved Sample Paper for Class 12 Biology PDF

Our Class 12 Biology model papers are important for understanding the weightage of different chapters and the difficulty level of expected questions. By solving these guess papers Class 12 students can identify weak areas and improve time management. We also suggest referring to our Class 12 Biology Question Papers of previous years to further strengthen your exam preparation.

Class 12 Biology Sample Paper with Solutions

SECTION A
 
1 What stimulates the pituitary to release the hormone for parturition? Name the hormone. 
 
2 Are flippers of penguins and dolphins homologous or analogous organs? What type of evolution does it show?
 
3 How is the presence of cyanobacteria in the paddy fields beneficial to crops? 
 
4 Name the special type of polymerase used in PCR and state its importance. 
 
5 Bt toxin does not kill the bacteria that produce it but kills the insect that ingests it. Why? 
 
SECTION B
 
6 List the post fertilization events in angiosperms. 
 
7 Why does a doctor give tetanus antitoxin and not a vaccine to a child injured in an accident with a bleeding wound?
 
OR
 
Draw the structure of an antibody molecule. What type of immunity is brought about by antibodies?
 
8 What is GMO? Give examples of any 2 GMOs and their application. 
 
9 What are ecological pyramids? What are the short comings of ecological pyramids in the study of ecosystem?
 
10 What is stability in a community? How did David Tilman show this experimentally?
 
SECTION C
 
11 a)Where does spermatogenesis occur in testes? Describe the process with a figure.
b)Trace the path of spermatozoan from testes upto the ejaculatory duct.
 
12 What is ART? How is it useful to human? How are ZIFT and GIFT different from IUT? 
 
13 A normal woman whose father is colour blind marries a normal visioned man. What would be the probability of her sons and daughters to be colour blind? Explain with a cross.
 
14 What is the principle of DNA finger printing? List out the steps involved in the process. 
 
OR
 
What is HGP? What are its goals?
 
15 a) State the arrangement of different genes that in bacteria is referred to as operon.
b) Give a schematic representation of lac operon in a switched- on state.
c) What is the role of lactose in the above operon?
 
16 a) Give the set up used by Urey and Miller for their experiment.
b) Write the names of the different gases and the conditions set up for the expt.
c) What was the conclusion drawn from the expt. Performed?
 
17 a) What is meant by addictive disorder?
b) Name any 2 opiate narcotics.
c) Mention any 2 ways by which they affect the body.
 
18 Mention A and B of the following flow chart. Why is the importance of the technique shown is increasing?
   Habit and nature of bees
      ↓
   Selection of location
      ↓
  Catching and swarming of bees
      ↓
      A
      ↓
      B
   
19 Why are genes with antibiotic resistance considered as useful selectable markers for E.coli cloning vector? Explain with an example.
 
20 a) Name the nematode that infects the tobacco plants.
b) How are transgenic plants of tobacco raised to solve the above problem?
 
21 Study the population growth curves given below.
CBSE Class 12 Biology Sample Paper 2021 Set C Solved 1
a) Identify curves a and b.
b) Mention the conditions responsible for curves a and b.
c )What is K in curve b? Define.
 
22 What initiatives were taken for reducing vehicular air pollution in Delhi? Has the quality of air improved in Delhi?
 
SECTION D
 
23 A lake that is rich in marine fishes sees a decline in its species population due to over harvesting. The people in the area made it a sacred grove and started worshipping it. The species population of the lake also became normal.
a) Which values are being promoted in the above case?
b) What would have been the effect if the lake had not been declared as a sacred grove?
 
SECTION E
 
24 a) Draw a sketch of the section of a typical anatropous ovule.
b) List the components of the embryo sac and mention their fate on fertilization.
 
OR
 
a) Give a schematic representation of spermatogenesis in humans.
b) At which stage of life does gametogenesis begin in male and female respectively?
c) Name the organs where the above process gets completed.
 
25 A tall pea plant with yellow seeds heterozygous for both the traits is crossed with adwarf plant with green seeds. Work out the cross and show the F2 generation in the form of a checker board. Give the phenotypic ratio.
 
OR
 
a)Why is DNA molecule a more stable genetic material than RNA?
b) Mention the salient features of a genetic code.
 
26 a) Cancer is one of the most dreaded human disease. Explain contact inhibiton and metastasis with reference to the disease.
b) Name the group of genes that could lead to cancer and how they do so?
c) Name any 2 techniques which are useful to detect cancers of internal organs.
d) What is the role of biological response modifiers with respect to the above?
 
OR
 
Complete the given table and add a note on their utility in human.

CBSE Class 12 Biology Sample Paper 2021 Set C Solved 2


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How to download CBSE Class 12 Biology Sample Paper 2021 Set 03 Solved in PDF?

Students can easily download the CBSE Class 12 Biology Sample Paper 2021 Set 03 Solved from our website to prepare for their upcoming examinations. To score high marks, it is important for Class 12 students to understand the exaact pattern as per which teachers design the question papers. We strongly suggest that you practice these latest sample papers for Biology and solve different types of questions that are expected to come this year. You can downloadin PDF format so that you can practice offline. We also recommend that Class 12 students solve these papers actual exam conditions at home.

Why should you solve CBSE Class 12 Biology Sample Paper 2021 Set 03 Solved?

Practicing these model papers has several benefits for Class 12 students:

  • 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 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 Sample Paper 2021 Set 03 Solved?

  1. Check Your Work: Match your answers with the solutions given by our teachers in the Biology Sample Paper PDF.
  2. Learn from Mistakes: Class 12 students should focus on the questions which you solved incorrectly and understand the error.
  3. Revision: If you find a question difficult you shoul refer to NCERT book for Class 12 Biology to understand concepts and then try the question again.
  4. Continuous Practice: Solve multiple sets of Biology sample papers from studiestoday.com to build confidence before the CBSE exams.

FAQs

Where can I download the PDF for CBSE Class 12 Biology Sample Paper 2021 Set 03 Solved?

You can download the complete PDF for CBSE Class 12 Biology Sample Paper 2021 Set 03 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 Sample Paper 2021 Set 03 Solved?

Yes, CBSE Class 12 Biology Sample Paper 2021 Set 03 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 Sample Paper 2021 Set 03 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 Sample Paper 2021 Set 03 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 Sample Paper 2021 Set 03 Solved on your mobile device.