CBSE Class 12 Biology Sample Paper 2021 Set 01 Solved

Biology
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Read and download the CBSE Class 12 Biology Sample Paper 2021 Set 01 Solved, designed by expert teachers according to the latest 2025-26 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 How is it possible in Oxalis and Viola to produce assured seed set even in the absence of pollinators?
 
2 What do you infer from the resemblance between flying phalangers and flying squirrels with reference to their evolution?
 
3 Name the plant source of a drug which is popularly called as smack. How does it affect the body of the abuser?
 
4 What is called as the natural genetic engineer of plants? Why? 
 
5 The gene cry1Ab is introduced into a plant to control corn borer.
a) Name the resultant plant after successful insertion of the gene.
b) State its importance in the plant.
 
SECTION B
 
6 Differentiate between the 2 cells enclosed in a mature male gametophyte of an angiosperm. 
 
7 a) Name the protozoan parasite that causes dysentery in human.
b) Mention 2 diagnostic symptoms of the disease.
c) How is this disease transmitted to others?
 
8 How can DNA segments be separated by gel electrophoresis, visualized and isolated? 
 
9 a) Give one example to show how alien species introduction can result in loss of biodiversity.
b) How is the 6th extinction presently in progress different from the previous episodes?
 
10 Which growth model is considered as a more realistic one? Justify. 
 
SECTION C
 
11 a) Write the characteristic features of anther,pollen and stigma of wind pollinated flowers.
b) How do flowers reward their insect pollinators?
 
12 Write the function of each of the following.
a) seminal vesicle   b) scutellum   c) acrosome of human sperm
 
13 A DNA segment has a total of 1500 nucleotides out of which 410 are Guanine containing nucleotides. How many pyramidine bases this DNA segment will have?
 
14 a) Name the scientist who called t RNA as adapter molecule.
b) Draw a clover leaf structure of t-RNA showing the following.
1 )Tyrosine attached to t-RNA.
2 )Anticodon UCA for this in its correct site.
 
OR
 
a) Only one strand of DNA takes part in transcription.Why?
b) Give a brief note on the various complexities involved in eukaryotic transcription.
 
15 A pea plant with purple flowers was crossed with white flowers producing 50 plants with only purple flowers. On selfing these produced 482 plants with purple flowers and 162 with white flowers. Show the cross and explain which genetic mechanism accounts for this result?
 
16 A non haemophilic couple was informed by their doctor that there is possibility of a haemophilic child to be born to them. Explain the basis of this information. Give the genotypes and phenotypes of all the possible children who could be born to them.
 
17 a) Name the Indian scientist whose efforts brought Green Revolution in India.
b) Mention the steps that are essentially carried out in developing a new genetic variety of crop under plant breeding programme.
 
18 a)Name the infective stage of Plasmodium which Anopheles takes in along with the blood meal from the infected human.
b) Why does the infection cause fever in humans?
c) Give a flow chart of that part of the life cycle of the parasite in the insect.
 
19.Write the significance of the following in biotechnology.
a) chilled ethanol b)Microinjection c)Bioreactors
 
20 How did the American Company go about preparing the human insulin? How is that different from that produced by the functional human insulin gene?
 
21 a) Name the type of biodiversity represented by 50,000 different strains of rice in India.
b) What is so special about tropics that accounts for their greater biological diversity?
 
22 a) Mention the major causes of air pollution in metro cities.
b) Explain any 3 measures taken by the Delhi Government to control pollution.
 
SECTION D
 
23 A snake charmer came to a house and smelled the presence of a cobra. He convinced the residents that he could remove the cobra. The residents allowed him to look for the snake and kill it .One of the resident objected to the action.
a) Do you think that the resident was right in objecting?
b) What is the importance of a snake in the ecosystem?
c) What value is being exhibited by the resident?
 
SECTION E
 
24 Describe in sequence the events that lead to the development of a 3 celled pollen from pollen mother cell in angiosperms.
 
OR
 
a) Give a schematic representation showing the events of oogenesis in human female.
b) Mention the various events which occur just prior to fertilization in human.
 
25 a) Explain Mendels law of independent assortment with an example.
b) How did Morgan show the deviation in inheritance pattern in Drosophila with respect to this law?
 
OR
 
a) What is Industrial melanism?
b) Explain the case of Industrial melanism as an evidence of Natural selection.
 
26 a) Give a schematic representation of replication of HIV in human.
b) Why is it called a retro virus?
c) Mention any 2 measures taken by the NGOs to educate people about AIDS.
 
OR
 
a) What are the various stages in the treatment of sewage?
b) Give a note on the role of microbes in sewage treatment.


Please click on below link to downloadCBSE Class 12 Biology Sample Paper 2021 Set A Solved

2025
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2024
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2023
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2022
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2021
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2020
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2019
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2018
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2017
CBSE Class 12 Biology Sample Paper 2017 Set 08
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2015
CBSE Class 12 Biology Sample Papers 2015 Set 08
CBSE Class 12 Biology Sample Papers 2015 Set 07
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CBSE Class 12 Biology Sample Papers 2015 Set 05
CBSE Class 12 Biology Sample Papers 2015 Set 04
CBSE Class 12 Biology Sample Papers 2015 Set 03 Solved
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CBSE Class 12 Biology Sample Papers 2015 Set 01
2014
CBSE Class 12 Biology Sample Paper 2014 Set 08
CBSE Class 12 Biology Sample Paper 2014 Set 07
CBSE Class 12 Biology Sample Paper 2014 Set 06
CBSE Class 12 Biology Sample Paper 2014 Set 05
CBSE Class 12 Biology Sample Paper 2014 Set 04 Solved
CBSE Class 12 Biology Sample Paper 2014 Set 03
CBSE Class 12 Biology Sample Paper 2014 Set 02
CBSE Class 12 Biology Sample Paper 2014 Set 01
2013
CBSE Class 12 Biology Sample Paper 2013 Set 09
CBSE Class 12 Biology Sample Paper 2013 Set 08 Solved
CBSE Class 12 Biology Sample Paper 2013 Set 07
CBSE Class 12 Biology Sample Paper 2013 Set 06
CBSE Class 12 Biology Sample Paper 2013 Set 05
CBSE Class 12 Biology Sample Paper 2013 Set 04
CBSE Class 12 Biology Sample Paper 2013 Set 03 Solved
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CBSE Class 12 Biology Sample Paper 2013 Set 01 Solved
2012
CBSE Class 12 Biology Sample Paper 2012 Set 05 Solved
CBSE Class 12 Biology Sample Paper 2012 Set 04
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CBSE Class 12 Biology Sample Paper 2012 Set 01
2011
CBSE Class 12 Biology Sample Papers 2011 Set 04
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2010
CBSE Class 12 Biology Sample Paper 2010 Set 04 Solved
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CBSE Class 12 Biology Sample Paper 2010 Set 01
2009
CBSE Class 12 Biology Sample Paper 2009 Set 06
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How to download CBSE Class 12 Biology Sample Paper 2021 Set 01 Solved in PDF?

Students can easily download the CBSE Class 12 Biology Sample Paper 2021 Set 01 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 01 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 01 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.
Where can I download the PDF for CBSE Class 12 Biology Sample Paper 2021 Set 01 Solved?

You can download the complete PDF for CBSE Class 12 Biology Sample Paper 2021 Set 01 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 01 Solved?

Yes, CBSE Class 12 Biology Sample Paper 2021 Set 01 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 01 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 01 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 01 Solved on your mobile device.