CBSE Class 12 Biology Sample Paper 2022 Set 04 Solved

Biology
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Read and download the CBSE Class 12 Biology Sample Paper 2022 Set 04 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

Want to know which chapters carry high marks? Working through our Class 12 Biology model papers helps you learn chapter weightage and expected test difficulty. Solving these guess papers enables Class 12 students to find weak spots and practice better time management. We also recommend checking our previous years' Class 12 Biology Question Papers for extra practice.

Class 12 Biology Model Paper PDF Download

SECTION- A
 
1. How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 25 microspore mother cells and 25 megaspore mother cells respectively?
 
OR
 
In case of polyembryony, an embryo A develops from the synergids and the embryo B develops from the nucellus. State the ploidy of embryo A and B.
 
2. Give the scientific name of the source organism from which the first antibiotic was produced. 
 
3. The prophase I stage of meiosis plays a vital role in r-DNA formation. Justify with reason. 
 
4. Name the technique by which Gene expression can be controlled with the help of RNA molecule.
 
5. Define Diapause
 
OR
 
Define Standing Crop
 
SECTION- B
 
6. The figure given below represents a molecule present in the body of a mammal -
CBSE Class 12 Biology Sample Paper 2022 Set D Solved 1
 
a) Name the parts labelled ‘a’ and ‘b’ in the molecule shown above.
b) Name the type of cells that produce this molecule.
 
OR
 
Life style diseases are increasing alarmingly in India. We are also dealing with large scale malnutrition in the population. Suggest a process by which we can address both these problems. Give any three examples to support your answer.
 
7. Why does the lac operon shut down some time after the addition of lactose in the medium where E.coli was growing? Why low level expression of lac operon is always required?
 
8. a) While cloning vectors, which of the two will be preferred by biotechnologists - bacteriophages or plasmids. Justify with reason.
b) Name the first transgenic cow developed and state the improvement in the quality of the product produced by it.
 
9. Explain the impact of removal of thymus gland on the immune system of a human body.
 
OR
 
A farmer maintained beehives in his Brassica field during its flowering season. How will he be benefitted?
 
10. How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.
 
11. State the Mendelian principle which can be derived from a dihybrid cross and not from monohybrid cross.
 
12. Comment upon the mode of pollination in Vallisneria and Eichhornia which have emergent flowers.
 
SECTION- C
 
13. Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.
 
14. The embryo sac in female gametophyte is seven celled and eight nucleated structure. Justify the statement with the help of a labelled diagram.
 
OR
 
List the changes that occur when an ovule matures into seed.
 
15. Compare and contrast the theories of evolution proposed by Darwin and Hugo De Vries. 
 
16. Explain the different steps involved in the secondary treatment of sewage.
 
OR
 
Microbes can be used to decrease the use of chemical fertilizers. Explain how this can be accomplished.
 
17. a) How do DNA fragments migrate and resolve in a Gel electrophoresis?
b) How lane one is different from lane 2, 3 and 4 in the Gel electrophoresis set up?
c) How pure DNA fragments are made observable in the visible light?
 
CBSE Class 12 Biology Sample Paper 2022 Set D Solved 2
 
18. Suggest and explain the assisted reproductive techniques which will help a couple to have children, where the female had a blockage in the fallopian tube and the male partner had a low sperm count.
 
19. a) Construct a complete transcription unit with promoter and terminator on the basis of the hypothetical template strand given below:
CBSE Class 12 Biology Sample Paper 2022 Set D Solved 3
b) Write the RNA strand transcribed from the above transcription unit along with its polarity.
 
OR
 
a) Mention two events in which DNA is unzipped.
b) Predict the consequences when both the template and the coding strands of a DNA segment participate in transcription process?


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Obtain the CBSE Class 12 Biology Sample Paper 2022 Set 04 Solved directly from our site to boost your exam readiness. Learning the precise blueprint behind question creation is essential for Class 12 learners aiming for high grades. Working through these latest Biology model sets exposes you to likely exam questions. Utilize the PDF format download for offline study, simulating real exam constraints at home.

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  • Original Question Sets: Provides diverse practice questions for Biology to expand your problem-solving range.
  • Exam Structure Mastery: Understand exact mark allocations and question architectures relevant to Class 12 evaluations.
  • Gap Analysis: Check your accuracy levels to identify challenging Class 12 Biology concepts requiring deeper review.
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How to Analyze Your Performance in CBSE Class 12 Biology Sample Paper 2022 Set 04 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 should refer to the 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 our website to build confidence before the CBSE exams.

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