CBSE Class 12 Biology Sample Paper 2019 Solved

Biology
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Find the CBSE Class 12 Biology Sample Paper 2019 Solved right below. We offer standard Class 12 Biology sample papers packed with detailed solutions for the 2026-27 term, following rules set by CBSE, NCERT, and KVS. Practice these model tests to build confidence and understand fresh marking trends.

Practice Model Papers for Class 12 Biology

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.

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CBSE Class 12 Biology Sample Paper 2019 Solved. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

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 2019 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.



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Download Sample Paper: CBSE Class 12 Biology Sample Paper 2019 Solved (Class 12 Biology)

Obtain the CBSE Class 12 Biology Sample Paper 2019 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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Post-Practice Strategy for Class 12 Biology

  1. Verify Answers: Compare your responses against professional teacher solutions provided in the Biology Sample Paper PDF.
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  4. Consistent Drills: Complete multiple Biology sample sets online to solidify confidence ahead of CBSE examinations.

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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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