CBSE Class 12 Biology Compartment Question Paper 2026 with Solution PDF

Arts and Board Exam Specialist | Updated on - Jul 28, 2026

CBSE Class 12 Biology Compartment Question Paper 2026 will be available for download here. CBSE is conducting the Class 12 Biology Compartment Board Exam on July 28, 2026.

The Biology question paper is divided into five sections- Section A consists of Multiple Choice Questions, Section B consists of Short Answer Questions–I, Section C consists of Short Answer Questions–II, Section D consists of Case Study-Based Questions, and Section E consists of Long Answer Questions, carrying a total of 70 marks.

Download CBSE Class 12 Biology Compartment question paper 2026 with detailed solutions from the links provided below..

CBSE Class 12 Biology Compartment Question Paper 2026 with Solution PDF

CBSE Class 12 Biology Compartment Question Paper 2026	Download PDF	Check Solutions

CBSE Class 12 Biology Compartment Question Paper 2026

CBSE Class 12 Biology Unit-Wise Weightage

Unit No.	Unit Name	Marks
VI	Reproduction	16
VII	Genetics and Evolution	20
VIII	Biology and Human Welfare	12
IX	Biotechnology and Its Applications	12
X	Ecology and Environment	10
Total	—	70

CBSE Class 12 Biology Compartment Exam 2026- Last Minute Strategy

1.
Work out separate monohybrid crosses up to $F_2$ generation between two pea plants and two Antirrhinum plants, both having contrasting traits with respect to the colour of the flower. Comment on the patterns of inheritance in the crosses carried out in such two cases.
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2.
Differentiate between active and passive immunity. Write any three differences.
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3.
Draw the structure of an antibody molecule and label any four of its parts.
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4.
How does a chromosomal disorder differ from a Mendelian disorder ? Write one example for each.
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5.
Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons
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6.
Study the given chart showing evolution of plants. Answer the following questions :
7.
Name the phenomenon that leads to situations like ‘XO’ abnormality in humans. Also name this genetic disorder. How are individuals with an XO chromosomal abnormality affected ? Write its symptoms as well as karyotype.
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8.
Explain Gause’s 'Competitive Exclusion Principle' and provide a suitable ecological example that demonstrates this principle in nature.
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9.
Briefly explain the events of fertilisation and implantation in an adult human female.
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10.
Explain the different organizational levels of biodiversity at the genetic, species, and ecological levels, providing a suitable example for each category.
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11.
(I) Write the scientific names of the two species of filarial worms causing filariasis.
(II) How do they affect the body of infected persons ?
(III) How does the disease spread ?
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12.
The process of copying genetic information from template strand of DNA into RNA is called transcription. It is mediated by RNA polymerase. Transcription takes place in the nucleus of eukaryotic cells. In transcription, only a segment of DNA and only one of the strands is copied into RNA.
13.
Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.
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14.
We know that plasmids and bacteriophages are the most commonly used vectors in biotechnology experiments. If we can link an alien piece of DNA to the plasmid DNA, the alien DNA can be multiplied equal to the copy number of the plasmid. Engineered vectors are used these days. Study the diagram of the E. coli cloning vector pBR322 and answer the questions that follow :
15.
Mention the source and the functions of the above mentioned hormones.
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