Official CBSE Practice Papers for Class 12 Biology
Review targeted exam resources with the CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved. Built according to official CBSE standards for the 2026-27 academic year, these downloadable Class 12 Biology sample papers support effective revision and performance tracking.
Solved Model Papers for Biology
View or download the dedicated CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved resource below. Engaging with these sample papers under timed conditions ensures continuous academic progress and mastery of the 2026-27 exam format.
Section – A
Q. No. 1 to 12 are multiple choice questions. Only one of the choices is correct. Select and writethe correct choice as well as the answer to these questions.
1 Polydactyly (six-fingered hands) is a genetic condition due to a dominant allele (P) over recessive allele (p). If a six- fingered woman and a fivefingered man have a normal child, the genotype of the parents and the child would be:
| Mother | Father | Child | |
| (a) | PP | PP | Pp |
| (b) | Pp | PP | PP |
| (c) | Pp | Pp | PP |
| (d) | PP | Pp | Pp |
Answer : d
2 The microbes used in kitchen are
a) Lactobacillus and yeast
b) Penicillium and yeast
c) Microspora and E.coli
d) Rhizopus and Lactobacillus
Answer : d
3 Which of the following phenomena significantly contributes to speciation?
(P) Natural selection
(Q) Genetic drift
(R) Gene flow
(S) Geographic Isolation
(T) Stabilising Selection
a) Only P,Q and S
b) Only Q and S
c) Only R and T
d) Only Q,R and T
Answer : a
4 A male having abnormal arrangement of chromosome is sterile. He also shows feminine development due to unnatural presence of a Xchromosome.
Mention the chromosomal disorder from which he suffers.
a) Turner’s syndrome
b) Down’s syndrome
c) Haemophilia
d) Klienfelter’s syndrome
Answer : d
5 The hilum in a typical angiospermic ovule represents the junction between
a) Integuments and the embroyo sac
b) Embroyo sac and the nucellus
c) Body of the ovule and the funicle
d) Nucellus and the funicle
Answer : c
6 Given below is a sequence of bases in mRNA of a bacterial cell. Identify the amino acid that would be interpreted at codon position 3 and codon position 5, during the process of its translation.
3’ AUC AGG UUU GUG AUG GUA GGA 5’
a) Phenylalanine, Methionine
b) Cystein, Glycine
c) Alanine, Proline
d) Serine, Valine
Answer : a
7 The organism used in the construction of the first artificial recombinant DNA by Cohen and Boyer in 1972 was
a) E.Coli
b) Salmonella typhimurium
c) Agrobacterium tumefaciens
d) Bacillus thuringiensis
Answer : b
8 What is the smallest part of a DNA molecule that can be changed by a point mutation?
a) Oligonucleotide
b) Codon
c) Gene
d) Nucleotide
Answer : d
9 The amino acid attaches to the tRNA at its
a) 5’ end
b) 3’ end
c) Anticodon site
d) DHU loop
Answer : b
Please click the link below to download pdf file of CBSE Class 12 Biology 2025 Sample Paper Solved Set 5
Free study material for Biology
CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved & Sample Question Papers for Class 12 Biology
Class 12 Biology CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved PDF Download Guide
Access structured sample papers for Class 12 Biology. Solving the CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved provided above helps students understand official exam blueprints and tackle anticipated question formats with confidence.
Maximize Your Scores with Model Papers
- Exam Blueprint: Understand mark allocations and structural guidelines relevant to Class 12 evaluations.
- Targeted Improvement: Identify weak areas in Class 12 Biology requiring focused revision.
- Pacing & Precision: Practice mixed question formats to build execution speed and ensure timely paper completion.
Steps to Follow After Completing CBSE Class 12 Biology 2025 Sample Paper Set 05 Solved
- Self-Evaluation: Score your answers using official guidance to track your academic progress.
- Mistake Correction: Class 12 pupils must re-solve questions answered incorrectly to master the correct method.
- Continuous Practice: Take additional Biology sample modules online to maximize preparedness for CBSE evaluations.
FAQs
You can download the complete PDF for CBSE Class 12 Biology 2025 Sample Paper Set 05 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.
Yes, CBSE Class 12 Biology 2025 Sample Paper Set 05 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.
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.
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 2025 Sample Paper Set 05 Solved on your mobile device.