Biology · Class 12 Science

Goa Gbshse Class 12 Biology — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2018–2025
Years of papers: 4
Total Papers: 4
Real Board Papers: 0
Sample papers: 124
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

34 Q2025complete

34 Q2024complete

—2023Not available

—2022Not available

—2021Not available

—2020Not available

28 Q2019complete

28 Q2018complete

GBSHSE Class 12 Board Exam 2025 · Set ANNUAL

Real board examination

About this paper

The real Class-12 board examination held in 2025. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks: 70
Questions: 34
Duration: 180 min
Sections: 4

The marks / questions / duration above are the official exam pattern. We currently have 34 of this paper’s questions (100% of the full paper), with 34 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
ASection A	compulsory	13	1	13
BSection B	compulsory	12	2	24
CSection C	compulsory	6	3	18
DSection D	compulsory	3	5	15
Total		34		70

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Biology

GBSHSE Class 12 Board Exam 2025 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 34 questions divided into 4 sections — A, B, C, D.
Section A comprises 13 questions of 1 mark each (compulsory).
Section B comprises 12 questions of 2 marks each (compulsory).
Section C comprises 6 questions of 3 marks each (compulsory).
Section D comprises 3 questions of 5 marks each (compulsory).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

compulsory · 1 mark each · 13 of 13 shown

Q1.

Acrosomal reaction of the sperm occurs due to :

(a) its contact with zona pellucida of the ova
(b) reactions within the uterine environment of the female
(c) reactions within the epididymal environment of the male
(d) androgens produced in the uterus

[1]

Q2.

Choose the type of pollination in which attractants and rewards are required :

(a) Hydrophily
(b) Anemophily
(c) Cleistogamy
(d) Entomophily

[1]

Q3.

Which biotechnological application is used to produce large quantities of insulin for medicinal purpose ?

(a) DNA fingerprinting
(b) Gene therapy
(c) Polymerase Chain Reaction
(d) Recombinant DNA technology

[1]

Q4.

Why do species of bacteria and humans have their DNA analyzed using the same fundamental methods ?

(a) Every cell in every creature is identical
(b) Every organism has the same quantity of DNA
(c) All creatures have the same DNA sequence
(d) All organisms have the same basic DNA structure

[1]

Q5.

The term used to describe the species whose number of individuals is greatly reduced to a critical level.

(a) Indeterminate
(b) Rare
(c) Vulnerable
(d) Endangered

[1]

Q6.

Which of the following claims would be accurate if garden pea plants from Mendel's Garden were sampled ?

(a) Round seeds were more prevalent than wrinkled seeds
(b) Wrinkled seeds were more prevalent than round seeds
(c) Both round and wrinkled seeds were equally prevalent
(d) The response depended on the time of day the sample was taken

[1]

Page 1 of 5

Q7.

The most effective way to decrease the population of a country is : (a) to educate people (b) to have better houses and infrastructure (c) to eradicate poverty (d) to practice and implement family planning

[1]

Q8.

From among the causal organisms for ringworm select the odd one out : (a) Microsporum (b) Trichophyton (c) Epidermophyton (d) Macrosporum

[1]

Q9.

Sketch a neat diagram of a typical anatropous ovule.

[1]

Q10.

What would happen if sperms are devoid of their tail ?

[1]

Q11.

Give an example for each, an alcoholic drink produced by distillation and without distillation.

[1]

Q12.

A food web is represented in the diagram below. Which population in this food web would most likely benefit from an increase in the mice population ?

[1]

Q13.

'India represents more than 1000 varieties of mangoes biodiversity' Mention the level of biodiversity shown by mangoes.

[1]

Section B

compulsory · 2 marks each · 12 of 12 shown

Q1.

Explain how seeds offer more advantages to angiospermic plants.

[2]

Q2.

Briefly describe the role of hormones in the regulation of oogenesis. **OR** Briefly describe the role of hormones in the regulation of spermatogenesis.

[2]

Page 2 of 5

Q3.

Sketch a neat diagram of L.S. of a flower.

[2]

Q4.

Describe the Hershey and Chase experiment confirming that the genetic material is DNA.

[2]

Q5.

Draw a neat diagram showing sectional view of the female reproductive system.

[2]

Q6.

State and elaborate on any two factors affecting allelic frequencies in a population.

[2]

Q7.

Explain the sequence of events that follow when a retrovirus infects humans.

[2]

Q8.

Draw a neat diagram of Watson-Crick model for semiconservative DNA Replication.

[2]

Q9.

Illustrate with the help of a suitable example the naming of a restriction endonuclease.

[2]

Q10.

Mr. Bean went on an excursion trip with his friends to Ladakh. On reaching the destination, he suddenly experienced heart palpitations, nausea and fatigue. One of his friends suggested him to rest for some time. (i) Suggest the reasons for the sudden deterioration of health (ii) Why did Mr. Bean's friend ask him to rest ?

[2]

Q11.

Compare the features of the genetic code : Unambiguous and universal. **OR** Compare the features of the genetic code : Degenerate and initiator.

[2]

Page 3 of 5

Q12.

Give in detail any two causes of Biodiversity losses.

[2]

Section C

compulsory · 3 marks each · 6 of 6 shown

Q1.

Suggest any three methods to assist infertile couples to have children.

[3]

Q2.

Name the type of interaction seen in each of the following examples : (i) Ascaris living in the intestine of humans (ii) Wasp pollinating fig plants (iii) Clown fish living among the tentacles of sea anemone. **OR** Name the type of interaction seen in each of the following examples : (i) Mycorrhizae living in the roots of higher plants. (ii) Orchid growing on a branch of a mango tree. (iii) Disappearance of Chathamalus when Balanus dominated the rocky sea coast of Scotland.

[3]

Q3.

Write a comparative note on the characteristics of Homo habilis, Homo erectus and Homo sapiens.

[3]

Q4.

How do you think modern agricultural practices in India are being benefited from genetically modified plants ?

[3]

Q5.

Identify and state the various factors that regulate the process of decomposition.

[3]

Page 4 of 5

Q6.

Baculoviruses and Bacillus thuringiensis are the pathogens that attack plants and are also used as biocontrol agents. Justify.

[3]

Section D

compulsory · 5 marks each · 3 of 3 shown

Q1.

Give a detailed account of the Chromosomal disorders in humans. **OR** Give a detailed account of any two Mendelian disorders in humans.

[5]

Q2.

Define innate immunity and describe various types of barriers. **OR** Define acquired immunity and describe its types. Add a note on the structure of an antibody molecule.

[5]

Q3.

Explain the features : cloning sites and vectors for cloning gene in plants and animals that are required to facilitate cloning into a vector.

[5]

Page 5 of 5