Goa Board Class 12 Sample Paper 2025 Biology

2025

GOA BOARD
MODEL
PAPERS
Syllabus
Scheme of Question Paper

Prepare yourself for upcoming Goa
Board Exams

To,
The Secretary,
Goa Board of Secondary and Higher Secondary Education,
Alto Betim, Goa
20/ 04/2024

Subject: New assessment scheme 2024-25 in biology for standard XII ( Subject Code
H- 4704 )

Respected Sir,
I hereby submit following documents pertaining to assessment scheme 2024-25 in Biology for
standard XII.
The documents submitted are as follows :
1. Syllabus of Biology ( Theory & practical )
2. Portion for Final Exam
3. Design of question paper for Final Exam.
4. Portion for First Mid-Term Exam
5. Portion for First Term Exam
6. Design of question paper for First Mid- Term / First Term Exam
7. Model paper with Blue Print for final exam.
Thanking You,

Yours faithfully

Mrs.Meeta Bandekar
(convenor)

CLASS---- XII ( SYLLABUS)

SUBJECT----- BIOLOGY
SUBJECT CODE----- 4704
THEORY

UNIT VI
REPRODUCTION

Chapter-2: Sexual Reproduction in Flowering Plants
Flower- A Fascinating Organ of Angiosperms ,Pre-Fertilization : structure and Events ,Double
Fertilization , Post- Fertilization events : structure and Events ,
Apomixis and Polyembryony;

Chapter-3: Human Reproduction
The male reptiductive system, The female reproductive system, Gametogenesis, Menstrual cycle,
Fertilisation and Implantation, Pregnancy and Embryonic development, Parturition and Lactation.

Chapter-4: Reproductive Health
Reoroductive Health- Problems and Strategies, Population explosion and Birth control, Medical
termination Of Pregnancy( MTP), Sexually Transmitted Diseases( STDs), Infertility.
Unit-VII
GENETICS AND EVOLUTION

Chapter-5: Principles of Inheritance and Variation
Mendel’s Laws of Inheritance, Inheritance of One Gene, Inheritance of Two Genes, Polygenic
Inheritance, Pleiotrophy
Sex Determination , Mutation , Genetic Disorders.

Chapter-6: Molecular Basis of Inheritance
The DNA, The Search for Genetic Material, RNA World, Replication, Transcription, Genetic
Code, Translation, Regulation of Gene Expression, Human Genome Project, DNA Fingerprinting

Chapter-7: Evolution
Origin of life, Evolution of Life Forms- A Theory, What are the Evidences for Evolution ? What
is Adaptive Radiation?, Biological Evolution, Mechanism of Evolution, Hardy- Weinberg
Principle, A Brief Account of Evolution, Origin and Evolution of Man

Unit-VIII
BIOLOGY IN HUMAN WELFARE
Chapter-8: Human Health and Diseases
Common Diseases in Humans, Immunity, AIDS, Cancer, Drugs and Alcohol Abuse,

Chapter-10: Microbes in Human Welfare

Microbes in Household Products, Microbes in Industrial Products, Microbes in Sewage
Treatment, Microbes in Production of Biogas, Microbes as Biocontrol Agents, Microbes as
biofertilisers
Unit-IX
BIOTECHNOLOGY
Chapter-11: Biotechnology - Principles and Processes
Principles of biotechnology, Tools of Recombinant DNA Technology, Processes of Recombinant
DNA Technology.

Chapter-12: Biotechnology and its Applications
Biotechnological Applications in Agriculture, Biotechnological Applications in Medicine,
Transgenic Animals, Ethical Issues
Unit-X
ECOLOGY
Chapter-13: Organisms and Populations
Organism and its Environment, Populations

Chapter-14: Ecosystem
Ecosystem – Structure and Function, Productivity, Decomposition, Energy Flow, Ecological
Pyramids, Ecological Succession, Nutrient Cycling, Ecosystem services.

Chapter-15: Biodiversity and its Conservation
Biodiversity, Biodiversity conservation

Note:
1. Refer to the latest edition of NCERT Biology text book.
2. There is no deletion of any subtopic under the main topics mentioned in each chapter.
Mrs. Meeta Bandekar

(Convenor)

Syllabus of Biology Practical – ClassXII
List of Experiments :
Section A – Physiology Experiment
1. To determine the pH and water holding capacity of garden or paddy field soil.

2. To detect presence of phosphate, nitrate and sulphate salts in paddy field soil.

3. To study B.O.D. of the given sample of pond water.

4. To study the effect of different temperature on the action of salivary amylase on starch.

5. To study the effect of different pH on the action of salivary amylase on starch.

Section B – Preparation of temporary stained slide

1. Onion root tip for mitosis

2. Onion/Rheo anther for meiosis.

Section C – Identification/Spotting

1. Adaptations in insect pollinated flower (Ocimum/Leucas/Salvia)
2. Adaptations in wind pollinated flower (Maize/Grass)
3. Study of T.S. of Testis (Any vertebrate)
4. Study of T.S. of Ovary (Any vertebrate)
5. Study of V.S. of Blastula (Any vertebrate)
6. Prepared pedigree chart of inability to roll the tongue.
7. Prepared pedigree chart of Widow’s peak.
8. Identification of organisms and symptoms of disease caused.
● Ascaris
● Entamoeba
● Plasmodium
9. Adaptation of plant to dry condition (Suitable specimen to be given)
10. Adaptation of plant to aquatic condition (Suitable specimen to be given)
11. Adaptation of animal to dry condition (Suitable specimen/chart/model to be given)
12. Adaptation of animal to aquatic condition (Suitable specimen to be given)
13. Identification of Homologous organs in plants. (eg. Thorn of bougainvillea and tendrils of
Cucurbita)
14. Identification of Homologous organs in animals.( eg. Fore limbs of frog and Flipper of
turtle/ Wings of bird).

15. Identification of Analogous organs in plants. ( eg . tuber of potato and sweet potato).
16. Identification of Analogous organs in animals. (eg. Wings of bird and butterfly).
Mrs. Meeta Bandekar
( Convenor )

GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION
ALTO – BETIM 403521
TERMWISE PORTION IN BIOLOGY
ASSESSMENT SCHEME FOR THE ACADEMIC YEAR 2024-25.
STD: XII

PORTION FOR FINAL EXAM

Sr No. Units Marks
1. REPRODUCTION 16
Chapter 2: Sexual Reproduction in Flowering plants 6
Chapter 3: Human Reproduction 6
Chapter 4: Reproductive Health 4

2. GENETICS AND EVOLUTION 18
Chapter 5: Principles of Inheritance and Variations 6
Chapter 6: Molecular Basis of Inheritance 7
Chapter 7 : Evolution 5

3. BIOLOGY IN HUMAN WELFARE 12
Chapter 8: Human Health and Diseases 8
Chapter 10: Microbes in Human Welfare 4

4. BIOTECHNOLOGY 11
Chapter 11: Biotechnology: Principles and Processes 7
Chapter 12: Biotechnology and its Applications 4

5. ECOLOGY 13
Chapter 13: Organisms and populations 5
Chapter 14 : Ecosystem 4
Chapter 15: Biodiversity and Conservation 4

TOTAL 70

GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION
ALTO – BETIM 403521

DESIGN OF THE QUESTION PAPER FOR FINAL EXAM (2024-25)
CLASS: XII

TIME: 3 Hours SUBJECT: BIOLOGY Max. Marks: 70

The weightage of the distribution of marks over different dimensions of the question paper shall
be as follows:

1. Weightage to learning outcomes:

Sr Learning Outcomes Marks Percentage of
No. Marks
1. Knowledge 28 40 %
2. Understanding 21 30 %
3. Application 14 20 %
4. Skill 07 10%

TOTAL 70 100%

2, Weightage to Content / Subject units

Sr No. Unit Marks
1. Reproduction 16
2. Genetics and Evolution 18
3. Biology in Human Welfare 12
4. Biotechnology and its applications 11
5. Ecology 13
TOTAL 70

3. Weightage to forms of questions:

Sr Form of Questions Marks for No. of Total
No. each Questions Marks
Questions
1. Long Answer types 05 03 15
(LA)
2. Short Answer Type (SA 03 06 18
– I)
3. Short Answer Type (SA 02 12 24
– II)
4. Very Short Answer 01 13 13
Type (VSA/ MCQ) (08MCQ+5VSA)
TOTAL 34 70

4. Expected Time for different types of question would be as follows

Sr No. Forms of Questions Approx. Time No. of Approx. Time
for each Questions for each form of
Question in mins (n) Questions in
(t) mins (n x t)
1. Long Answer types 14 min 03 03 x 14 min =42
(LA)
2. Short Answer Type 07min 06 06 x 07 min = 42
(SA – I)
3. Short Answer Type 05 min 12 12 x 5 min = 60
(SA – II)
4. Very Short Answer 02 min 13 13 x 2min = 26
Type (VSA)
TOTAL 34 170min

As the total time calculated on the basis of number of questions required to be answered and the
length of their anticipated answers, it would therefore, be advisable for the candidates to budget their

time properly by cutting out the superfluous words and be within the expected time limits.

5. Weightage to difficulty level of Questions

Sr Estimated Difficulty Level of Marks Percentage
No Questions
.
1. Easy 18 30 %
2. Average 42 50 %
3. Difficulty 10 20 %
Total 70 100 %
The question may vary in difficulty level from individual to individual. As such, the
assessment in respect of each question will be made by paper setter, on the basis of general
anticipation from the group as a whole , taking the examination. This provision is only to
make the paper balanced in weightage , rather than to determine the pattern of marking at
any stage.

● The theory paper will be of 70 marks and 3 hours duration.
● The questions shall be from all the units.
● The question paper shall have four(4) Sections A,B,C and D

⮚ Section A has 13 questions of 01 mark each.

⮚ Section B has 12 questions of 02 marks each.

⮚ Section C has 06 questions of 03 marks each.

⮚ Section D has 03 questions of 05 marks each.

● The total number of questions will be 34.
● All questions will be compulsory.
● There is no overall choice, however an internal choice is provided in two questions of
Section B , one question of Section C and two questions of Section D.
Meeta Bandekar
( Convenor)

GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION
ALTO – BETIM 403521
PORTION IN BIOLOGY ASSESSMENT SCHEME
FOR THE ACADEMIC YEAR 2024-25
STD: XII

PORTION FOR FIRST MID TERM EXAMINATION

Sr No. Units Marks
1. Reproduction
Chapter 2 :Sexual Reproduction in Flowering 5
Plants
Chapter 3 : Human Reproduction 5
Chapter 4 :Reproductive Health 4

2. Genetics and Evolution
Chapter 5 : Principles of Inheritance and variation 6

TOTAL 20

PORTION FOR FIRST TERM EXAMINATION

Sr No. Units Marks
1. Reproduction
Chapter 2 :Sexual Reproduction in Flowering 08
Plants
Chapter 3 : Human Reproduction 08
Chapter 4 :Reproductive Health 06

2. Genetics and Evolution
Chapter 5 : Principles of Inheritance and variation 09
Chapter 6 : Molecular Basis of Inheritance 09
Chapter 7 : Evolution 07

3. Biology In Human Welfare
Chapter 10 : Microbes in Human Welfare 06

4. Ecology
Chapter 14 : Ecosystem 07
TOTAL 60

GOA BOARD OF SECONDARY AND HIGHER SECONDARY
EDUCATION
ALTO – BETIM 403521
DESIGN OF THE QUESTION PAPER
FIRST MID TERM EXAMINATION (2024-25)
STD: XII

TIME: 1 hr SUBJECT: BIOLOGY MAX. MARKS: 20

The weightage of the distribution of marks over different dimensions of the question paper shall
be as follows:

1. Weightage to learning outcomes

Sr Learning Outcomes Marks Percentage of
No. Marks
1. Knowledge 07 35 %
2. Understanding 06 30 %
3. Application 05 25 %
4. Skill 02 10 %
TOTAL 20 100 %

2. Weightage to content/ subject units ( First Mid Term Examination)

Sr No. Units Marks
1. Reproduction
Sexual Reproduction in Flowering Plants 5
Human Reproduction 5
Reproductive Health 4

2. Genetics and Evolution
Principles of Inheritance and variation 6
TOTAL 20

3. Weightage to forms of questions:

Sr Form of Questions Marks for each No. of Total
No. Questions Questions Marks
1. Long Answer types (LA) --- --- ---
2. Short Answer Type (SA – I) 03 02 06
3. Short Answer Type (SA – II) 02 05 10
4. Very Short Answer Type (VSA) 01 04 04
TOTAL 11 20

4. Expected Time for different types of question would be as follows :

Sr Forms of Questions Approx. No. of Approx. Time
No. Time for Questions for each form
each (n) of Questions
Question in in mins (n x t)
mins (t)
1. Long Answer types (LA) --- --- ---
2. Short Answer Type (SA – I) 10 min 02 2 x 10 min =
20
3. Short Answer Type (SA – II) 05 min 05 5 x 5 min = 25
4. Very Short Answer Type 02 min 04 4 x 2min = 8
(VSA)
TOTAL 53 min

As the total time is calculated on the basis of the number of questions required to be answered
and the length of their anticipated answers. It would, therefore be advisable for the candidates to
budget their time properly by cutting out the superfluous words and be within the expected time
limits.

Scheme of options
(There will be no overall choice. However, there is an internal choice in 01 sub questions of 02
marks category and 01 sub-questions of 03 marks category)

5. Weightage to difficulty level of Questions :

Sr No. Estimated Difficulty Level of Questions Percentage
1. Easy 30 %
2. Average 50 %
3. Difficulty 20 %
TOTAL 100 %

● Question paper will have three sections A, B, C.
● Section A will have 04 questions of 01 mark.
● Section B will have 05 questions of 02 marks.
● Section C will have 02 questions of 03 marks.
● Question shall be from all the chapters specified above.
● Total number of questions will be 11.
Meeta Bandekar
( Convenor)

GOA BOARD OF SECONDARY AND HIGHER SECONDARY
EDUCATION
ALTO – BETIM 403521
DESIGN OF THE QUESTION PAPER
FIRST TERM EXAMINATION (2024-25)
STD: XII

TIME: 2hrs 30 mins SUBJECT: BIOLOGY MAX. MARKS: 60

The weightage of the distribution of marks over different dimensions of the question paper shall
be as follows:

1. Weightage to learning outcomes

Sr Learning Outcomes Marks Percentage
No. of
Marks
1. Knowledge 18 30%
2. Understanding 21 35%
3. Application 15 25 %
4. Skill 06 10 %
Total 60 100 %

2. Weightage to forms of questions:

S Form of Questions Marks for No. of Total
r each Questio Marks
N Questions ns
o.
1 Long Answer types 05 02 10
. (LA)
2 Short Answer Type 03 05 15
. (SA– I)
3 Short Answer Type 02 11 22
. (SA– II)
4 Very Short Answer 01 13 13
. Type (VSA)
TOTAL 31 60

3. Expected Time for different types of questions should be as follows

Sr No. Forms of Approx. Time No. of Approx. Time
Questions for each Questio for each form
Question in ns (n) of Questions
mins in
(t) mins (n x t)
1. Long Answer 0 2 x14min= 28
types 14mi 2
(LA) n
2. Short Answer 07 0 5 x 07min =
Type min 5 35
(SA – I)
3. Short Answer 05 1 11 x 05min =
Type min 1 55
(SA – II)
4. Very Short Answer 02 1 13 x 02min =
Type (VSA) min 3 26
TOTAL 3 144 mins
1

As the total time is calculated on the basis of the number of questions required
to be answered and the length of their anticipated answers. It would, therefore
be advisable for the candidates to budget their time properly by cutting out the
superfluous words and be within the expected time limits.
Scheme of options
(There will be no overall choice. However, there is an internal choice in 01 sub
question of 05 marks, 03 marks & 02 marks category)

4. Weightage to difficulty level of Questions

Sr No. Estimated Difficulty Level of Percenta
Questions ge
1. Easy 30 %
2. Average 50 %
3. Difficulty 20 %
Total 100%
Question paper will have three sections A, B, C, D.
a. Section A will have 13 questions of 01 mark. (7 MCQ questions)
b. Section B will have 11 questions of 02 marks. (1 internal choice)
c. Section C will have 05 questions of 03 marks. (1 internal choice)
d. Section D will have 02 questions of 05 marks. (1 internal choice)
e. Question shall be from all the chapters specified above.
f. Total number of questions will be 31.

Ms. Meeta Bandekar
( Convenor)

GOA BOARD OF SECONDARY AND HIGHER SECONDARY
EDUCATION
ALTO – BETIM 403521
DESIGN OF THE QUESTION PAPER
FIRST TERM EXAMINATION (2024-25)
STD: XII

TIME: 2hrs SUBJECT: BIOLOGY PRACTICAL MAX. MARKS: 20

Q1. Physiology Experiment --------- 6mks
Q.2 Temporary mounting--------------- 4mks
Q.3 Identification ------------------------ 6mks
Q.4 Journal / Viva ------------------------4mks

(Only those experiments may be included for the practical exam whichever are completed during
the first term)

Blue print of the Model question paper
Std: XII
Sub: Biology
2024-25

Unit Chapter M Objectives T
/Content ar Skill ot
Area ks Knowledge Understanding Application al
40%(28 marks) 30%(21 marks) 10%(7marks) 20%(14 marks)

VS SA SA LA VS SA SA LA VS SA SA LA VS SA SA L
A (2) (3) (5) A (2) (3) (5) A (2) (3) (5) A (2) (3) A
(1) (1) (1) (1) (5)

Repr 2.Sexual 06 2(1 1(1 2(1 1( 0
oduct Reprodu ) ) ) 1) 6
ion ction in
flowerin
g plants

3.Huma 06 1(1 2(1 2(1 1( 0
n ) ) ) 1) 6
Reprodu
ction

4.Repro 04 3(1 1(1 0
ductive ) ) 4
Health

Genet 5.Princi 06 5(1 1( 0
ics ples of ) 1) 6
and inherita
evolut nce and
ion variatio
ns

6.Molec 07 2(2 2(1 1( 0
ular ) ) 1) 7
basis of
Inherita
nce

7.Evolut 05 2(1 3( 0
ion ) 1) 5

Biolo 8.Huma 09 1(2 5(1 2(1 0
gy in n health ) ) ) 9
huma and
n diseases
welfa
re

10.Micr 03 3(1 0
obes in ) 3
human
welfare

Biote 11.Biote 1(1 5(1 2( 0
chnol chnolog 08 ) ) 1) 8
ogy y:
and Principl
its es and
applic Processe
ations s

12.Biote 03 3(1 0
chnolog ) 3
y and its
applicati
ons

Ecolo 13.Orga 05 2(1 3(1 0
gy nisms ) ) 5
and
populati
on

14.Ecosy 04 1( 2( O
stem 2) 1) 4

15.Biodi 04 1(1 2(1 1( 0
versity ) ) 1) 4
and
conserva
tion

Total 70 28 21 07 14 7
0

NOTE: Figures within the bracket indicate number of questions and figures outside the

bracket indicate marks.

Biology Model Paper-2024-25

Std : XII Time : 3 Hours Maximum marks : 70

Instructions :

(i) All questions are compulsory.
(ii) Draw diagrams in lead pencil only.
(iii) The question paper consists of four (4) Sections A, B, C and D.
● Section A has 13 questions of 01 mark each.
● Section B has 12 questions of 02 marks each.
● Section C has 06 questions of 03 marks each.
● Section D has 03 questions of 05 marks each.
(iv) The total number of questions is 34.
(v) There is no overall choice, however an internal choice is provided in two questions of
Section B, one question of Section C and two questions of Section D.
(vi) Multiple choice questions should be attempted only once, if attempted more than once
it will not be evaluated. Choose the correct option and rewrite on the

Section A ( 1 mark each )

1. Thermus aquaticus is used to isolate an enzyme used to make billion copies of a gene. Identify
the enzyme.
● DNAse
● DNA polymerase
● RNA ligase
● RNA polymerase
2. E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only
lactose as the source of energy because —---
● They cannot absorb lactose
● They cannot produce functional beta galactosidase
● Lactose is not a good energy source
● Mutated E. coli die if lactose enters their cytoplasm.
3. In Indian culture, tracts of forest are set aside, and the trees and wildlife within are venerated
and given total protection. The term used for these tracts of forest is------
● Natioal parks
● Biosphere reserves
● Sacred groves
● Hot spots
4. A wolf feeding on a deer is a ------
● Primary consumer and herbivore
● Secondary consumer and primary carnivore
● Primary consumer and primary carnivore
● Secondary consumer and secondary carnivore
5. An example of an ecological succession that leads from xeric to mesic condition is seen when
-------
● Pioneer species are Phytoplanktons.

● A pond is newly created
● Rocks start weathering to form soil
● A forest fire destroys all the plants
6. A drawback for natural methods of contraception can be-------
● Hospitalization
● Hormonal imbalance
● Surgery
● Side effects
7. Pistillate flowers of maize are known to exhibit -------
● Autogamy and geitonogamy
● Autogamy only
● Xenogamy only
● Geitonogamy and xenogamy
8. Formation of corpus luteum occurs during-----------
● Ovulation
● Luteal phase
● Follicular phase
● Menstrual phase
9. Draw a neat diagram of L.S. of Apple.
10. Your classmate complains of cough and headache. The Doctor confirms that he is suffering
from common cold and not pneumonia on the basis of certain symptoms. Deduce any 2 of these
symptoms.
11. In case of a venomous snake bite, an injection is given to the patient. What does the injection
contain?
12. Vedant and his friends rescued an injured Deer from a nearby forest and after medical
treatment handed it over to the forest officials for conserving it in a Zoological park. Give the
term used for this approach of biodiversity conservation.
13. Name the type of sex determination pattern seen in the picture.

Section B ( 2 marks each )

14. Draw a neat diagram of the structure of a typical anatropous ovule.
15. Describe in brief the adaptations seen in flowers pollinated by insects.
OR
Describe in brief the structure of microsporangium.
16. Differentiate between the process of Spermatogenesis and Oogenesis in humans. ( 2 points )
17. The small standing crop of phytoplanktons feeds a large standing crop of zooplanktons .
Describe the shape of pyramid of biomass and pyramid of energy in this example giving reasons.
18. Define adaptive radiation give an example that Darwin studied on Galapagos Island.
19. DNA is better genetic material than RNA. Justify the statement.
20. In order to resolve a paternity dispute, the High Court directed Pinto family to undergo a
DNA test. The VNTRs patterns of DNA samples of the parents and the child were matched by
Southern blot hybridisation technique. List the major steps involved in the process.
21. Draw a neat diagram of DNA double helix.
22. Invasion by alien species causes biodiversity loss. Explain with an example.

23. Which enzymes will have to be used to break open cells of the mango tree and that of
mushroom respectively by research students of Biotechnolgy Institute in order to release their
DNA?
24. Describe the role of Light as an abiotic factor in the environment.
OR
Describe the behavioural responses shown by desert lizard to cope with variations in their
environment.
25. A cancer patient was advised to go for immunotherapy treatment. What is administered in his
body and how will it work?

Section C ( 3 marks each )

26. Draw a neat diagram of the structure of the Human sperm. Name and label the part that
secretes enzymes for fertilization.
27. Explain the different types of IUDs and their mode of action.
OR
Explain the surgical methods of contraception.
28. In a population of 1000 parakeets in a given area the number of individuals with long tail
feathers ( Allele L is dominant) were 800 and those with short tail feathers ( allele l is recessive)
were 200. What would be the frequencies of dominant allele L and recessive allele l in this
population? Also find out the number of heterozygous dominant individuals using Hardy
Weinberg equation. Show your calculations.
29. Gene therapy can be used as a cure for ADA deficiency. Explain.
30. What are ‘flocs’? State their role in effluent treatment and their ultimate fate in the sewage
treatment tank.
31. Write a note on Suspend as a response to abiotic factors.

Section D ( 5 marks each )

32. Discuss in detail Haemophilia and Sickle cell anaemia as Mendelian disorders.
OR
Discuss in detail Colour blindness and Thalassemia as Mendelian disorders.
33. What are Restriction enzymes? Describe in detail the role of restriction enzymes as a tool in
recombinant DNA technology.
OR
What are cloning vectors? Describe in detail the features that are required to facilitate cloning
into a vector.
34. Drug and alcohol abuse is common among some youngsters. Explain measures useful for its
prevention and control.

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