PSEB 12th Sample Paper 2024 Biology

Punjab Board
2024

PUNJAB SCHOOL EDUCATION BOARD
Biology (DA Code)
Class 10+2 Max marks 70 Time 3 Hours
Note:

• Question paper has three sections A, B, and C with total 30 questions.
• Section A has 23 questions of 2 marks each. Out of these 6 questions are
multiple choice questions, 5 are match the column, 6 are fill in the blanks
with given options and 6 are true or false
• Section B has Question no. 24 to 27 of three marks each. There is 100%
internal choice in each question.
• Section C has Question no. 28-30 of four marks each. There is 100%
internal choice in each question.

Section A
Multiple Choice questions
Q1) Removal of anther from flower bud before the dehiscence of anther is
called
A. Emasculation
B. Bagging
C. Tagging
D. None of the above
Q2) In man, the sperms are produced in:
A. Seminiferous tubules
B. Vasa efferentia
C. Rete testis
D. Vas deferens
Q3) Down’s Syndrome occurs due to trisomy of
A. 21st chromosome
B. 14th chromosome
C. 3rd chromosome
D. 15th chromosome
Q4) Malarial parasite requires two hosts to complete its life cycle, these are
A. Human and Mosquito
B. Human and Housefly
C. Human and pig
D. Mosquito and Pig
Q5) Large Scale production of desired products of recombinant DNA
technology is done in.
A. Glass flask
B. Bioreactors
C. Steel tanks
D. All of the above
Q6) Which one of the following has the largest population in a food chain?
A. Producers
B. Primary Consumers
C. Secondary consumers
D. Decomposers 6X2=12

Fill in the blanks

1

Q7) The process of fusion of gemetes is called-------------- .
(Fertilisation/embryogenesis)
Q8) Agrobacterium tumefaciens is known as ………..genetic engineer of
plants. (natural/artificial)
Q9) The number of individuals inhabiting per unit area --------------.
(Population density/Population Frequency)
Q10) The large holes in swiss cheese are due to production of a large
amount of ---------------by a bacterium. (Oxygen/Carbon
dioxide)
Q11) The organisms which can tolerate and thrive in a wide range of
temperatures are called ……………. (Eurythermal/Stenothermal)
Q12) Dodo bird is example of --------------- organism. (Extinct/Endangered)
6X2=12

True or False

Q13) Leydig cells are found in ovary.
Q14) Mendel studied total nine characters of garden pea.
Q15) A cross between F1 hybrid and one of the dominant parent is called
test cross.
Q16) Evolution is a discontinuous process.
Q17) Polar bears goes into aestivation during winter..
Q18) The green plants are called producers. 6X2=12

Match the Column A with B

Q19)
Column I Column II
i. In human female, the first (a) Menopause
menstruation is called
ii. Corpus luteum secretes (b) Menarche

(c) Progesterone

Q20)
Column I Column II
(i) Start codons a) UAA,UAG,GUG
(ii) Stop codons b) AUG, GUG

c) UAA, UAG, UGA
Q21)
Column I Column II

(i) Ascariasis (a) Ascaris lumbricoides
(ii) Filariasis (b) Micosporum
(c) Wuchereria bancrofti

Q22)
Column I Column II

2

(i) Nicotine (a) Alcohol
(ii) Liver Cirrhosis (b) Tobacco plant
(c) Caffeine

Q23)
Column I Column II
(i) Hind II (a) Restriction Endonuclease
Enzyme
(ii) pBR322 (b) selectable marker
(c) Cloning vector

5X2=10

Section B

Each question carries 3 marks

Q24) What are characters of flowers pollinated by insects?
OR
What is amniocentesis?

Q25) What are homologous organs. Give an example.

OR
What do you mean by semi-conservative mode of DNA replication.
Q26) Define biotechnology. Write any two applications of biotechnology.
OR

Write a short note on Gene therapy.
Q27) Define Mutualism and give one example.
OR

What makes India one of the 12 mega diversity countries of the world?
4X3=12

Section C

Each question carries 4 marks

Q28) What is triple fusion? Where and how does it take place.?
OR

Give a brief account of male reproductive system.
Q29) Differentiate between co-dominance and incomplete dominance.
OR
Write down any three points of difference between monohybrid &
dihybrid cross.
Q30) List the harmful effects of alcohol or drug abuse.
OR
Name of the causative agent of Malaria. Write its symptoms also. 3X4=12

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