UP Board Class 12th Model Paper 2023 Biology

Model Paper-2021-22

Biology (only Question Paper)

Class-12

Time – 3 hours 15 minutes MM-70

Note- First 15 minutes are allotted for the candidates to read the question paper.

Instructions-

I. All questions are compulsory
II. Illustrate your answers with labelled diagrams wherever necessary.
III. Marks allotted to each questions are mentioned against it.

1- Choose the correct option and write in your answer book :

a) Which of the following part represents the male sex organ of the flower- 1
i. Stamen
ii. Pistil
iii. Megasporangium
iv. Pollination
b) In Human, sex of baby determined by- 1
i. Sex chromosome of mother
ii. Size of ovum
iii. Size of sperm
iv. Sex chromosome of father
c) Genetic engineering is used in – 1
i. In Medicine
ii. In Agriculture
iii. In both (i) and(ii)
iv. None of these
d) Lichen, which is responsible for ecological succession, in fact it shows
symbiotic relation between 1
i. Algae – bacteria
ii. Algae- fungi

iii. Bacteria - fungi
iv. Fungi- bacteria

2- Very short answer type questions-

a) Write chromosome number in klinefelter and turnor syndrome. 1
b) By which division do male germinal cells form sperms? 1
c) What is the number of chromosomes in pollen grain mother cell? 1
d) Write the name of enzyme which breaks the DNA in small segments. 1
e) What are plants called due to carbon dioxide fixation? 1

3- Short answer type questions- I

a) Define sex determination in birds. 2
b) Draw well labelled diagram of double helix DNA model proposed by Watson
and crick. 2
c) What is immunity? 2
d) An orchid plant is growing on the branch of mango tree. How would you
describe the interaction between these two? 2
e) Draw clean linear diagram of biological response. 2

Short answer type questions-II

4 – a) Write any three differences between microsporangia and megasporangia. 3

b) In our society, when girls are born, only women are blamed. Define why it
is not correct. 3

c) Define Mendol’s Law of dominance with the help of monohybrid cross. 3

d) Which feature of DNA – helix help Watson and Crick to propose semi –
conservative hypothesis of DNA replication? Define it. 3

5 – a) Draw clean and labelled diagram of life – cycle of Malaria parasite. 3

b) How biological studies help us to control infectious diseases? 3

c) How biological fertilizers help to increase soil fertility? 3

d) What are Baculoviruses? 3

6– a) Write down short notes on the following – 3

i.PCR
ii.Restriction endonuclease enzyme
b) What is the use of genetic engineering in field of agricultures? 3
c) What do you understand by transgenic animal?Give any one 2+1
example.
d) Differentiate between the following - 3
i.Hibernation and Astivation
ii.Ectothermic and Endothermic
Long answer type question-
7 – Describe human’s male reproductive system with the help of labelled 2 + 2 +1

diagram. Where do sperms store in the system?

OR

Define microsporogenesis in flowering plants with the help of labelled 3+2

diagram.

8- What is genetic code? Define main characterstics of genetic code. 2+ 3

OR

What is Mendol’s Law of segregation? Define it with the help of checker board.
Why it is called as Law of purity of gamets? 2+2+1

9 – What is adaptation? Explain with the help of examples. 2+3

OR

What are the main reasons of race damage (species degradation) in any 5
geographical areas?