MBOSE Class 12 Question Paper 2024 for Biology

Meghalaya Board of School Education

QUESTION
PAPERS

Total No. of Printed Pages—8
HS/XII/Sc/Bio/24
2024
BIOLOGY
( Theory )

Full Marks : 70
Time : 3 hours

General Instructions :
(i) Write all the answers in the Answer Script.
(ii) Attempt all parts of a Group serially in one place.
(iii) All questions are compulsory.
(iv) The figures in the margin indicate full marks for the questions.
(v) This question paper consists of 5 (five) Groups—A, B, C, D
and E.
Group—A consists of 12 questions (multiple-choice type)
of which 10 questions are to be answered. Each question
(Q. Nos. 1–12) carries 1 mark.
Group—B consists of 7 questions (very short-answer type)
of which 5 questions are to be answered. Each question
(Q. Nos. 13–19) carries 1 mark and to be answered in
one word/sentence.
Group—C consists of 5 questions (short-answer type—I). Each
question (Q. Nos. 20–24) carries 2 marks with alternatives to
be answered in 20–30 words.
Group—D consists of 12 questions (short-answer type—II)
of which 10 questions are to be answered. Each
question (Q. Nos. 25–36) carries 3 marks and to be answered
in 30–40 words.
Group—E consists of 3 questions (long-answer type). Each
question (Q. Nos. 37–39) carries 5 marks with alternatives to
be answered in 60–80 words.

/31 [ P.T.O.

( 2 )

GROUP—A
Choose and write the correct answer of the following (any ten) :
1×10=10

1. Development of fruit without fertilization is called

(a) polyembryony

(b) parthenocarpy

(c) parthenogenesis

(d) apomixis

2. Formation of mRNA from DNA is called

(a) transcription

(b) translation

(c) replication

(d) duplication

3. The protein which is secreted by virus-infected cells to
protect non-infected cells is called

(a) antigen

(b) antibody

(c) antibiotic

(d) interferon

HS/XII/Sc/Bio/24/31 [ Contd.

( 3 )

4. Which microbe is involved in the production of curd from
milk?
(a) Lactobacillus bulgaricus
(b) Lactobacillus acidophilus
(c) Lactobacillus thermophilus
(d) Streptococcus thermophilus

5. Archaeopteryx is the missing link between
(a) man and apes
(b) birds and mammals
(c) amphibians and reptiles
(d) reptiles and birds

6. In recombinant DNA technology, the enzyme used for
cutting DNA is
(a) DNA polymerase
(b) DNA ligase
(c) RNA polymerase
(d) restriction endonuclease

7. Tubectomy, a method of population control, is performed
on
(a) both males and females
(b) males only
(c) females only
(d) pregnant females only

HS/XII/Sc/Bio/24/31 [ P.T.O.

( 4 )

8. Which of the following is an in-situ method of conservation
of biodivesity?

(a) Sacred Groves

(b) Zoological Parks

(c) Botanical Gardens

(d) Wildlife Safari Parks

9. Trisomy of the 21st chromosome causes

(a) Klinefelters syndrome

(b) Turner’s syndrome

(c) Sickle cell anaemia

(d) Down’s syndrome

10. Pollination by snail is called

(a) myrmecophily

(b) entomophily

(c) ormithophily

(d) malacophily

HS/XII/Sc/Bio/24/31 [ Contd.

( 5 )

11. Bacteria and fungi are

(a) producers

(b) primary consumers

(c) scavengers

(d) decomposers

12. Unauthorised use of bioresources of one country by
another country without proper consent is referred to as

(a) biopiracy

(b) biopatent

(c) biowar

(d) biocontrol

GROUP—B
Answer the following questions in one word/sentence each
(any five) : 1×5=5

13. What is emasculation?

14. Write the full form of IUDs.

15. Define polyploidy.

16. Define population.

HS/XII/Sc/Bio/24/31 [ P.T.O.

( 6 )

17. What do you understand by the term ‘biotechnology’ ?

18. Name two primary lymphoid organs.

19. What is Red Data Book?

GROUP—C

20. Differentiate between Antigens and Antibodies. 2

21. Draw a labelled diagram of a female reproductive system
of human beings. 2

Or

Draw a diagrammatic representation of various events
during menstrual cycle.

22. Differentiate between leading and lagging strand of DNA. 2

Or

Define convergent evolution with an example.

23. Define transcription unit with the help of a simple
diagram. 1+1=2

24. Define mutualism with an example. 1+1=2

HS/XII/Sc/Bio/24/31 [ Contd.

( 7 )

GROUP—D
Answer the following questions (any ten) : 3×10=30

25. What is double fertilization? Write the importance of
double fertilization. 1+2=3

26. State and explain Mendel’s Law of Independent
Assortment with an example. 1+2=3

27. Explain the role of microbes in energy production. 3

28. Write a brief note on the application of genetic engineering
in medicine. 3

29. State Hardy-Weinberg Principle. Write two factors which
affect this principle. 2+1=3

30. Explain the development of nuclear and cellular type of
endosperm. 1½+1½=3

31. What is DNA fingerprinting? Write the applications of DNA
fingerprinting. 1+2=3

32. Describe briefly the process of energy flow in an
ecosystem. 3

33. Work out a cross showing marriage between a
haemophilic man and a carrier woman. Write the
phenotype of their children. 2+1=3

34. What is primary productivity? Differentiate between
primary and secondary productivity. 1+2=3

HS/XII/Sc/Bio/24/31 [ P.T.O.

( 8 )

35. Define linkage. Write the differences between complete
linkage and incomplete linkage. 1+2=3

36. How are gene of interest amplified in genetic engineering? 3

GROUP—E
37. Define fertilization. Where does this process take place in
a female body? Describe the process of fertilization in
humans. 1+1+3=5

Or
What is an operon? Explain the regulation of gene
expression in lac operon with suitable diagrams. 1+3+1=5

38. What are ecological pyramids? Draw and explain the
ecological pyramids of number and energy. 1+1+3=5

Or
What is DNA replication? Explain the process of DNA
replication with suitable diagrams. 1+3+1=5

39. Define Human Genome Project (HGP). Write the salient
features of the Human Genome Project. Write two
applications of HGP. 1+3+1=5

Or
What is cancer? Name the different types of cancer.
Differentiate between Benign tumour and Malignant
tumour. 1+2+2=5

HHH

HS/XII/Sc/Bio/24/31 24K—5200

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