Assam Board Class 12 Sample Paper 2025 Biology

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Assam Board Class 12
Sample Question Paper

BÊOLOGY
(Theory)
Full Marks : 70
Pass Marks : 21

Time : Three hours

The figures in the margin indicate full marks
for the questions.

PART-I (BOTANY)
MARKS - 35
Page No. 2-6

PART-II (ZOOLOGY)
MARKS - 35
Page No. 7- 11

Use separate Answer scripts for Part-I (Botany)
andPart-II (Zoology)
Contd.

Part-I (Botany)
( st btsAsa)

1
1. Name the enzyme which help in unwind of the DNA helix.

1
2. Where is occurred coleoptile?

1
3. What is cellular totipotancy ?

1
4. What is meant by speciation ?

2
5. What do you mean by Biofertilizer ?

1+1=2
6. Name the microbes used for production of curd and vinegar.

33T BIOL (BOT-ZOO) [21

How DNA isolated in Purified from a bacterial cell? 2
7.

DNA (AA

Or/q

What is recombinant DNA 2List the tools of genetic engineering,

8. Write briefly about application of electrophoresis. 2

Or/ q

Write brief account on ethical issues on biotechnology. 2

9. Write the applications of mychorrhiza. 2

33T BIOL (BOT-ZO0) [31 Contd.

10. Explain briefly :(any 2+2-4
two)

(i) Cry protein

(ii) Transgenesis

(iii) Bioreactor

11. Write the scientific name with their utility of the
following plants :
(any three)
(+)x3=3

foft)
() Sarpagandha

(ii) Beladona

(iüi) Arjun

(iv) Teak

33T BIOL (BOT-ZOO) 14]

12. - Write the characteristics ofpopulation. 2

13. What are the major Steps of gene cloning? Write briefly on each steps of
gene cloning. 1+2-3

Or/

Write an account of biotechnological application in agriculture. 3

14. Write brief account on organic evolution. 4

Or/ qe

What is coacervate ? How do fossils evidence organic evolution ?
1+3=4

33T BIOL (BOT-ZOO) [5] Contd.

15. Write an account on the development dicotyledonous embryo with5
labelled iagram.

Or/qe

Write an account on the structure of a typical ovule with labelled diagram.
5

33T BIOL (BOT-ZOO) [6]

Part-II (}oology)

1. Fill in the blanks :
(an' two) 1x2=2

(a) Ovulation is induced by

(b) DNA finger printing is first discovered by

(c) The Nobel Prize in Physiology or Medicine in 2022 is awarded in

(d) AIDS is caused by

2. Answer any two : 1x2=2

laj What is transgenic animal ?

33T BIOL (BOT-ZOO) [7] Contd.

(b) What is menopause ?

() What is DNA inger printing ?

(d) Mention one cause of sound pollution.

3. Answer any four: 2x4=8

(a) What is sex linked inheritance ? Give one example.

(b) Write the scientific nameof Muga silk worm. Mention one host plant
of Muga silk worm.

(c) What is CuT ? Write its use.

(d) What is world heritage site ? Mention one world heritage site of
Assam.

33T BIOL (BOT-ZOO) [8]

(e)
Define drug. Write one Psychotrophic drug.

4.
Write the differences between : (ay too) 2x2=4

(a) Morula and blastula

(b) Parturition and lactation

(c) Incomplete dominance and co-dominance

(d) Active Immunity and Passive Immunity

(e) Transcription and Translation

5. Draw a labelled diagramn of the matured human sperm.

33T BIOL (BOT-ZOO) [9] Contd.

Or/
semiconservative
of
Draw a labelled of Watson and Crik model 3
digram
replicaiton of DNA.

biodiversity hotspot? Write the name of
6 What do you mean by 1+2=3
biodiversity hotspot of India.

Or/ weT
1+2-3
RNA.
What is transcription unit ? Write about types of

. 1+2=3
genetic drift.
7. What is gene migration ? Write about the

origin of life.
8. Describe the Miller's experiment to provide idea about the 5

Or/weA

level in the
Describe the process of energy flow in different trophic
5
ecosystem.

33T BIOL (BOT-ZOO) [10]

9. Describe the
chromosomal theory of inheritance. 5

Or/ q

Describe the FHardy-Weinberg principle. 5

33T BIOL (BOT-ZOO) [11]

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