AHSEC| CLASS 12| BIOLOGY| QUESTION PAPER - 2023| H.S. 2ND YEAR
2023
BIOLOGY
(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
PART-II
(ZOOLOGY)
MARKS
- 35
Part
- I (Botany)
1. Name the enzyme which help in unwind of the DNA helix. 1
2. Where is occurred coleoptile? 1
3. What is cellular totipotency? 1
4. What is meant by speciation? 1
5. What do you mean by Biofertilizer? 2
6. Name the microbes used for production of
curd and vinegar. 1+1=2
7. How DNA isolated in purified from a
bacterial cell? 2
Or
What is recombinant DNA? List the tools of genetic engineering. 2
8. Write briefly about application of
electrophoresis. 2
Or
Write brief account on ethical issues on biotechnology. 2
9. Write the applications of mycorrhizae. 2
10. Explain briefly: (any two) 2+2=4
(i) Cry protein
(ii) Transgenesis
(iv) Bioreactor
11. Write the scientific name with their
utility of the following plants: (1/2+1/2)x3=3
(i) Sarpagandha
(ii) Beladona
(iii) Arjun
(iv) Teak
12. Write the characteristics of
population. 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
What is coacervate? How do fossils evidence organic evolution? 1+3=4
15. Write an account on the development of dicotyledonous
embryo with labelled diagram. 5
Or
Write an account on the structure of a typical ovule with labelled
diagram. 5
PART
- II (Zoology)
1. Fill in the blanks: (any 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
(a) What is transgenic animal?
(b) What is menopause?
(c) What is DNA finger 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 name of 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.
(e) Define drug. Write one Psychotropic drug.
4. Write the differences between: (any
two) 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 diagram of the matured
human sperm. 3
Or
Draw a labelled diagram of Watson and Crick model of
semiconservative replication of DNA. 3
6. What do you mean by biodiversity
hotspot? Write the name of biodiversity hotspot of India. 1+2=3
Or
What is transcription unit? Write about types of RNA. 1+2=3
7. What is gene migration? Write about the
genetic drift. 1+2=3
8. Describe the Miller's experiment to
provide idea about the origin of life. 5
Or
Describe the process of energy flow in different trophic level in
the ecosystem. 5
9. Describe the chromosomal theory of
inheritance. 5
Or
Describe the Hardy-Weinberg principle. 5
***
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