ASSEB| CLASS 12| BIOLOGY| QUESTION PAPER - 2025| H.S. 2ND YEAR
2025
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. What is the palindrome of TATA?
2. Name an example of a plant where both
cleistogamous and chasmogamous flowers are present. 1
3. Name one microbe used in biofertilizers.
1
4. What is meant by speciation? 1
5. Write on adaptation of either
hydrophytes or xerophytes. 2
6. How plant tissue culture has helped in
improvement of crops? 2
7. Write briefly about application of
electrophoresis. 2
Or
Write brief account on ethical issues on biotechnology.
8. What is meant by double fertilization in
angiosperms? 2
Or
Write briefly on artificial vegetative reproduction in plants.
9. What is cellular totipotency? What is
the importance in plant science of it? 2
10. Explain briefly: (any two)
(i) Genetic therapy
(ii) Bioreactor
(iii) Transgenesis
(iv) Endonuclease
11. Write the scientific name with their
utility of the following plants: (any three) (0.5+0.5)x3=3
(i) Teak
(ii) Jute
(iii) Rauwolfia
(iv) Coffee
12. Write the applications of mychorrhiza.
2
13. What are the cells present in a typical
matured embryo sac of angiosperms? 3
Or
What is parthenocarpic fruit? How can induce the formation of such
fruits?
14. Write briefly on modern synthetic
theory of evolution. 4
Or
What is Organic evolution? Write briefly about any one evidence of
Organic evolution. 1+3=4
15. Define biotechnology. Write the
applications of biotechnology in agriculture. 1+4=5
Or
What is plasmid? Write briefly on the main aims of biotechnology.
Part-II (Zoology)
1. Fill in the blanks: (any two) 1x2=2
(a) _______is the full form of PCR.
(b) _______is the name of a bacteria which produces Bt-toxin.
(c) ________is a contagious disease.
(d) ________hormone induces ovulation.
2. Answer any two: 1x2=2
(a) What is HIV?
(b) Which bacteria causes typhoid?
(c) Write one cause of water pollution.
(d) What are alleles?
3. Answer any four: 2x4=8
(a) What is co-dominance?
(b) What do you mean by Sexually transmitted disease? Name one
sexually transmitted disease.
(c) What is Law of Segregation?
(d) What is Biodiversity hot spot?
(e) What are the main causes of cancer?
(f) What are the effects of drugs/ alcohol abuses?
4. Write the differences between: (any
two) 2x2=4
(a) DNA and RNA
(b) Morula and Blastula
(c) Linkage and Recombination
(d) Innate immunity and Acquired immunity
5. Draw a labelled diagram of Watson and
Crick model of semi-conservative replication of DNA. 3
Or
Draw a labelled diagram of T.S. of testis. 3
6. Write the scientific name of Muga
silkworm. What are the diseases of silkworm? 1+2=3
Or
What
do you mean by Transcription and Translation? Explain. 1.5+1.5=3
7. What do you mean by mutation? Write
about the different types of mutation. 1+2=3
Or
What is gene migration? Write about genetic drift. 1+2=3
8. Describe the Hardy-Weinberg law. 5
Or
Prove that DNA is the genetic material by Hershey and Chase
experiment. 5
9. What is Food Chain? Write about the
trophic level of food chain. 5
Or
Describe the chromosomal theory of inheritance. 5
***
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