AHSEC| CLASS 12| BIOLOGY| QUESTION PAPER - 2022| H.S. 2ND YEAR
2022
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 Page No. 1 - 6 PART-II (ZOOLOGY) MARKS - 35 Page No. 7 – 11 |
Use separate Answer scripts for
Part-I (Botany) and Part-II (Zoology)
Part-I (Botany)
1. What is Plasmid? 1
2. Name the plant body where bisexual and both unisexual
male and female flowers are present.
1
3. Write full forms of VAM. 1
4. Who proposed Mutation theory? 1
5. What is biogas?
2
6. Name two antibiotics produced from fungi. 1+1=2
7. How is DNA isolated in purified form from a bacterial cell? 2
Or
What is
recombinant DNA? List the tools of Genetic Engineering. 2
8. What is triple fusion? Name the nuclei involved in the process.
1+1=2
Or
What is meant by
polyembryony in angiosperm? Write its importance. 1+1=2
9. What is totipotency of the cell? Write its importance in
Plant science. 1+1=2
10. Explain briefly: (any two) 2+2=4
(i) Gene Gun
(ii) Biopatent
(iii) Gene
Cloning.
11. Write the scientific names with their utilities of
the following plants: (any three) ½+½x3=3
(i) Tobacco
(ii) Tulsi
(iii) Jute
(iv) Coffee
12. How do biofertilizers enrich the fertility of the
soil? 2
13. Describe the process of development of female
gametophyte in Angiosperm with suitable diagram. 3
Or
Explain any
three outbreeding devices that flower influence the plants have developed to
encourage cross-pollination. 3
14. Write briefly on Modern Synthetic Theory of
Evolution. 4
Or
Describe the
factors involved in the process of organic evolution. 4
15. Define Biotechnology. Write briefly on the main aims of
biotechnology. 1+4=5
Or
Write an account
on biotechnological application in medicine.
5
Part – II (Zoology)
1. Fill in the blanks: (any two) 1x2=2
(a) The main
function of interstitial cells of seminiferous tubules is _______.
(b) ________ proposed
that nuclei are the bearers of hereditary characters.
(c) The AUG
codon is called _____.
(d)
Elephantiasis is caused by ________.
(e) Greenhouse
effect is mainly caused due to ________.
2. Answer any two:
1x2=2
(a) What is ‘Template
strand’?
(b) Define Test
cross.
(c) What is the
function of mitochondria in a sperm?
(d) What are ‘Transgenic
Animals’?
3. Answer any four:
2x4=8
(a) What is Menstrual
cycle? Which hormones control the menstrual cycle?
(b) What is
Point mutation? Give one example.
(c) What is Adaptive
radiation? Give one example.
(d) Define
Ecological pyramid with one example.
(e) Define
Endemism. Give one example of endemic animal of Assam.
(f) What do you
mean by replication? Define semiconservative DNA replication.
4. Write the differences between: (any two) 2x2=4
(a) Homozygous
and Heterozygous
(b) Linkage and
Recombination
(c) Aneuploidy
and Polyploidy
(d) Vaccination
and Immunisation.
5. Draw a labelled diagram of T.S. of ovary. 3
Or
Draw a labelled
diagram of double helical structure of DNA.
3
6. What are the sexually transmitted diseases? Mention the
various causes of these diseases. 1+2=3
Or
Mention the
effects of drugs and alcohols. 3
7. Write the salient features of Human Genome. 3
Or
Write the
various reasons of the loss of Biodiversity.
3
8. Describe the various chromosomal disorders. 5
Or
Describe about
the Pedigree analysis. 5
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