AHSEC| CLASS 12| BIOLOGY| QUESTION PAPER - 2020| H.S. 2ND YEAR
2020
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 do you mean by Bt? 1
2. What is conidia? 1
3. Give an example of endomycorrhiza. 1
4. What is gene pool? 1
5. Write on adaptation of xerophytes. 2
6. How plant tissue culture has helped in
improvement of crops? 2
7. How is insulin produced through genetic
engineering? 2
Or
What is palindrome? Give an example of palindromic sequence.
8. What is triple fusion? Write the
significance of it. 2
Or
Write briefly on artificial vegetative reproduction in plants.
9. What is cellular totipotency? What is
the importance of it in plant science? 2
10. Explain briefly? (any two) 2+2=4
(i) Genetic therapy
(ii) PCR
(iii) Endonuclease.
11. Write the scientific names with
utilities of the following plants: (any three) (0.5+0.5)x3=3
(a) Teak
(b) Jute
(c) Cinchona
(d) Tea
12. What is single cell protein (SCP)? Name
two algae that are used to produce SCP. 2
13. What are the advantages of cross-pollination?
3
Or
What is parthenocarpic fruit? How can the formation of such fruits
be induced?
14. Describe the facts on which Darwin’s
theory is based. 4
Or
What is Organic evolution? What briefly about any one evidence of
Organic evolution. 1+3=4
15. Define biotechnology. Write the
applications of biotechnology in medical science. 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) The germinal epithelium of gonads is called _________.
(b) The animals that are created with genes introduced from other
organisms are called _______.
(c) Gross Primary Productivity – Respiratory losses = ________.
(d) ______is a starting codon.
2. Answer any two: 1x2=2
(a) What is genetic code?
(b) What is the function of mitochondria in sperm?
(c) What are the coacervates?
(d) In which year the Government of India Promulgated the
Environment (Protection) Act?
3. Answer any four: 2x4=8
(a) What is sex-linked inheritance? Give one example.
(b) Write briefly about ‘Central Dogma’ of Molecular biology.
(c) What is genetic drift? Give one example.
(d) What is ecological niche? Give one example.
(e) Write four primary signs of Cancer.
(f) What are the characteristics of Acquired Immunity?
4. Write the differences between: (any
two) 2x2=4
(a) B-lymphocytes and T-lymphocytes
(b) Food chain and food web
(c) Linkage and crossing over
(d) Blastula and Morula.
5. Draw a labelled diagram of T.S. of
ovary. 3
Or
Draw a labelled diagram of replicating fork in DNA helix. 3
6. What is drug? Write about Psychotrophic and
Psychedelic drugs. 1+2=3
Or
What is Pisciculture? Write the various types of ponds. 1+2=3
7. What is Human Genome Project? Write
about the goals of Human Genome Project. 1+2=3
Or
Write the scientific name of Muga Silkworm. Mention two host plants
of Muga Silkworm. 1+2=3
8. Describe the structure of Ecosystem. 5
Or
Describe the mechanism of transcription. 5
9. Describe various Assisted Reproductive
Technologies used to solve the Infertility problems. 5
Or
Describe the various chromosomal disorder genetic diseases. 5
***
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