AHSEC| CLASS 12| BIOLOGY| QUESTION PAPER - 2016| H.S. 2ND YEAR
2016
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 |
Use separate Answer scripts for
Part-I (Botany) and Part-II (Zoology)
Part-I (Botany)
1. Why grafting is not possible in Monocotyledonous plants? 1
2. Name the unicellular fungi which reproduces asexually by
budding. 1
3. What were the raw materials used in Miller’s experiment?
1
4. What is hidden hunger? 1
5. Define antigen and antibody. 1+1=2
Or
How DNA is
isolated in purified from a bacterial cell? 2
6. Draw the L.S. of a pistil of angiosperms which is ready
to take part in the process of fertilization. 2
Or
What are the cells
present in a developed embryo sac of angiosperms? 2
7. What is polyploidy? Name the chemical used for induction
of polyploidy in plants. 1+1=2
Or
What are the merits
of interspecific hybridization? 2
8. Name two antibiotics that are produced from bacteria
along with names of concerned bacteria. 1+1=2
Or
Name the
microbes used for production of Acetic acid and Lactic acid. 1+1=2
9. How light influences the growth and development in
plants? 2
Or
What are the special
characteristics of parasitic plant? 2
10. Write note on: (any one) 2
(a) Food Chain
(b) Tropic level
11. Write the scientific names with their utility of the
following plants. (0.5+0.5)x3=3
(a) Chinchona
(b) Neem
(c) Rauwolfia
Or
Write the
scientific names and their families of three important timber yielding plants
of Assam. (0.5+0.5)x3=3
12. Explain the significance of mutation in evolution. 3
Or
Discuss the
modern synthetic theory of evolution. 3
13. Discuss the major steps involved in gene cloning. 3
Or
State the basic
steps involved in genetical modification of an organism. 3
14. Why is the pond regarded as the good example of
ecosystem? Explain the path of energy flow in the pond ecosystem. 2+3=5
Or
Although sexual
reproduction is a long, complex process in comparison to asexual reproduction,
but most of the angiospermic plants prefers it. Explain why. 5
15. Discuss the process of development of a 3-celled pollen
grain from microspore mother cell with the help of labelled diagram. 5
Or
What is ecological
pyramid? Explain different types of ecological pyramids with necessary diagram.
2+3=5
Part-II (Zoology)
1. Fill in the blanks: (any two) 1x2=2
(a) Silkworms
belong to the order _______.
(b) The milk of ‘Rosie’,
the first transgenic cow, contains human alpha ________.
(c) The
structure which provides connection between developing foetus and uterus of the
mother is called ________.
(d) Acrosome of
sperm is formed from ________.
2. Answer any two: 1x2=2
(a) Express the genotype
of AB blood group.
(b) What is
algal bloom?
(c) Write the
equation of ‘Species-Area’ relationship in a logarithmic scale.
(d) Write scientific
name of water hyacinth.
3. Write answer of any four of the following: 2x4=8
(a) Explain the
chromosomal theory of inheritance.
(b) What is
Leydig cell? State its function.
(c) Write a note
on sickle cell anaemia.
(d) State four
features of genetic material.
(e) What are the
barriers in innate immunity?
(f) Write the
names of two primary and two secondary host plants of muga silkworm.
4. State the differences between: (any two) 2x2=4
(a) Sex
chromosome and autosome
(b) T lymphocyte
and B lymphocyte
(c) Grazing food
chain and detritus food chain
(d) Follicular
phase and luteal phase of Menstrual cycle.
5. Draw and label the internal structure of the seminiferous
tubule. 3
Or
Write briefly on prevention of
AIDS. 3
6. What do you understand by fishery? State its importance.
1+2=3
Or
What are the
consequences of loss of biodiversity? 3
7. Write the Mendel’s laws of inheritance. 3
Or
Explain
incomplete dominance with example. 3
8. How a healthy person acquires pneumonia? What are the
causative organisms of the disease? State the symptoms of pneumonia. 1+1+3=5
Or
Discuss the
various means of prevention and control of drugs and alcohol abuse. 5
9. Discuss the methodologies involved in the Human genome
project. 5
Or
Discuss the
process of translation of genetic code. 5
***
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