Assam University 2009 B.Sc Zoology TDC Part-II Honours --- Sixth - Question Paper

OTS-09/ ZOOH-6/099

2009
ZOOLOGY (Honours)
Sixth Paper
(Techniques in Biology, Molecular Biology and Immunology, Histology, Biostatistics, Radiation Biology and Toxicology)
TDC Part-II

Full Marks : 70
Pass Marks : 21

Time : three hours

The figure in the margin shows full marks for the ques.

ans all ques.

1. elaborate resolution and magnification power of a microscope? Enumerate the principle and
use of phase-contrast microscope. Write about magnification in transmission electron
microscope (TEM) and scanning electron microscope (SEM). 4+8+2 = 14
Or
elaborate the utilities of staining in biological studies? Enumerate the speciality of
chromatography and electrophoresis as separation techniques. State the basic principle of
paper chromatography with necessary diagrams. 3+4+2+5 = 14

2. What is meant by DNA cloning? Enlist different steps involved in DNA cloning. What is
genomic library? define DNA probes and monoclonal antibodies and mention their
applications in medical sciences. 2+4+2+6 = 14
Or
describe epitope. Differentiate ranging from humoral immunity and cell-mediated immunity. Enlist
the causative organism, mode of transmission, symptoms and control of AIDS. 2+4+8 = 14

3. Write the location of pancreas. define with diagram the histological structure of it.
Enumerate its role as exocrine and endocrine glands. State the functions of spleen.
1+(2+6)+3+2 = 14
Or
(a) What are mean , median and mode?
(b) What is regression?
(c) Find the median and mode for the subsequent body weight (kg) data found froma sample of men:
55, 57, 59, 58, 60, 56, 62, 60, 67, 63, 70, 68, 69, 60.
(d) elaborate standard deviation and variance? calculate standard deviation of the data provided
above. 3+2+4+(2+3) = 14

4. What do you understand by radioactivity? elaborate alpha, beta and gamma emissions? What
is half life? provide a detailed account of biological applications of radioisotopes. 2+3+2+7=14
Or
Write short notes on the subsequent (any two): seven x two = 14
(a) Radiocarbon dating
(b) Radiation and mutagenesis
(c) Ionizing radiation

5. Elucidate the nature, impact and treatment to be adapted against sewage pollution. How do
the effluents of industries affects the residing organisms? Add a note on pesticidal toxicity.
(1+2+3)+5+3 =14
Or
Write notes on the following: 3+3+3+5 = 14

(a) Biomagnification and its impact.
(b) Two industrial toxicants- their sources and impacts
(c) Diseases due to environmental hazards
(d) Impact of chemical pollutants on wildlife.

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Earning:   Approval pending.