BOT/IV/04 Student's Copy
2 0 1 8
Pre-CBCS
4th Semester
BOTANY
FOURTH PAPER
Microbiology, Cytology, Genetics and Evolution
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. 9+2 fibrillar arrangement is present in
eukaryotic flagella
bacterial flagella
bacterial fimbriae
T4 bacteriophage
2. The microbial reduction of nitrate and nitrite with the liberation of
molecular nitrogen and nitrous oxide is called
nitrification
ammonification
denitrification
All of the above
/411 1 Contd.
3. Which one of the following is the richest source of enzyme invertase?
Rhizopus
Aspergillus niger
Pseudomonas
Saccharomyces cerevisiae
4. Chiasma formation is the characteristic of
DNA replication
linkage
crossing-over
DNA recombination
5. In the F2, a phenotypic ratio is 12 3 is obtained due to interaction of
genes called
epistatic genes
duplicate genes
complimentary genes
lethal genes
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Scope of microbiology
2. Plasmid
3. Endophytic nitrogen fixers
4. Incomplete dominance
5. Complete and incomplete linkages
BOT/IV/04/411 2 Contd.
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. Describe the structure of bacterial cell with a neat labelled diagram. 7
OR
Write notes on the following 3½×2=7
Microbial production of fermented food
Conjugation in bacteria
2. Define antibiotics. Describe the role of microorganisms in the production of
antibiotics.
OR
Write notes on the following 3½×2=7
Role of microbes in carbon cycle
Microbial production of alcoholic beverages
3. Define cytoskeleton. Write a note on cytoskeleton with an example.
OR
Write short notes on the following 3½×2=7
Heterochromatin
Duplicate genes
BOT/IV/04/411 3 Contd.
4. Describe the cytological basis of crossing-over with illustration. 7
OR
Write short notes on the following 3½×2=7
Chromosome theory of sex determination
Linkage map
5. What do you understand by organic evolution? Give a brief account of
Lamarck's theory of evolution.
OR
Write notes on the following 3½×2=7
Demerits of Darwinism
Acquired characters