BOT/V/05 Student's Copy
2 0 1 8
Pre-CBCS
5th Semester
BOTANY
FIFTH PAPER
Fungi, Plant Pathology and Biostatistics
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. The most common cell wall material in fungi is
cellulose
pectin
chitin
lignin
/325 1 Contd.
2. The penicillin drug was invented by
Louis Pasteur
Alexander Fleming
Ainsworth
C. J. Alexopoulos
3. The branched structures which penetrate in the host tissue and have
absorptive function are called
haustoria
appressorium
hyphae
hyphopodia
4. Alternaria solani the causal organism for early blight of potato belongs to a
class
Deuteromycotina
Zygomycotina
Ascomycotina
Basidiomycotina
5. An integer used to determine whether a chi-square value is statistically
significant is called
t-test
degrees of freedom
median
standard deviation
BOT/V/05/325 2 Contd.
SECTION—B
Marks 15
Write brief notes on the following 3×5=15
1. Passive liberation of fungal spores
2. Importance of fungi as food
3. Physical defense mechanism before infection
4. Symptoms of powdery mildews of crucifers
5. Standard deviation
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. Classify fungi up to classes according to Ainsworth system of classification
by giving their salient features. 7
OR
Write notes on any two of the following 3½×2=7
Basidiomycotina
Types of fungal spores
Salient features of fungi
2. Describe the role of fungi in agriculture and medicine. 7
OR
Write notes on any two of the following 3½×2=7
Parasexuality in fungi
Heterothallism in fungi
Saprophytic mode of nutrition in fungi
BOT/V/05/325 3 Contd.
3. Discuss the different modes of spread of pathogens. 7
OR
Write notes on any two of the following 3½×2=7
Chemical defense mechanism in plants
Scope of plant pathology
Biological control of plant disease
4. Describe the symptoms, causal organism and disease cycle of late blight of
potato. 7
OR
Write notes on any two of the following 3½×2=7
Citrus canker
Disease cycle of downy mildew of crucifers
Symptoms and control measures of smuts of wheat
5. What do you mean by arithmetic mean? Calculate the arithmetic mean for
the following grouped data
Class interval 10-20 20-30 30-40 40-50 50-60 60-70
Frequency 3 5 10 15 5 12
OR
Write notes on any two of the following 3½×2=7
Median
Standard error
Chi-square test