Dibrugarh University| B.SC - (CBCS)| BOTANY - (C - 3)| Question Paper - (June/ July) - 2022| 2nd Semester
2022
(June/July)
BOTANY
(Core)
Paper: C-3
(Mycology and Phytopathology)
Full Marks: 53
Pass Marks: 21
Time: 3 hours
The figures in the margin indicate
full marks for the questions
1. (a) Choose and write the correct answer of the following: 1x3=3
(i) Peziza /
Puccinia / Agaricus is a polymorphic fungi.
(ii) In case of
diseased plants, small spots or streaks of dead tissue appear. The phenomenon
is referred as moulting / necrosis / chlorosis / distortion.
(iii) Citrus
canker is a viral / fungal / bacterial / algal disease.
(b) Fill in
the blanks of the following: 1x2=2
(i) The cell
wall of fungi is mostly made up of
(ii) Early
blight of potato is caused by
2. Write short notes on any three of the following:
4x3=12
(a)
Heterothallism in Rhizopus
(b) Role of
fungi in agriculture
(c) Conidia of
Alternaria
(d) Fungal
toxins
(e) Sexuality in
fungi
3. What are heteroecious fungi? With suitable diagram,
describe the life cycle of Puccinia. 1+4+7=12
Or
What are allied
fungi? Mention the characters of slime moulds. Describe the life-cycle of
typical cellular slime mould. 1+4+7=12
4. Name the algal and fungal components of lichen. Describe
the different growth forms of lichen. Draw and describe the internal structure
of homomerous and heteromerous lichen. 1+5+6=12
Or
Write about the
role of fungi in food industry. How are fungi used as biofertilizers? Give
examples. 6+4+2=12
5. Mention the symptoms, names of the causal organism,
disease cycle and control measures of the diseases (any two): (1+1+2+2)×2=12
(a) Black stem
rust of wheat
(b) Yellow vein
clearing of bhindi
(c) Angular leaf
spot of cotton
(d) White rust
of crucifers
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