Coffee rust is caused by:
A) Uromyces hobsoni
B) Hemileia vastatrix
C) Cronartium ribicola
D) Ravenelia emblicae
Downy mildew of maize is caused by:
A) Peronosclerspora sacchari
B) Peronospora triognella
C) Sclerospora graminicola
D) Sclerospora sacchari
Flag smut of wheat is caused by:
A) Ustilago tritici
B) Urceystis tritici
C) Ustilago hordet
D) Taphrina deformans
In bacterial brown rot and wilt of potato, the amount produced by pathogens is proportional to the severity of symptoms:
A) Gibberellins
B) Lipids
C) Polysaccharide
D) Proteins
Yellow pigment in the culture is produced by:
A) Pseudomonas
B) Xanthomonas
C) Erwinia
D) Agrobacterium
Whittaker (1969) proposed a kingdom system of classification of microorganisms:
A) 4
B) 5
C) 16
D) 18
Cocci are:
A) Spiral shaped
B) Spherical shaped
C) Rod shaped
D) None of the above
Black stem rust of wheat is caused by:
A) Puccinia graminis tritici
B) Puccinia recondita
C) Puccinia striformis
D) Ustilago tritici

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