#120.
A group within a pathogen species that infects a set of differential varieties
A
Species
B
Race
C
Pathovar
D
Biovar
Answer: Race
#121.
A virus that infects bacteria
A
Prophage
B
Baculovirus
C
Bacteriophage
D
Macrophage
Answer: Bacteriophage
#122.
The sequence of events that give rise to disease
A
Pathogenesis
B
Disease cycle
C
Saprogenesis
D
Pathogenic cycle
Answer: Pathogenesis
#123.
Stage of pathogenesis that involves the transfer of the inoculum from a source into the infection court
A
Penetration
B
Establishment
C
Infection
D
Inoculation
Answer: Inoculation
#124.
Opening in the epidermis by two specialized epidermal cells
A
Stomates
B
Hydathodes
C
Lenticels
D
Nectaries
Answer: Stomates
#125.
Natural openings in the stem and root surface
A
Stomates
B
Hydathodes
C
Lenticels
D
Nectaries
Answer: Lenticels
#126.
External secretory structure where water from the interior of the leaf is discharged to the leaf surface
A
Stomates
B
Hydathodes
C
Lenticels
D
Nectaries
Answer: Hydathodes
#127.
Extrafloral structures that secrete a sugary liquid
A
Stomates
B
Hydathodes
C
Lenticels
D
Nectaries
Answer: Nectaries
#128.
A microbial product other than an enzyme which causes obvious damage to plant issues, and which is known with reasonable confidence to be involved in disease development
A
Phytoalexin
B
Phytotoxin
C
Cutin
D
Suberin
Answer: Phytotoxin
#129.
Hyperauxiny is the accumulation of unusually high concentrations of
A
Giberillin
B
Cytokinin
C
Indole acetic acid
D
Ethylene
Answer: Indole acetic acid
#130.
Hormone involved in fruit opening
A
Cytokinin
B
Giberillin
C
Ethylene
D
Indole acetic acid
Answer: Ethylene
#131.
Clustering of roots, flowers, fruits or twigs around a common focus
A
Hypertrophy
B
Epinasty
C
Hyperplasia
D
Fasciation
Answer: Fasciation
#132.
A plant overgrowth due to abnormal cell enlargement
A
Hypertrophy
B
Epinasty
C
Hyperplasia
D
Fasciation
Answer: Hypertrophy
#133.
A plant overgrowth due to increased cell division
A
Hypertrophy
B
Epinasty
C
Hyperplasia
D
Fasciation
Answer: Hyperplasia
#134.
Yellowing caused by some factor other than light, such as infection by a virus or a mycoplasma
A
Gummosis
B
Chlorophyllosis
C
Chlorosis
D
Variegation
Answer: Chlorosis
#135.
Caused by hypertrophy and hyperplasia of meristematic and parenchymatous tissues
A
Canker
B
Gall
C
Scab
D
Blight
Answer: Gall
#136.
A general necrosis caused by the rapid growth and advance of the causal bacteria through leaves and stem
A
Witt
B
Blast
C
Blight
D
Rot
Answer: Blight
#137.
Overgrowths of the protoplast of adjacent living parenchymatous cells, which protrude into xylem vessels through pits
A
Gums
B
Tyloses
C
Abscission layers
D
Cork layers
Answer: Tyloses
#138.
The severity of bacterial leaf blight in hybrid rice seed production has been hastened by the clipping of the flag leaf of one of the parents. Why is this so?
A
Clipping produces wounds that serve as bacterial entry points
B
Clipping disrupts physiological processes in the plant
C
Clipping reduces photosynthetic rate
D
All of the above
Answer: Clipping produces wounds that serve as bacterial entry points