NEW
Font size
WorksheetsPlant Pathology Mock Exam Q76-Q100
Total questions: 25
Worksheet time: 13mins
Spiral nematodes belong to the genus:
Pratylenchus
Helicotylenchus
Hoplolaimus
Xiphinema
Which nematode also transmits Grapevine fanleaf virus?
Trichodorus
Xiphinema
Meloidogyne
Longidorus
The typical diameter of spherical plant viruses is about:
3 µm
30 nm
1 mm
0.3 nm
Most plant viruses contain:
DNA
RNA
Protein only
Lipids
Plant viruses are transmitted mainly by:
Rainfall
Insect vectors
Soil pH changes
Temperature
A common symptom of viral infection is:
Galls
Mosaic
Blight
Canker
Papaya ringspot is caused by:
Viroid
Fungus
Virus
Bacterium
Coconut cadang-cadang is caused by:
Viroid
Virus
Bacterium
Fungus
Potato spindle tuber disease is caused by:
Virus
Viroid
Fungus
Bacterium
Which method is NOT used to identify viruses?
ELISA
PCR
Gram staining
Electron microscopy
Dodder (Cuscuta sp.) is an example of:
True parasite
Hemi-parasite
Saprophyte
Facultative parasite
Striga (witchweed) is a:
True parasite
Hemi-parasite
Saprophyte
Viroid
Which organ is used by parasitic plants to absorb nutrients?
Haustoria
Stylet
Basidia
Conidiophore
Orobanche (broomrapes) attach to:
Leaves
Roots
Flowers
Fruits
Parasitic flowering plants differ from other pathogens because they:
Lack chlorophyll
Produce flowers and seeds
Can photosynthesize partially
All of the above
Which is NOT a mechanism of fungal variability?
Mutation
Heterokaryosis
Parasexualism
Transformation
Transfer of DNA between bacteria by phages is:
Conjugation
Transformation
Transduction
Hybridization
Cytoplasmic variation in fungi may result from:
Plasmogenes in mitochondria
Mutation of nuclear DNA
Loss of chromosomes
Transformation
Heteroploidy in fungi refers to:
Variation in cell wall structure
Abnormal chromosome number
Loss of flagella
Increase in hyphal septation
Viruses may undergo genetic change by:
Sporulation
Mutation and recombination
Cross-pollination
Conjugation
The stage where inoculum is deposited on the plant surface is:
Penetration
Inoculation
Infection
Colonization
The incubation period is:
Time from sowing to harvest
Time from inoculation to symptom appearance
Time from colonization to survival
Time from germination to sporulation
Diseases with only one cycle per season are:
Monocyclic
Polycyclic
Hyperplastic
Abiotic
The main agents of pathogen dissemination include:
Insects, water, wind, humans
Sunlight and temperature
Nutrients and soil pH
Pesticides and fertilizers
The dormant survival structure of Rhizoctonia is:
Oospore
Sclerotium
Conidium
Basidiospore
