#220.
In some genera of plant parasitic nematodes like Meloidogyne, Globodera, Heterodera, etc., males and females have entirely different morphology. How is this phenomenon called?
A
sexual degeneration
B
sexual mutation
C
sexual diversity
D
sexual dimorphism
Answer: sexual dimorphism
#221.
If juveniles and adults are motile and outside of roots during all life cycle stages a plant parasitic nematode is a/an
A
migratory ectoparasite
B
direct parasite
C
indirect parasite
D
migratory endoparasite
Answer: migratory ectoparasite
#222.
If juveniles and adults are motile during all life cycle stages but may be either within or inside of roots a plant parasitic nematode is a/an
A
migratory ectoparasite
B
migratory endoparasite
C
direct parasite
D
indirect parasite
Answer: migratory endoparasite
#223.
If an infective stage juvenile enters a root, takes up a feeding site and remains at that site a plant parasitic nematode is a/an
A
direct parasite
B
sedentary endoparasite
C
sedentary ectoparasite
D
indirect parasite
Answer: sedentary endoparasite
#224.
Education, quarantine, using certified planting materials, checking suspect materials before planting, and cleaning equipment, are examples of what type of management of plant parasitic nematodes
A
prevention
B
protection
C
eradication
D
immunization
Answer: prevention
#225.
Crop rotation, using resistant varieties, fallowing, using cover crops, and varying the date of planting and harvest are examples of what type of management of plant parasitic nematodes
A
biological
B
cultural
C
physical
D
chemical
Answer: cultural
#226.
The most widely used category of chemicals for management of plant parasitic nematodes has traditionally been
A
mebendazoles
B
carbamates
C
fumigants
D
natural products
Answer: fumigants
#227.
A broad-spectrum gaseous chemical used for management of plant parasitic nematodes that is thought to be damaging to the ozone layer is
A
metam-sodium
B
carbamate
C
methyl bromide
D
all of the above
Answer: methyl bromide
#228.
The practice of incorporating fresh plants or plant materíals onto the soil as a mean to control plant parasitic nematodes is called
A
biological control
B
biofumigation
C
fallowing
D
organic fertilization
Answer: biofumigation
#229.
What is the main compound present in some species of Tagetes that repels and/ or suppress certain plant parasitic nematodes?
A
alpha tertienyl
B
beta-ocimene
C
isothiocyanate
D
all of the above
Answer: alpha tertienyl
#230.
What is the practice of leaving the farm unplanted for certain period, thus, depriving the nematodes of their hosts which brings their population into a significantly low level?
A
crop rotation
B
sanitation
C
solarization
D
fallowing
Answer: fallowing
#231.
The following except for one are responsible for nematode control by incorporating fresh chicken dung into infested soils.
A
It harbors lots of microorganisms that may be parasitic to nematodes
B
It generates heat during decomposition
C
It increases soil fertility
D
It imparts toxic compounds
Answer: It increases soil fertility
#232.
In the Philippines, BIOACT and BIOCON are commercial products of a fungus that parasitizes Maloidogyne spp., Radopholus similis, Rotylenchulus reniformis, etc. What is that fungus?
A
Paecilomyces lilacinus
B
Verticillium chlamydosporium
C
Arthrobotrys oligospora
D
Rhizoctonia solani
Answer: Paecilomyces lilacinus
#233.
What is the common pattern of nematode spatial distribution in a field?
A
Uniform
B
Random
C
patchy
D
none of the above
Answer: patchy
#234.
Which of the following facilitates long-distance spread of nematodes?
A
water
B
drainage
C
infected seeds/ bulbs/ corms
D
soil particles adhering on farm equipment
Answer: infected seeds/ bulbs/ corms
#235.
In what order does the most of the important genera of plant parasitic nematodes belong?
A
Triplonchida
B
Dorylaimida
C
Tylenchida
D
Aphelenchida
Answer: Tylenchida
#236.
What is the most preferred site for root penetration of infective stage of Meloidogyne spp.?
A
root cap
B
zone of elongation
C
zone of differentiation
D
zone of maturation
Answer: zone of elongation
#237.
What soil texture is generally most preferred by plant parasitic nematodes?
A
silty
B
muddy
C
sandy
D
clayey
Answer: sandy
#238.
Which life stage of the nematode will NOT be killed by a systemic nematicide?
A
eggs
B
juveniles
C
females feeding inside the roots
D
Females feeding on the root surface
Answer: eggs
#239.
Hot water treatment is a very practical method of controlling nematodes that are possibly harbored by planting materials, thus preventing their introduction to a new locality. The following planting materials can be subjected to this procedure EXCEPT for