WorksheetsExam No. 27-28 Crop Protection
Total questions: 101
Worksheet time: 51mins
The discovery of DDT on this year is considered as one of the major event in the history of crop protection
1937
1939
1935
1959
Insect mouthpart that is not generally cause damage to plants
piercing sucking
chewing
sponging
siphoning
Which among the following is not a fungi?
Eukaryotic
Algae
Smuts
Mushrooms
This is the outer non-cellular layer covering the nematode body and shed-off during molting
exoskeleton
cuticle
endoskeleton
skin
Which of the following pathogens are generally transmitted by insect vectors?
bacteria
fungi
nematode
virus
A soil that contains a variety of antagonistic microorganisms that produce toxic metabolites against the pathogen and cause pathogen starvation
acidic soil
basic soil
favourable soil
suppressive soil
A broad spectrum gaseous chemical used for management of plant parasitic nematodes that is thought to be damaging to the
Metam-sodium
Carbanate
Methyl bromide
All of the above
A disease caused by a plant viroid
Cadang-cadang disease of coconut
Peanut mottle
Tobacco mosaic
Citrus decline
This is not a method of plant virus diseases diagnoses
Culture of nutrient media
Enzyme-linked immune-sorbent assay
Serology
Use of indicator plants
Toxic antimicrobial substance produced in appreciable amounts in plants only after stimulation by various types of phytopathogens or by chemical or mechanical injury
toxins
elicitors
phytoalexins
antibiotics
The primary reproductive structures of fungi are
Spores
Filaments
Mycelium
Fungus
The Formae specialis is a sub-specific classification of fungi, which is based on
ability to attach different variety of cultivars
cultural characteristics of the fungus
morphological characteristics of the fungus
ability to attach different genera of crop plants
A phenomenon in nematodes when males and females have entirely different morphology
sexual mutation
sexual evolution
sexual dimorphism
sexual diversity
The practice of incorporating fresh plants or plant materials into the soil to control parasitic nematodes
biological control
mulching
organic fertilization
biofumigation
A feeding structure that distinguishes plant parasitic from non-plant parasitic nematodes
denticles
mural tooth
stylet
all of the above
Plant parasitic nematodes are diagnosed by examining
leaves
stems
flower
soil and roots
Author of the “Germ Theory of Disease”
Robert Hooke
H. Robert Koch
Louis Pasteur
Anton de Bary
A non-specific or generalized resistance that spreads systemically and develop in distal untreated parts of the plant after the plant has been challenged by the pathogen
durable resistance
race-specific
hypersensitive response
systematic acquired resistance
A plant disease epidemic would most likely develop in this situation
mature plant
planting multilines or mixture
monoculture
trees in tropical rain forest
Which of the following pests is not arthropod?
golden apple snail
santol gall mite
mango fruitfly
cotton bollworm
Bactrocera dorsalis is a pest of this fruit crop
eggplant
mango
watermelon
tomato
Early harvest is a ______ type of control against pests
cultural control
physical control
chemical control
mechanical control
Which is a major or key pest of mango?
black bug
seedling maggot
leafhopper
brown planthopper
This fungus is present in commercial products BIOCON and BIOACT which parasitizes Radopholus similis, Rotelenchulus reniformis, Meloidogyne spp.
Rhizoctonia solani
Paecilomyces lilacinus
Arthrobotrys oligaspora
Verticillium chlamydosporium
. When the field is left unplanted for a certain period, the population of nematodes decrease because they are deprived of their plant hosts. This practice which also allows soil rejuvenation is called
sanitation
conservation
crop rotation
fallowing
A weed considered as a true-parasite
Portula oleraceae
Plantago major
Cuscuta sp.
Digitaria setigera
This is an example of broad-leaf weed
Imperata cylindrica
Commelina benghalensis
Cyperus rotundus
Leersia hexandra
The ultimate objective of plant pathology is to
survey plant diseases
minimize plant diseases
measure plant diseases
identify plant diseases
Scientific studies in plant pathology began with the invention of
compound microscope
Electron microscope
Lenses
Fungicides
Fungal pathogens that do not produce spores
Oidium and Cladosporium
Fusarium and Helminthosporium
Rhzoctonia and Sclerotum
Colletotrichum and Gloeosporium
The following are botanical insecticides except
Nicotinoids
Pyrethroids
Rotenoids
Juvenoids
This functions as air storage of the insect’s respiratory system
atrium
air sac
valves
taenidium
The relative amount of heritable qualities in plants that influence the ultimate degree of damages by the pest
host plant resistance
tolerance
insecticide resistance
host evation
A toxic substance which is readily available and kills pest instantly
insecticides
rodenticide
pesticides
weedicide
What is the common pattern of nematode spatial distribution in the field?
uniform
patchy
random
cannot be determined
Which life stage of the nematode will not be killed by a systemic nematicide?
females feeding inside the root
eggs
females feeding on the root surface only
seed potato
The plant pathogen present in Collego
Cercospora
Colletotrichum
Curvularia
Helminthisporium
The suspended growth of the embryo is due to propagule
Dormancy
Germination
Respiration
Photosynthesis
The insecticide that kills a wide array of insect species
Specific
Broad spectrum
Narrow spectrum
Aerobic
Which among the following weed species reproduces by seed alone?
Commelina diffusa
Pistia stratiotes
Chromolaena odorata
Synedella nodiflora
One of the following diseases is not due to viroid
Potatoe spindle tube
Tobacco mosaic
Cadang-cadang
Citrus exocortis
A kind of symptom that is distinct and very limited
secondary
general
localized
primary
The setaceous type of antennae is found among
butterflies
dragonflies
grasshoppers
house flies
The elbow-like type of antennae found among ants
geniculate
lamellate
clavate
plumose
Which among the following is sedge?
Bulrush
Beggarstick
little iron weed
dayflower spreading
Itchgrass is the common name of
Echinocloa colona
Eleusine colona
Echinocloa glabrescens
Rottboellia cochninensis
Allelopathic substance are equated to
Allelosomes
Allelochemicals
Mesosomes
Allesomes
The symptom characterized by an extensive necrotic area
lesion
spot
blast
blight
They are pleomorphic microorganisms without cell walls
bacteria
mollicutes
viroids
fungi
The type of metamorphosis for endopterygotes is
holometabola
ametabola
paurometabola
hemimetabola
From which character was the name “arthropoda” derived?
segmentation
antennae
wings
jointed legs
Which statement is not true of all insects?
they have antennae
they have wings
they have three body regions
they have three pairs of legs
Grassy weeds (Poaceae) looks similar to sedges except that their stem called culm is _____
triangular
polyhedral
cylindrical
hexagonal
The hairy membranous outgrowth in between leafs heat and leaf blade in grasses is called
leaf blade
ligueu
petiole
auricle
Which among the following weeds are spread easily by wind?
Echinochloa glabnescens
Tridax procumbens
Mimosa pudica
Sphenoclea zeylanica
Headlice use this type of legs to anchor themselves on the host
grasping
walking
clinging
digging
Broad spectrum fungicides which inhibit mitosis by preventing polymerization of beta tubulin, resistance risk is high.
Triazoles
benzimidazoles
phenylamides
beta-methoxyacrytates
Water-soluble fungicides in powder form that contain inert diluents and wetting agent is classified as
granules
wettable powders
emulsifiable concentrates
dusts
The types of herbicide ( based on the time of application ) that is considered most efficient against weed seedling is ______.
preplant
post-emergence
preemergence
post-directed
The usual means of spread of viruses in the field
fungi
insects
nematodes
bacteria
One of the functions of this agency is to quarantine
UPLB
FPA
BPI
IRRI
A category of pest cause no significant damage under the conditions currently prevailing, however, this can be a key or occasional pest if conditions in the field are disrupted
key
potential
occasional
migrant
The most problematic insect in crucifer plants.
common cutworm
aphids
diamondback moth
cutworm
The forewing is leathery while the hind legs are modified for jumping.
Odonata
Ophemeroptera
Orthoptera
Phasmatodea
These structures are found in grasses except
ligule
node
internode
netted venation
The purple nutsedge is characterized by the
presence node
presence of ligule
hollow stem
presence of tuber
To reduce phytotoxicity, ________ should be added to the fungicide
detergents
starch
oils
calcium carbonate
The type of resistance that plant has if the insect exhibit abnormal development if not immediately killed after feeding.
none preference
tolerance
antibiosis
mechanical basis of resistance
He first discovered viroid as causal agent of plant disease
Theodor Deiner
Y. Doi et al.
A.C Goheen et al.
Berkeley
A group of insecticide that seldom contains carbon
inorganic insecticide
organic insecticide
fluorides
organophosphate
An example of carbamate insecticide is
Dipel
Sherpa
Sabidong
Sevin
This characterize the 2,4-D
non selective preemergence herbicide
non selective contact herbicide
selective post emergence herbicide
non selective systemic herbicide
The most number of weeds belong to the plant family
asteraceae
cyperaceae
poaceae
convulvulaceae
Imbibitions process involves absorption of
oxygen
nitrogen
water
light
Refers to the time from inoculation of the pathogen to the production of visible symptoms
colonization
incubation period
infection
latent period
Aquiscent parasitic relationship which delays symptom expression but which may change into an active one.
latent period
latent infection
incubation period
cross protection
The formulation of this substance became among the foundation of chemical disease control of plant diseases.
fungicide
pesticide
Bordeaux mixture
Benlate
Identify which of the following choice is not an active component manufactured in the basic production of a pesticide
active ingredient
technical material
surfactant
toxicant
Identify which of the following choice is not an active component manufactured in the basic production of a pesticide
active ingredient
technical material
surfactant
toxicant
In pesticide preparation, this is the written material or graphic design printed on the container of the pesticide. This is considered a legal document which requires a government approval.
bar code
manufacture date
color band
pesticide label
It causes bacterial wilt of tomato and other solanaceous crops, banana, and ginger in the Philippines
Xanthomonas oryzae
Agrobacterium tumefaciences
Ralstonia solanacearum
Pectobacterium carotovorum pv carotovum
The breathing organ of insect is
tympanum
circus
ecdysis
spiracles
Efficient plants characterized by the
high light saturation point
absence of chloroplast in the vascular bundle
high water requirement
low light saturation point
Which of the following is a broad-spectrum chemical pesticide, which can be used for soil fumigation to kill insects, fungi and nematodes in the soil?
Antibiotics
Benzimidazoles
Chloropicrin or tear gas
Carbamates
An example of organochlorine insecticide
Lannate
Chlordane
Malathion
Baygon
In germination, the period of rapid metabolic activity is best characterized by
faster rate of reproduction
faster cell division and elongation
faster photosynthetic activity
faster rate of senescence
Type of formation in which the active material is readily dissolve in water but not in organic solvents
aqueous concentrates
emulsifiable concentrates
flowables
water soluble powders
It causes common bacteria soft not of vegetable in the Philippines
Agrobacterium tumefaciences
Xanthomanas oryzae
Pectobacterium carotovorum pv carotovum
Ralstonia solanacearum
These pathogens are known to cause the cadang-cadang of coconut
bacteria
spiroplasma
viroids
mycoplasma
This part of the digestive system functions as center of absorption in absorbing nutrients in the hemocoele
crop
anus
mouth
malpigian tubules
Some pesticide are seldom formulated as dusts because of this problem
cost per gram
high toxicity
respiratory problems
drift problem
Which of the following insect order is wingless
Lepidoptera
Isopteran
Anoplura
Coleopteran
Which of the following insect species is common used in genetics studies
Chiconomoides sp.
Arabidopsis thaliana
Drosophila melanogaster
Agrobacterium tumefaciens
The threadlike vegetative fungal structure
Ooze
Scierotium
Exudates
Mycelium
Which is not a distinct characteristic of Class Loculoascomycetes of fungi
Ascocarp in ascostroma
Asci in locules
Monolocular ascostroma
A single-walled ascus
It causes crown gall and is used in genetic engineering of plants
Xanthomonas oryzae
Agrobacterium tumefaciens
Ralstonia solanacearum
Pectobacterium carotovorum
Refers to the control of pests by living organisms under either natural or artificial environment
cultural control
behaviour
biological control
autocidal control
Legal actions intended to exclude potential pests and to prevent spread of those already present
eradication
suppression
containment
quarantine
Cockroaches belong to this insect order
Ortho
Mantodea
Phasmatodea
Blatodia
This wing type belongs to Orthopterans
membranous
hemelytron
elytron
tegmen
The majority of plant disease are caused by
viruses
fungi
bacteria
nematodes
