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Exam No. 27-28 Crop Protection

Total questions: 101

Worksheet time: 51mins

Name
Class
Date
1.

The discovery of DDT on this year is considered as one of the major event in the history of crop protection

a)

1937

b)

1939

c)

1935

d)

1959

2.

Insect mouthpart that is not generally cause damage to plants

a)

piercing sucking

b)

chewing

c)

sponging

d)

siphoning

3.

Which among the following is not a fungi?

a)

Eukaryotic

b)

Algae

c)

Smuts

d)

Mushrooms

4.

This is the outer non-cellular layer covering the nematode body and shed-off during molting

a)

exoskeleton

b)

cuticle

c)

endoskeleton

d)

skin

5.

Which of the following pathogens are generally transmitted by insect vectors?

a)

bacteria

b)

fungi

c)

nematode

d)

virus

6.

A soil that contains a variety of antagonistic microorganisms that produce toxic metabolites against the pathogen and cause pathogen starvation

a)

acidic soil

b)

basic soil

c)

favourable soil

d)

suppressive soil

7.

A broad spectrum gaseous chemical used for management of plant parasitic nematodes that is thought to be damaging to the

a)

Metam-sodium

b)

Carbanate

c)

Methyl bromide

d)

All of the above

8.

A disease caused by a plant viroid

a)

Cadang-cadang disease of coconut

b)

Peanut mottle

c)

Tobacco mosaic

d)

Citrus decline

9.

This is not a method of plant virus diseases diagnoses

a)

Culture of nutrient media

b)

Enzyme-linked immune-sorbent assay

c)

Serology

d)

Use of indicator plants

10.

Toxic antimicrobial substance produced in appreciable amounts in plants only after stimulation by various types of phytopathogens or by chemical or mechanical injury

a)

toxins

b)

elicitors

c)

phytoalexins

d)

antibiotics

11.

The primary reproductive structures of fungi are

a)

Spores

b)

Filaments

c)

Mycelium

d)

Fungus

12.

The Formae specialis is a sub-specific classification of fungi, which is based on

a)

ability to attach different variety of cultivars

b)

cultural characteristics of the fungus

c)

morphological characteristics of the fungus

d)

ability to attach different genera of crop plants

13.

A phenomenon in nematodes when males and females have entirely different morphology

a)

sexual mutation

b)

sexual evolution

c)

sexual dimorphism

d)

sexual diversity

14.

The practice of incorporating fresh plants or plant materials into the soil to control parasitic nematodes

a)

biological control

b)

mulching

c)

organic fertilization

d)

biofumigation

15.

A feeding structure that distinguishes plant parasitic from non-plant parasitic nematodes

a)

denticles

b)

mural tooth

c)

stylet

d)

all of the above

16.

Plant parasitic nematodes are diagnosed by examining

a)

leaves

b)

stems

c)

flower

d)

soil and roots

17.

Author of the “Germ Theory of Disease”

a)

Robert Hooke

b)

H. Robert Koch

c)

Louis Pasteur

d)

Anton de Bary

18.

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

a)

durable resistance

b)

race-specific

c)

hypersensitive response

d)

systematic acquired resistance

19.

A plant disease epidemic would most likely develop in this situation

a)

mature plant

b)

planting multilines or mixture

c)

monoculture

d)

trees in tropical rain forest

20.

Which of the following pests is not arthropod?

a)

golden apple snail

b)

santol gall mite

c)

mango fruitfly

d)

cotton bollworm

21.

Bactrocera dorsalis is a pest of this fruit crop

a)

eggplant

b)

mango

c)

watermelon

d)

tomato

22.

Early harvest is a ______ type of control against pests

a)

cultural control

b)

physical control

c)

chemical control

d)

mechanical control

23.

Which is a major or key pest of mango?

a)

black bug

b)

seedling maggot

c)

leafhopper

d)

brown planthopper

24.

This fungus is present in commercial products BIOCON and BIOACT which parasitizes Radopholus similis, Rotelenchulus reniformis, Meloidogyne spp.

a)

Rhizoctonia solani

b)

Paecilomyces lilacinus

c)

Arthrobotrys oligaspora

d)

Verticillium chlamydosporium

25.

. 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

a)

sanitation

b)

conservation

c)

crop rotation

d)

fallowing

26.

A weed considered as a true-parasite

a)

Portula oleraceae

b)

Plantago major

c)

Cuscuta sp.

d)

Digitaria setigera

27.

This is an example of broad-leaf weed

a)

Imperata cylindrica

b)

Commelina benghalensis

c)

Cyperus rotundus

d)

Leersia hexandra

28.

The ultimate objective of plant pathology is to

a)

survey plant diseases

b)

minimize plant diseases

c)

measure plant diseases

d)

identify plant diseases

29.

Scientific studies in plant pathology began with the invention of

a)

compound microscope

b)

Electron microscope

c)

Lenses

d)

Fungicides

30.

Fungal pathogens that do not produce spores

a)

Oidium and Cladosporium

b)

Fusarium and Helminthosporium

c)

Rhzoctonia and Sclerotum

d)

Colletotrichum and Gloeosporium

31.

The following are botanical insecticides except

a)

Nicotinoids

b)

Pyrethroids

c)

Rotenoids

d)

Juvenoids

32.

This functions as air storage of the insect’s respiratory system

a)

atrium

b)

air sac

c)

valves

d)

taenidium

33.

The relative amount of heritable qualities in plants that influence the ultimate degree of damages by the pest

a)

host plant resistance

b)

tolerance

c)

insecticide resistance

d)

host evation

34.

A toxic substance which is readily available and kills pest instantly

a)

insecticides

b)

rodenticide

c)

pesticides

d)

weedicide

35.

What is the common pattern of nematode spatial distribution in the field?

a)

uniform

b)

patchy

c)

random

d)

cannot be determined

36.

Which life stage of the nematode will not be killed by a systemic nematicide?

a)

females feeding inside the root

b)

eggs

c)

females feeding on the root surface only

d)

seed potato

37.

The plant pathogen present in Collego

a)

Cercospora

b)

Colletotrichum

c)

Curvularia

d)

Helminthisporium

38.

The suspended growth of the embryo is due to propagule

a)

Dormancy

b)

Germination

c)

Respiration

d)

Photosynthesis

39.

The insecticide that kills a wide array of insect species

a)

Specific

b)

Broad spectrum

c)

Narrow spectrum

d)

Aerobic

40.

Which among the following weed species reproduces by seed alone?

a)

Commelina diffusa

b)

Pistia stratiotes

c)

Chromolaena odorata

d)

Synedella nodiflora

41.

One of the following diseases is not due to viroid

a)

Potatoe spindle tube

b)

Tobacco mosaic

c)

Cadang-cadang

d)

Citrus exocortis

42.

A kind of symptom that is distinct and very limited

a)

secondary

b)

general

c)

localized

d)

primary

43.

The setaceous type of antennae is found among

a)

butterflies

b)

dragonflies

c)

grasshoppers

d)

house flies

44.

The elbow-like type of antennae found among ants

a)

geniculate

b)

lamellate

c)

clavate

d)

plumose

45.

Which among the following is sedge?

a)

Bulrush

b)

Beggarstick

c)

little iron weed

d)

dayflower spreading

46.

Itchgrass is the common name of

a)

Echinocloa colona

b)

Eleusine colona

c)

Echinocloa glabrescens

d)

Rottboellia cochninensis

47.

Allelopathic substance are equated to

a)

Allelosomes

b)

Allelochemicals

c)

Mesosomes

d)

Allesomes

48.

The symptom characterized by an extensive necrotic area

a)

lesion

b)

spot

c)

blast

d)

blight

49.

They are pleomorphic microorganisms without cell walls

a)

bacteria

b)

mollicutes

c)

viroids

d)

fungi

50.

The type of metamorphosis for endopterygotes is

a)

holometabola

b)

ametabola

c)

paurometabola

d)

hemimetabola

51.

From which character was the name “arthropoda” derived?

a)

segmentation

b)

antennae

c)

wings

d)

jointed legs

52.

Which statement is not true of all insects?

a)

they have antennae

b)

they have wings

c)

they have three body regions

d)

they have three pairs of legs

53.

Grassy weeds (Poaceae) looks similar to sedges except that their stem called culm is _____

a)

triangular

b)

polyhedral

c)

cylindrical

d)

hexagonal

54.

The hairy membranous outgrowth in between leafs heat and leaf blade in grasses is called

a)

leaf blade

b)

ligueu

c)

petiole

d)

auricle

55.

Which among the following weeds are spread easily by wind?

a)

Echinochloa glabnescens

b)

Tridax procumbens

c)

Mimosa pudica

d)

Sphenoclea zeylanica

56.

Headlice use this type of legs to anchor themselves on the host

a)

grasping

b)

walking

c)

clinging

d)

digging

57.

Broad spectrum fungicides which inhibit mitosis by preventing polymerization of beta tubulin, resistance risk is high.

a)

Triazoles

b)

benzimidazoles

c)

phenylamides

d)

beta-methoxyacrytates

58.

Water-soluble fungicides in powder form that contain inert diluents and wetting agent is classified as

a)

granules

b)

wettable powders

c)

emulsifiable concentrates

d)

dusts

59.

The types of herbicide ( based on the time of application ) that is considered most efficient against weed seedling is ______.

a)

preplant

b)

post-emergence

c)

preemergence

d)

post-directed

60.

The usual means of spread of viruses in the field

a)

fungi

b)

insects

c)

nematodes

d)

bacteria

61.

One of the functions of this agency is to quarantine

a)

UPLB

b)

FPA

c)

BPI

d)

IRRI

62.

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

a)

key

b)

potential

c)

occasional

d)

migrant

63.

The most problematic insect in crucifer plants.

a)

common cutworm

b)

aphids

c)

diamondback moth

d)

cutworm

64.

The forewing is leathery while the hind legs are modified for jumping.

a)

Odonata

b)

Ophemeroptera

c)

Orthoptera

d)

Phasmatodea

65.

These structures are found in grasses except

a)

ligule

b)

node

c)

internode

d)

netted venation

66.

The purple nutsedge is characterized by the

a)

presence node

b)

presence of ligule

c)

hollow stem

d)

presence of tuber

67.

To reduce phytotoxicity, ________ should be added to the fungicide

a)

detergents

b)

starch

c)

oils

d)

calcium carbonate

68.

The type of resistance that plant has if the insect exhibit abnormal development if not immediately killed after feeding.

a)

none preference

b)

tolerance

c)

antibiosis

d)

mechanical basis of resistance

69.

He first discovered viroid as causal agent of plant disease

a)

Theodor Deiner

b)

Y. Doi et al.

c)

A.C Goheen et al.

d)

Berkeley

70.

A group of insecticide that seldom contains carbon

a)

inorganic insecticide

b)

organic insecticide

c)

fluorides

d)

organophosphate

71.

An example of carbamate insecticide is

a)

Dipel

b)

Sherpa

c)

Sabidong

d)

Sevin

72.

This characterize the 2,4-D

a)

non selective preemergence herbicide

b)

non selective contact herbicide

c)

selective post emergence herbicide

d)

non selective systemic herbicide

73.

The most number of weeds belong to the plant family

a)

asteraceae

b)

cyperaceae

c)

poaceae

d)

convulvulaceae

74.

Imbibitions process involves absorption of

a)

oxygen

b)

nitrogen

c)

water

d)

light

75.

Refers to the time from inoculation of the pathogen to the production of visible symptoms

a)

colonization

b)

incubation period

c)

infection

d)

latent period

76.

Aquiscent parasitic relationship which delays symptom expression but which may change into an active one.

a)

latent period

b)

latent infection

c)

incubation period

d)

cross protection

77.

The formulation of this substance became among the foundation of chemical disease control of plant diseases.

a)

fungicide

b)

pesticide

c)

Bordeaux mixture

d)

Benlate

78.

Identify which of the following choice is not an active component manufactured in the basic production of a pesticide

a)

active ingredient

b)

technical material

c)

surfactant

d)

toxicant

79.

Identify which of the following choice is not an active component manufactured in the basic production of a pesticide

a)

active ingredient

b)

technical material

c)

surfactant

d)

toxicant

80.

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.

a)

bar code

b)

manufacture date

c)

color band

d)

pesticide label

81.

It causes bacterial wilt of tomato and other solanaceous crops, banana, and ginger in the Philippines

a)

Xanthomonas oryzae

b)

Agrobacterium tumefaciences

c)

Ralstonia solanacearum

d)

Pectobacterium carotovorum pv carotovum

82.

The breathing organ of insect is

a)

tympanum

b)

circus

c)

ecdysis

d)

spiracles

83.

Efficient plants characterized by the

a)

high light saturation point

b)

absence of chloroplast in the vascular bundle

c)

high water requirement

d)

low light saturation point

84.

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?

a)

Antibiotics

b)

Benzimidazoles

c)

Chloropicrin or tear gas

d)

Carbamates

85.

An example of organochlorine insecticide

a)

Lannate

b)

Chlordane

c)

Malathion

d)

Baygon

86.

In germination, the period of rapid metabolic activity is best characterized by

a)

faster rate of reproduction

b)

faster cell division and elongation

c)

faster photosynthetic activity

d)

faster rate of senescence

87.

Type of formation in which the active material is readily dissolve in water but not in organic solvents

a)

aqueous concentrates

b)

emulsifiable concentrates

c)

flowables

d)

water soluble powders

88.

It causes common bacteria soft not of vegetable in the Philippines

a)

Agrobacterium tumefaciences

b)

Xanthomanas oryzae

c)

Pectobacterium carotovorum pv carotovum

d)

Ralstonia solanacearum

89.

These pathogens are known to cause the cadang-cadang of coconut

a)

bacteria

b)

spiroplasma

c)

viroids

d)

mycoplasma

90.

This part of the digestive system functions as center of absorption in absorbing nutrients in the hemocoele

a)

crop

b)

anus

c)

mouth

d)

malpigian tubules

91.

Some pesticide are seldom formulated as dusts because of this problem

a)

cost per gram

b)

high toxicity

c)

respiratory problems

d)

drift problem

92.

Which of the following insect order is wingless

a)

Lepidoptera

b)

Isopteran

c)

Anoplura

d)

Coleopteran

93.

Which of the following insect species is common used in genetics studies

a)

Chiconomoides sp.

b)

Arabidopsis thaliana

c)

Drosophila melanogaster

d)

Agrobacterium tumefaciens

94.

The threadlike vegetative fungal structure

a)

Ooze

b)

Scierotium

c)

Exudates

d)

Mycelium

95.

Which is not a distinct characteristic of Class Loculoascomycetes of fungi

a)

Ascocarp in ascostroma

b)

Asci in locules

c)

Monolocular ascostroma

d)

A single-walled ascus

96.

It causes crown gall and is used in genetic engineering of plants

a)

Xanthomonas oryzae

b)

Agrobacterium tumefaciens

c)

Ralstonia solanacearum

d)

Pectobacterium carotovorum

97.

Refers to the control of pests by living organisms under either natural or artificial environment

a)

cultural control

b)

behaviour

c)

biological control

d)

autocidal control

98.

Legal actions intended to exclude potential pests and to prevent spread of those already present

a)

eradication

b)

suppression

c)

containment

d)

quarantine

99.

Cockroaches belong to this insect order

a)

Ortho

b)

Mantodea

c)

Phasmatodea

d)

Blatodia

100.

This wing type belongs to Orthopterans

a)

membranous

b)

hemelytron

c)

elytron

d)

tegmen

101.

The majority of plant disease are caused by

a)

viruses

b)

fungi

c)

bacteria

d)

nematodes