PCA Insects V3 Questions and Correct Answers with
Complete Solution | New Update 2026/27 | Graded A+
Pheromone mating disruption is used in management programs in California to
control? - ANSWERS codling moth
How do piercing sucking mouthparts differ from other types of mouthparts? -
ANSWERS mandible and maxillae are modified into stylets
Which type of insect is most often killed when it feeds on plants treated with
pesticides? - ANSWERS leafhoppers
Transgenic plants for control of arthropod pests have been developed? -
ANSWERS Bacillus thuringiensis
As originally devised, the main objective of the sterile insect technique is? -
ANSWERS eradication
Which insect mortality factor is sometimes density-dependent? - ANSWERS
action of natural enemies
Which of these insects is an example of a predator? - ANSWERS ichneumon
wasp
,Most adult slugs and snails feed on which of these? - ANSWERS both living
and dead plant matter
Which of these outcomes can be reduced by harvesting alfalfa hay a few days
early? - ANSWERS presence of virus vectoring aphids
Stippling is most common with insects that have? - ANSWERS piercing sucking
mouthparts
An insects exoskeleton protects it against? - ANSWERS desiccation
The body regions of a spider include the? - ANSWERS abdomen and
cephalothorax
Which statement best describes the difference between wing development in
nymphs and larvae? - ANSWERS wings develop outside the body of nymphs
while inside the body of larvae
Which environment is most limiting when natural enemies are being introduced? -
ANSWERS annual row crops
Larvae of which pest penetrate into apples and pears, tunneling to the Core and
leaving holes filled with reddish brown, crumbly frass? - ANSWERS codling
moth
The feeding damage and webbing on these apricots was most likely caused by? -
ANSWERS European earwig
,Reproduction in the absence of male gamete is called? - ANSWERS
parthenogenesis
In what way do parasitoids differ from predators? - ANSWERS Parasitoids live
on or within their hosts while immature, and predators are always free living
The control of Cottony cushion scale by the vedalia beetle is an example of which
type of control? - ANSWERS Classical Biological Control
Which insect undergoes complete metamorphosis? - ANSWERS Butterflies,
flies, beetles, bees, wasps, ants, and fleas
What insects can reproduce asexually? - ANSWERS Stick insects
(Phasmatodea), Soybean aphids, water fleas (Daphnia sp.), and nematodes
Which of these pests has gradual metamorphosis? - ANSWERS termites
During which stage are plants least able to compensate for injury caused by insect
pests? - ANSWERS when fruit is forming
What group of arthropods is often controlled with baits? - ANSWERS slugs
Why does the development rate of insects increase when the temperature
increases within their species-specific threshold? - ANSWERS chemical
reaction occur more frequently and proceed more rapidly at higher temperatures
, Which of these techniques can be used to minimize secondary pest outbreaks? -
ANSWERS applying a selective insecticide
Which application technique conserves natural enemies most effectively? -
ANSWERS spot treatments
When might a cotton grower expect a major influx of lygus bugs into his crops? -
ANSWERS after harvesting Alfalfa in nearby fields
Which statement describes the challenge of sampling insects that are clumped in
a field? - ANSWERS absolute sampling is the only method of determining
population densities
When dense populations of an insect species are found only in a few areas of a
field, their population distribution is best described as? - ANSWERS clumped
Which of these characteristics makes an insecticide most likely to enter surface
drinking water supplies? - ANSWERS persistence
Which statement describes a distinguishing characteristic of lygus bugs? -
ANSWERS Immatures are pale green and have five black spots
Which component of a beetles mouthparts enables it to bite off and chew pieces?
- ANSWERS mandible
Complete Solution | New Update 2026/27 | Graded A+
Pheromone mating disruption is used in management programs in California to
control? - ANSWERS codling moth
How do piercing sucking mouthparts differ from other types of mouthparts? -
ANSWERS mandible and maxillae are modified into stylets
Which type of insect is most often killed when it feeds on plants treated with
pesticides? - ANSWERS leafhoppers
Transgenic plants for control of arthropod pests have been developed? -
ANSWERS Bacillus thuringiensis
As originally devised, the main objective of the sterile insect technique is? -
ANSWERS eradication
Which insect mortality factor is sometimes density-dependent? - ANSWERS
action of natural enemies
Which of these insects is an example of a predator? - ANSWERS ichneumon
wasp
,Most adult slugs and snails feed on which of these? - ANSWERS both living
and dead plant matter
Which of these outcomes can be reduced by harvesting alfalfa hay a few days
early? - ANSWERS presence of virus vectoring aphids
Stippling is most common with insects that have? - ANSWERS piercing sucking
mouthparts
An insects exoskeleton protects it against? - ANSWERS desiccation
The body regions of a spider include the? - ANSWERS abdomen and
cephalothorax
Which statement best describes the difference between wing development in
nymphs and larvae? - ANSWERS wings develop outside the body of nymphs
while inside the body of larvae
Which environment is most limiting when natural enemies are being introduced? -
ANSWERS annual row crops
Larvae of which pest penetrate into apples and pears, tunneling to the Core and
leaving holes filled with reddish brown, crumbly frass? - ANSWERS codling
moth
The feeding damage and webbing on these apricots was most likely caused by? -
ANSWERS European earwig
,Reproduction in the absence of male gamete is called? - ANSWERS
parthenogenesis
In what way do parasitoids differ from predators? - ANSWERS Parasitoids live
on or within their hosts while immature, and predators are always free living
The control of Cottony cushion scale by the vedalia beetle is an example of which
type of control? - ANSWERS Classical Biological Control
Which insect undergoes complete metamorphosis? - ANSWERS Butterflies,
flies, beetles, bees, wasps, ants, and fleas
What insects can reproduce asexually? - ANSWERS Stick insects
(Phasmatodea), Soybean aphids, water fleas (Daphnia sp.), and nematodes
Which of these pests has gradual metamorphosis? - ANSWERS termites
During which stage are plants least able to compensate for injury caused by insect
pests? - ANSWERS when fruit is forming
What group of arthropods is often controlled with baits? - ANSWERS slugs
Why does the development rate of insects increase when the temperature
increases within their species-specific threshold? - ANSWERS chemical
reaction occur more frequently and proceed more rapidly at higher temperatures
, Which of these techniques can be used to minimize secondary pest outbreaks? -
ANSWERS applying a selective insecticide
Which application technique conserves natural enemies most effectively? -
ANSWERS spot treatments
When might a cotton grower expect a major influx of lygus bugs into his crops? -
ANSWERS after harvesting Alfalfa in nearby fields
Which statement describes the challenge of sampling insects that are clumped in
a field? - ANSWERS absolute sampling is the only method of determining
population densities
When dense populations of an insect species are found only in a few areas of a
field, their population distribution is best described as? - ANSWERS clumped
Which of these characteristics makes an insecticide most likely to enter surface
drinking water supplies? - ANSWERS persistence
Which statement describes a distinguishing characteristic of lygus bugs? -
ANSWERS Immatures are pale green and have five black spots
Which component of a beetles mouthparts enables it to bite off and chew pieces?
- ANSWERS mandible
