PCA Insects Test Questions and
Correct Answers Latest Version Top
Rated A+
QUESTION 1
The “Tsetse fly” primarily transmits:
A. Trypanosomiasis (sleeping sickness)
B. Malaria
C. Filariasis
D. Dengue fever
ANSWER A
RATIONALE: Glossina spp. transmit Trypanosoma brucei, the causative
agent of sleeping sickness in humans.
QUESTION 2
The larval stage of Lepidoptera is commonly referred to as:
A. Maggot
B. Caterpillar
C. Grub
D. Nymph
ANSWER B
RATIONALE: Lepidopteran larvae are caterpillars, which later pupate into
moths or butterflies. Maggots are dipteran larvae, grubs are coleopteran
larvae, and nymphs belong to incomplete metamorphosis stages.
QUESTION 3
Which of the following best describes complete metamorphosis?
A. Egg → Nymph → Adult
B. Egg → Larva → Pupa → Adult
C. Egg → Larva → Adult
D. Egg → Nymph → Pupa → Adult
,ANSWER B
RATIONALE: Complete metamorphosis, or holometabolism, involves four
distinct life stages: egg, larva, pupa, and adult. This process allows for
distinct ecological roles and reduced competition between stages.
QUESTION 4
The family Aphididae is best known for which type of feeding habit?
A. Chewing leaves
B. Piercing and sucking plant sap
C. Predatory on other insects
D. Scavenging
ANSWER B
RATIONALE: Aphids (Aphididae) are sap-sucking insects that use their
stylets to extract phloem fluids, often transmitting plant viruses as they
feed.
QUESTION 5
Which of the following insects is a known biological control agent for
aphids?
A. Colorado potato beetle
B. Lady beetle (Coccinellidae)
C. Corn rootworm
D. Whitefly
ANSWER B
RATIONALE: Lady beetles (commonly called ladybugs) are avid predators
of aphids, whiteflies, and soft-bodied pests, serving as beneficial natural
enemies in integrated pest management.
QUESTION 6
The term “entomology” refers to:
A. The study of ecosystems
B. The study of insects
C. The study of microbial life
D. The study of mammals
ANSWER B
, RATIONALE: Entomology derives from the Greek word “entomon”
meaning insect and “logia” meaning study, thus it is the scientific study of
insects.
QUESTION 7
Which insect order includes species that are important pollinators and
also social insects?
A. Diptera
B. Orthoptera
C. Hymenoptera
D. Thysanoptera
ANSWER C
RATIONALE: The order Hymenoptera includes bees, ants, and wasps—
many of which are critical pollinators and exhibit complex social behavior.
QUESTION 8
Insect exoskeletons are primarily composed of:
A. Cellulose
B. Chitin
C. Keratin
D. Pectin
ANSWER B
RATIONALE: Chitin is a complex polysaccharide forming the structural
component of the insect exoskeleton, providing strength and flexibility.
QUESTION 9
What is the primary function of insect halteres?
A. Sound production
B. Sensory reception
C. Stabilization during flight
D. Food storage
ANSWER C
RATIONALE: Halteres, found in flies (Diptera), are modified hindwings that
act as gyroscopic organs for balance and flight stability.
Correct Answers Latest Version Top
Rated A+
QUESTION 1
The “Tsetse fly” primarily transmits:
A. Trypanosomiasis (sleeping sickness)
B. Malaria
C. Filariasis
D. Dengue fever
ANSWER A
RATIONALE: Glossina spp. transmit Trypanosoma brucei, the causative
agent of sleeping sickness in humans.
QUESTION 2
The larval stage of Lepidoptera is commonly referred to as:
A. Maggot
B. Caterpillar
C. Grub
D. Nymph
ANSWER B
RATIONALE: Lepidopteran larvae are caterpillars, which later pupate into
moths or butterflies. Maggots are dipteran larvae, grubs are coleopteran
larvae, and nymphs belong to incomplete metamorphosis stages.
QUESTION 3
Which of the following best describes complete metamorphosis?
A. Egg → Nymph → Adult
B. Egg → Larva → Pupa → Adult
C. Egg → Larva → Adult
D. Egg → Nymph → Pupa → Adult
,ANSWER B
RATIONALE: Complete metamorphosis, or holometabolism, involves four
distinct life stages: egg, larva, pupa, and adult. This process allows for
distinct ecological roles and reduced competition between stages.
QUESTION 4
The family Aphididae is best known for which type of feeding habit?
A. Chewing leaves
B. Piercing and sucking plant sap
C. Predatory on other insects
D. Scavenging
ANSWER B
RATIONALE: Aphids (Aphididae) are sap-sucking insects that use their
stylets to extract phloem fluids, often transmitting plant viruses as they
feed.
QUESTION 5
Which of the following insects is a known biological control agent for
aphids?
A. Colorado potato beetle
B. Lady beetle (Coccinellidae)
C. Corn rootworm
D. Whitefly
ANSWER B
RATIONALE: Lady beetles (commonly called ladybugs) are avid predators
of aphids, whiteflies, and soft-bodied pests, serving as beneficial natural
enemies in integrated pest management.
QUESTION 6
The term “entomology” refers to:
A. The study of ecosystems
B. The study of insects
C. The study of microbial life
D. The study of mammals
ANSWER B
, RATIONALE: Entomology derives from the Greek word “entomon”
meaning insect and “logia” meaning study, thus it is the scientific study of
insects.
QUESTION 7
Which insect order includes species that are important pollinators and
also social insects?
A. Diptera
B. Orthoptera
C. Hymenoptera
D. Thysanoptera
ANSWER C
RATIONALE: The order Hymenoptera includes bees, ants, and wasps—
many of which are critical pollinators and exhibit complex social behavior.
QUESTION 8
Insect exoskeletons are primarily composed of:
A. Cellulose
B. Chitin
C. Keratin
D. Pectin
ANSWER B
RATIONALE: Chitin is a complex polysaccharide forming the structural
component of the insect exoskeleton, providing strength and flexibility.
QUESTION 9
What is the primary function of insect halteres?
A. Sound production
B. Sensory reception
C. Stabilization during flight
D. Food storage
ANSWER C
RATIONALE: Halteres, found in flies (Diptera), are modified hindwings that
act as gyroscopic organs for balance and flight stability.
