PCA Insects Test Questions and Correct Answers

PCA Insects Test Questions and Correct
Answers

QUESTION 1

QUESTION: Which of the following insect orders is characterized by having piercing -sucking
mouthparts?
A. Coleoptera
B. Lepidoptera
C. Hemiptera
D. Hymenoptera

CORRECT ANSWER: C

RATIONALE: Hemiptera (true bugs) possess piercing-sucking mouthparts adapted for feeding on
plant sap or other insects. Coleoptera have chewing mouthparts, Lepidoptera have siphoning
mouthparts, and Hymenoptera have chewing or lapping mouthparts.



QUESTION 2

QUESTION: The larval stage of Lepidoptera is commonly referred to as:
A. Maggot
B. Caterpillar
C. Grub
D. Nymph

CORRECT 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

QUESTION: 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

CORRECT 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

QUESTION: 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

CORRECT 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

QUESTION: 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

CORRECT 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

,QUESTION: 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

CORRECT 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

QUESTION: Which insect order includes species that are important pollinators and also social
insects?
A. Diptera
B. Orthoptera
C. Hymenoptera
D. Thysanoptera

CORRECT ANSWER: C

RATIONALE: The order Hymenoptera includes bees, ants, and wasps—many of which are critical
pollinators and exhibit complex social behavior.



QUESTION 8

QUESTION: Insect exoskeletons are primarily composed of:
A. Cellulose
B. Chitin
C. Keratin
D. Pectin

CORRECT ANSWER: B

RATIONALE: Chitin is a complex polysaccharide forming the structural component of the insect
exoskeleton, providing strength and flexibility.



QUESTION 9

, QUESTION: What is the primary function of insect halteres?
A. Sound production
B. Sensory reception
C. Stabilization during flight
D. Food storage

CORRECT ANSWER: C

RATIONALE: Halteres, found in flies (Diptera), are modified hindwings that act as gyroscopic
organs for balance and flight stability.



QUESTION 10

QUESTION: Which type of metamorphosis does the grasshopper undergo?
A. Ametabolous
B. Hemimetabolous
C. Holometabolous
D. Hypermetamorphosis

CORRECT ANSWER: B

RATIONALE: Grasshoppers undergo incomplete or hemimetabolous metamorphosis, developing
from egg to nymph to adult without a pupal stage.

QUESTION 11

QUESTION: Which of the following insect structures is used for gas exchange?
A. Spiracles
B. Mandibles
C. Antennae
D. Ocelli

CORRECT ANSWER: A

RATIONALE: Spiracles are external openings to the tracheal system through which insects
exchange oxygen and carbon dioxide, allowing respiration without lungs.



QUESTION 12

QUESTION: The proboscis of a butterfly is adapted for:
A. Biting prey