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All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
Choose an option to check your answer.
A.
formation of wing veins
B.
storage of visual pigments only
C.
production of compound eyes
D.
water and ion recovery before waste elimination
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Correct Answer: D. water and ion recovery before waste elimination
Explanation:
The hindgut helps conserve water and regulate salts. This is important for insects living in dry environments.
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A.
expand tracheal volume and support ventilation in active insects
B.
form mandibles in larvae
C.
digest cellulose in the cuticle
D.
make eggs resistant to predators
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Correct Answer: A. expand tracheal volume and support ventilation in active insects
Explanation:
Air sacs are enlarged parts of the tracheal system. They can improve ventilation, reduce body weight, and support high oxygen demand during flight.
Choose an option to check your answer.
A.
pump hemolymph to wings
B.
secrete saliva that moistens food and may begin digestion
C.
detect light intensity
D.
produce the outer cuticle
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Correct Answer: B. secrete saliva that moistens food and may begin digestion
Explanation:
Insect salivary glands release secretions into the mouth region. Saliva can moisten food, contain enzymes, or support special functions in certain species.
Choose an option to check your answer.
A.
a gland producing eggs
B.
a sensory hair detecting odor
C.
a wax layer preventing water loss
D.
fast contracting muscle used in movement and flight
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Correct Answer: D. fast contracting muscle used in movement and flight
Explanation:
Insect skeletal muscles are striated and capable of rapid contractions. This is especially important in flight muscles and active locomotion.
Choose an option to check your answer.
A.
production of compound eyes
B.
storage of visual pigments only
C.
formation of wing veins
D.
water and ion recovery before waste elimination
Show Answer
Correct Answer: D. water and ion recovery before waste elimination
Explanation:
The hindgut helps conserve water and regulate salts. This is important for insects living in dry environments.
Choose an option to check your answer.
A.
make eggs resistant to predators
B.
form mandibles in larvae
C.
expand tracheal volume and support ventilation in active insects
D.
digest cellulose in the cuticle
Show Answer
Correct Answer: C. expand tracheal volume and support ventilation in active insects
Explanation:
Air sacs are enlarged parts of the tracheal system. They can improve ventilation, reduce body weight, and support high oxygen demand during flight.
Choose an option to check your answer.
A.
secrete saliva that moistens food and may begin digestion
B.
pump hemolymph to wings
C.
detect light intensity
D.
produce the outer cuticle
Show Answer
Correct Answer: A. secrete saliva that moistens food and may begin digestion
Explanation:
Insect salivary glands release secretions into the mouth region. Saliva can moisten food, contain enzymes, or support special functions in certain species.
Choose an option to check your answer.
A.
head with mandible, maxilla, labium, and labrum
B.
gut with crop, gizzard, and rectum only
C.
cuticle with wax, chitin, and epidermis
D.
legs with coxa, trochanter, femur, tibia, and tarsus
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Correct Answer: D. legs with coxa, trochanter, femur, tibia, and tarsus
Explanation:
Typical insect legs are jointed and include coxa, trochanter, femur, tibia, and tarsus. These segments allow flexible movement and adaptation for walking, jumping, digging, swimming, or grasping.
Choose an option to check your answer.
A.
hardened mouthparts from mandibles
B.
outgrowths of the thoracic body wall
C.
modified antennae from the head
D.
abdominal gills from the hindgut
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Correct Answer: B. outgrowths of the thoracic body wall
Explanation:
Insect wings are generally considered extensions of the thoracic body wall. They are supported by veins and articulated with thoracic sclerites.
Choose an option to check your answer.
A.
fusion of head segments during development
B.
chemical hardening of abdominal plates
C.
shedding of old cuticle
D.
joining forewings and hindwings to work together
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Correct Answer: D. joining forewings and hindwings to work together
Explanation:
Wing coupling links forewings and hindwings so they act as a single flight surface. This improves flight efficiency in many insects.
Choose an option to check your answer.
A.
external genital structures often help separate closely related species
B.
genitalia replace antennae in adults
C.
genitalia are used only for respiration
D.
all insects have identical genitalia
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Correct Answer: A. external genital structures often help separate closely related species
Explanation:
Insect genitalia are often species-specific. Entomologists use their structure to distinguish closely related species, especially when external body features look similar.
Choose an option to check your answer.
A.
enlarged hind femora store power for jumping
B.
flattened forelegs filter plankton
C.
abdominal spiracles form wings
D.
short antennae push hemolymph
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Correct Answer: A. enlarged hind femora store power for jumping
Explanation:
Jumping insects such as grasshoppers have enlarged hind femora with strong muscles. These legs store and release force for sudden jumps.
