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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.
tube that pumps hemolymph only
B.
region where old cuticle is shed
C.
major site of digestion and nutrient absorption
D.
site where wings attach
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Correct Answer: C. major site of digestion and nutrient absorption
Explanation:
The midgut is the main digestive and absorptive region. Enzymes act on food here, and nutrients pass into the hemolymph.
Choose an option to check your answer.
A.
simple eyes on the head
B.
external openings that regulate air entry and water loss
C.
mouthparts that crush food
D.
glands that secrete pheromones
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Correct Answer: B. external openings that regulate air entry and water loss
Explanation:
Spiracles connect the tracheal system to the outside. Their opening and closing help balance oxygen uptake with water conservation.
Choose an option to check your answer.
A.
fluid that transports nutrients, hormones, wastes, and immune cells
B.
wax secreted by the epicuticle
C.
fluid specialized mainly for oxygen transport like vertebrate blood
D.
digestive juice produced by mandibles
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Correct Answer: A. fluid that transports nutrients, hormones, wastes, and immune cells
Explanation:
Hemolymph is the circulating fluid of insects. It supports transport and immunity, but oxygen transport is usually handled mainly by the tracheal system.
Choose an option to check your answer.
A.
nerves carry oxygen instead of signals
B.
muscles lengthen actively to push bones
C.
cuticle secretes hormones directly
D.
opposing muscles produce movement by contraction and relaxation
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Correct Answer: D. opposing muscles produce movement by contraction and relaxation
Explanation:
Insect muscles work in coordinated opposing groups. One muscle contracts to move a body part while another can return it, allowing controlled locomotion.
Choose an option to check your answer.
A.
region where old cuticle is shed
B.
tube that pumps hemolymph only
C.
major site of digestion and nutrient absorption
D.
site where wings attach
Show Answer
Correct Answer: C. major site of digestion and nutrient absorption
Explanation:
The midgut is the main digestive and absorptive region. Enzymes act on food here, and nutrients pass into the hemolymph.
Choose an option to check your answer.
A.
mouthparts that crush food
B.
glands that secrete pheromones
C.
simple eyes on the head
D.
external openings that regulate air entry and water loss
Show Answer
Correct Answer: D. external openings that regulate air entry and water loss
Explanation:
Spiracles connect the tracheal system to the outside. Their opening and closing help balance oxygen uptake with water conservation.
Choose an option to check your answer.
A.
wax secreted by the epicuticle
B.
fluid specialized mainly for oxygen transport like vertebrate blood
C.
fluid that transports nutrients, hormones, wastes, and immune cells
D.
digestive juice produced by mandibles
Show Answer
Correct Answer: C. fluid that transports nutrients, hormones, wastes, and immune cells
Explanation:
Hemolymph is the circulating fluid of insects. It supports transport and immunity, but oxygen transport is usually handled mainly by the tracheal system.
Choose an option to check your answer.
A.
fast contracting muscle used in movement and flight
B.
a gland producing eggs
C.
a wax layer preventing water loss
D.
a sensory hair detecting odor
Show Answer
Correct Answer: A. 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.
water and ion recovery before waste elimination
D.
formation of wing veins
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Correct Answer: C. 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.
expand tracheal volume and support ventilation in active insects
B.
make eggs resistant to predators
C.
form mandibles in larvae
D.
digest cellulose in the cuticle
Show Answer
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.
detect light intensity
B.
produce the outer cuticle
C.
pump hemolymph to wings
D.
secrete saliva that moistens food and may begin digestion
Show Answer
Correct Answer: D. 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 sensory hair detecting odor
B.
fast contracting muscle used in movement and flight
C.
a gland producing eggs
D.
a wax layer preventing water loss
Show Answer
Correct Answer: B. 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.
