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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.
digestive juice produced by mandibles
B.
fluid specialized mainly for oxygen transport like vertebrate blood
C.
fluid that transports nutrients, hormones, wastes, and immune cells
D.
wax secreted by the epicuticle
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.
main excretory tube in the gut
B.
main pumping organ of insect circulation
C.
main lens of the compound eye
D.
main chewing organ of the mouth
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Correct Answer: B. main pumping organ of insect circulation
Explanation:
The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.
Choose an option to check your answer.
A.
main chewing organ of the mouth
B.
main pumping organ of insect circulation
C.
main lens of the compound eye
D.
main excretory tube in the gut
Show Answer
Correct Answer: B. main pumping organ of insect circulation
Explanation:
The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.
Choose an option to check your answer.
A.
main lens of the compound eye
B.
main pumping organ of insect circulation
C.
main chewing organ of the mouth
D.
main excretory tube in the gut
Show Answer
Correct Answer: B. main pumping organ of insect circulation
Explanation:
The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.
Choose an option to check your answer.
A.
main excretory tube in the gut
B.
main lens of the compound eye
C.
main pumping organ of insect circulation
D.
main chewing organ of the mouth
Show Answer
Correct Answer: C. main pumping organ of insect circulation
Explanation:
The dorsal vessel functions as the insect heart and aorta. It moves hemolymph forward through the body cavity.
Choose an option to check your answer.
A.
blood remains completely inside capillaries
B.
oxygen is carried mainly by red blood cells
C.
water moves only through kidneys
D.
hemolymph bathes organs directly in the hemocoel
Show Answer
Correct Answer: D. hemolymph bathes organs directly in the hemocoel
Explanation:
Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.
Choose an option to check your answer.
A.
oxygen is carried mainly by red blood cells
B.
blood remains completely inside capillaries
C.
water moves only through kidneys
D.
hemolymph bathes organs directly in the hemocoel
Show Answer
Correct Answer: D. hemolymph bathes organs directly in the hemocoel
Explanation:
Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.
Choose an option to check your answer.
A.
blood remains completely inside capillaries
B.
oxygen is carried mainly by red blood cells
C.
water moves only through kidneys
D.
hemolymph bathes organs directly in the hemocoel
Show Answer
Correct Answer: D. hemolymph bathes organs directly in the hemocoel
Explanation:
Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.
Choose an option to check your answer.
A.
oxygen is carried mainly by red blood cells
B.
blood remains completely inside capillaries
C.
water moves only through kidneys
D.
hemolymph bathes organs directly in the hemocoel
Show Answer
Correct Answer: D. hemolymph bathes organs directly in the hemocoel
Explanation:
Insects have an open circulatory system. Hemolymph leaves vessels and flows through body spaces, transporting nutrients, wastes, and hormones but usually not most oxygen.
Choose an option to check your answer.
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
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.
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.
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
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.
