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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.
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.
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
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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.
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
Show Answer
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.
mouthparts that crush food
B.
simple eyes on the head
C.
external openings that regulate air entry and water loss
D.
glands that secrete pheromones
Show Answer
Correct Answer: C. 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.
glands that secrete pheromones
B.
external openings that regulate air entry and water loss
C.
simple eyes on the head
D.
mouthparts that crush food
Show Answer
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.
antennae absorb all oxygen
B.
blood carries oxygen in closed vessels
C.
air-filled tubes deliver oxygen directly to tissues
D.
gills pump hemolymph into the heart
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Correct Answer: C. air-filled tubes deliver oxygen directly to tissues
Explanation:
Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.
Choose an option to check your answer.
A.
gills pump hemolymph into the heart
B.
air-filled tubes deliver oxygen directly to tissues
C.
blood carries oxygen in closed vessels
D.
antennae absorb all oxygen
Show Answer
Correct Answer: B. air-filled tubes deliver oxygen directly to tissues
Explanation:
Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.
Choose an option to check your answer.
A.
antennae absorb all oxygen
B.
air-filled tubes deliver oxygen directly to tissues
C.
blood carries oxygen in closed vessels
D.
gills pump hemolymph into the heart
Show Answer
Correct Answer: B. air-filled tubes deliver oxygen directly to tissues
Explanation:
Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.
Choose an option to check your answer.
A.
gills pump hemolymph into the heart
B.
blood carries oxygen in closed vessels
C.
air-filled tubes deliver oxygen directly to tissues
D.
antennae absorb all oxygen
Show Answer
Correct Answer: C. air-filled tubes deliver oxygen directly to tissues
Explanation:
Most insects use a tracheal system for gas exchange. Oxygen travels through spiracles and tracheae directly to tissues, reducing dependence on blood for oxygen transport.
Choose an option to check your answer.
A.
secrete saliva for chewing
B.
detect sound vibrations
C.
remove nitrogenous waste and help osmoregulation
D.
produce wing scales
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Correct Answer: C. remove nitrogenous waste and help osmoregulation
Explanation:
Malpighian tubules collect nitrogenous wastes from hemolymph and empty them into the gut. They also help maintain water and ion balance.
Choose an option to check your answer.
A.
produce wing scales
B.
detect sound vibrations
C.
remove nitrogenous waste and help osmoregulation
D.
secrete saliva for chewing
Show Answer
Correct Answer: C. remove nitrogenous waste and help osmoregulation
Explanation:
Malpighian tubules collect nitrogenous wastes from hemolymph and empty them into the gut. They also help maintain water and ion balance.
Choose an option to check your answer.
A.
remove nitrogenous waste and help osmoregulation
B.
produce wing scales
C.
detect sound vibrations
D.
secrete saliva for chewing
Show Answer
Correct Answer: A. remove nitrogenous waste and help osmoregulation
Explanation:
Malpighian tubules collect nitrogenous wastes from hemolymph and empty them into the gut. They also help maintain water and ion balance.
