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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.
wing veins in the mesothorax
B.
internal endocrine glands
C.
paired posterior sensory appendages in some insects
D.
mouth hooks used for sucking nectar
Show Answer
Correct Answer: C. paired posterior sensory appendages in some insects
Explanation:
Cerci are paired appendages at the end of the abdomen in some insects such as cockroaches. They often detect air movements or touch.
Choose an option to check your answer.
A.
small cervical plates allow flexible head movement
B.
hormonal glands that control molting
C.
digestive plates that crush food
D.
wing veins that strengthen the abdomen
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Correct Answer: A. small cervical plates allow flexible head movement
Explanation:
The insect neck contains cervical sclerites and membranes. This arrangement allows the head to move while still connecting it firmly to the thorax.
Choose an option to check your answer.
A.
antennae become chewing jaws
B.
hind legs flatten for swimming
C.
wings become endocrine glands
D.
modified forelegs grasp prey
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Correct Answer: D. modified forelegs grasp prey
Explanation:
Raptorial forelegs are adapted for catching and holding prey. The praying mantis is a classic example of this predatory modification.
Choose an option to check your answer.
A.
muscles work only during molting
B.
muscles attach directly to wing bases
C.
muscles attach only to antennae
D.
muscles change thoracic shape to move wings indirectly
Show Answer
Correct Answer: B. muscles attach directly to wing bases
Explanation:
Direct flight muscles attach to wing bases and move wings directly. This mechanism occurs in some insect groups and allows controlled wing motion.
Choose an option to check your answer.
A.
mouth hooks used for sucking nectar
B.
wing veins in the mesothorax
C.
paired posterior sensory appendages in some insects
D.
internal endocrine glands
Show Answer
Correct Answer: C. paired posterior sensory appendages in some insects
Explanation:
Cerci are paired appendages at the end of the abdomen in some insects such as cockroaches. They often detect air movements or touch.
Choose an option to check your answer.
A.
wing veins that strengthen the abdomen
B.
small cervical plates allow flexible head movement
C.
hormonal glands that control molting
D.
digestive plates that crush food
Show Answer
Correct Answer: B. small cervical plates allow flexible head movement
Explanation:
The insect neck contains cervical sclerites and membranes. This arrangement allows the head to move while still connecting it firmly to the thorax.
Choose an option to check your answer.
A.
wings become endocrine glands
B.
hind legs flatten for swimming
C.
modified forelegs grasp prey
D.
antennae become chewing jaws
Show Answer
Correct Answer: C. modified forelegs grasp prey
Explanation:
Raptorial forelegs are adapted for catching and holding prey. The praying mantis is a classic example of this predatory modification.
Choose an option to check your answer.
A.
muscles attach only to antennae
B.
muscles work only during molting
C.
muscles change thoracic shape to move wings indirectly
D.
muscles attach directly to wing bases
Show Answer
Correct Answer: D. muscles attach directly to wing bases
Explanation:
Direct flight muscles attach to wing bases and move wings directly. This mechanism occurs in some insect groups and allows controlled wing motion.
Choose an option to check your answer.
A.
mouth hooks used for sucking nectar
B.
paired posterior sensory appendages in some insects
C.
internal endocrine glands
D.
wing veins in the mesothorax
Show Answer
Correct Answer: B. paired posterior sensory appendages in some insects
Explanation:
Cerci are paired appendages at the end of the abdomen in some insects such as cockroaches. They often detect air movements or touch.
Choose an option to check your answer.
A.
foregut, midgut, and hindgut
B.
prothorax, mesothorax, and metathorax
C.
scape, pedicel, and flagellum
D.
epicuticle, exocuticle, and endocuticle
Show Answer
Correct Answer: B. prothorax, mesothorax, and metathorax
Explanation:
The insect thorax is divided into prothorax, mesothorax, and metathorax. Each segment bears a pair of legs, while wings usually attach to the mesothorax and metathorax.
Choose an option to check your answer.
A.
broad legs with pollen baskets
B.
needle-like legs for blood feeding
C.
leaf-like legs used as gills
D.
long, slender legs support rapid running
Show Answer
Correct Answer: D. long, slender legs support rapid running
Explanation:
Cursorial legs are adapted for fast running. Their length and shape help insects move quickly across surfaces, useful in predators and escape-oriented species.
Choose an option to check your answer.
A.
muscles close mouthparts during feeding
B.
muscles push air through spiracles only
C.
muscles digest old cuticle
D.
muscles deform the thorax and move wings indirectly
Show Answer
Correct Answer: D. muscles deform the thorax and move wings indirectly
Explanation:
Indirect flight muscles do not attach directly to wings. Instead, they change the shape of the thorax, causing the wings to beat rapidly.
