Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
Choose an option to check your answer.
A.
enlarged hind femora store power for jumping
B.
short antennae push hemolymph
C.
flattened forelegs filter plankton
D.
abdominal spiracles form wings
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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.
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A.
replace the nervous system
B.
support the wing and carry nerves, tracheae, and hemolymph
C.
secrete digestive enzymes
D.
form the egg shell
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Correct Answer: B. support the wing and carry nerves, tracheae, and hemolymph
Explanation:
Wing veins strengthen insect wings and also contain tracheae, nerves, and hemolymph. Venation patterns are important in insect identification.
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A.
contains many digestive, excretory, reproductive, and respiratory structures
B.
forms the main biting region
C.
bears all adult walking legs
D.
contains only compound eyes
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Correct Answer: A. contains many digestive, excretory, reproductive, and respiratory structures
Explanation:
The abdomen is the posterior body region of insects. It houses many internal organs, including gut, reproductive organs, Malpighian tubules, tracheae, and the dorsal vessel.
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A.
lift depends on closed blood circulation
B.
lift is produced only by the digestive system
C.
lift is generated as wings move air and create pressure differences
D.
lift is caused by chewing mandibles
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Correct Answer: C. lift is generated as wings move air and create pressure differences
Explanation:
Insect flight depends on wing motion, air flow, and pressure differences that create lift. Wing shape, beat frequency, and angle of attack influence flight performance.
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A.
wing veins that strengthen the abdomen
B.
hormonal glands that control molting
C.
small cervical plates allow flexible head movement
D.
digestive plates that crush food
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Correct Answer: C. 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.
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A.
antennae become chewing jaws
B.
wings become endocrine glands
C.
hind legs flatten for swimming
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.
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A.
muscles change thoracic shape to move wings indirectly
B.
muscles attach only to antennae
C.
muscles attach directly to wing bases
D.
muscles work only during molting
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Correct Answer: C. 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.
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A.
internal endocrine glands
B.
paired posterior sensory appendages in some insects
C.
mouth hooks used for sucking nectar
D.
wing veins in the mesothorax
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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.
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A.
rapid wing beats and precise control keep the insect in one position
B.
continuous molting during flight
C.
conversion of wings into legs
D.
loss of thoracic muscles
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Correct Answer: A. rapid wing beats and precise control keep the insect in one position
Explanation:
Hovering requires strong flight muscles and fine control of wing movement. Many flies and some bees can maintain position in air while feeding or surveying the environment.
Choose an option to check your answer.
A.
hormonal glands that control molting
B.
digestive plates that crush food
C.
wing veins that strengthen the abdomen
D.
small cervical plates allow flexible head movement
Show Answer
Correct Answer: D. 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.
modified forelegs grasp prey
B.
antennae become chewing jaws
C.
hind legs flatten for swimming
D.
wings become endocrine glands
Show Answer
Correct Answer: A. 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 change thoracic shape to move wings indirectly
B.
muscles attach directly to wing bases
C.
muscles attach only to antennae
D.
muscles work only during molting
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.
