MCQ Collection
BS Zoology Semester Exam MCQs
Practice BS Zoology Semester Exam questions with answers and explanations.
Choose an option to check your answer.
A.
cuticular gland producing wax
B.
heart chamber pumping hemolymph
C.
mouthpart specialized for chewing
D.
sensory organ in the antenna detecting movement and vibration
Show Answer
Correct Answer: D. sensory organ in the antenna detecting movement and vibration
Explanation:
Johnston's organ is located in the pedicel of the antenna. It detects antennal movements and is important in hearing or flight-related sensory feedback in some insects.
Choose an option to check your answer.
A.
forms the compound eye lens
B.
promotes molting by triggering cuticle replacement processes
C.
acts only as an oxygen carrier
D.
prevents all growth permanently
Show Answer
Correct Answer: B. promotes molting by triggering cuticle replacement processes
Explanation:
Ecdysone is a major molting hormone. It activates events leading to apolysis, new cuticle formation, and eventual shedding of the old cuticle.
Choose an option to check your answer.
A.
nymphs resemble adults but lack fully developed wings and reproductive organs
B.
eggs hatch into vertebrate-like embryos
C.
larva and pupa are always present
D.
adult insects never molt
Show Answer
Correct Answer: A. nymphs resemble adults but lack fully developed wings and reproductive organs
Explanation:
Incomplete metamorphosis lacks a pupal stage. Nymphs gradually develop adult structures through successive molts.
Choose an option to check your answer.
A.
cells that pump hemolymph
B.
cells that remove uric acid
C.
cells that harden the cuticle
D.
cells that respond to light
Show Answer
Correct Answer: D. cells that respond to light
Explanation:
Photoreceptors detect light and begin visual processing. They occur in compound eyes and ocelli, helping insects respond to movement, day length, and orientation cues.
Choose an option to check your answer.
A.
sensory organ in the antenna detecting movement and vibration
B.
mouthpart specialized for chewing
C.
cuticular gland producing wax
D.
heart chamber pumping hemolymph
Show Answer
Correct Answer: A. sensory organ in the antenna detecting movement and vibration
Explanation:
Johnston's organ is located in the pedicel of the antenna. It detects antennal movements and is important in hearing or flight-related sensory feedback in some insects.
Choose an option to check your answer.
A.
forms the compound eye lens
B.
promotes molting by triggering cuticle replacement processes
C.
acts only as an oxygen carrier
D.
prevents all growth permanently
Show Answer
Correct Answer: B. promotes molting by triggering cuticle replacement processes
Explanation:
Ecdysone is a major molting hormone. It activates events leading to apolysis, new cuticle formation, and eventual shedding of the old cuticle.
Choose an option to check your answer.
A.
eggs hatch into vertebrate-like embryos
B.
larva and pupa are always present
C.
adult insects never molt
D.
nymphs resemble adults but lack fully developed wings and reproductive organs
Show Answer
Correct Answer: D. nymphs resemble adults but lack fully developed wings and reproductive organs
Explanation:
Incomplete metamorphosis lacks a pupal stage. Nymphs gradually develop adult structures through successive molts.
Choose an option to check your answer.
A.
cells that respond to light
B.
cells that remove uric acid
C.
cells that harden the cuticle
D.
cells that pump hemolymph
Show Answer
Correct Answer: A. cells that respond to light
Explanation:
Photoreceptors detect light and begin visual processing. They occur in compound eyes and ocelli, helping insects respond to movement, day length, and orientation cues.
Choose an option to check your answer.
A.
mouthpart specialized for chewing
B.
cuticular gland producing wax
C.
heart chamber pumping hemolymph
D.
sensory organ in the antenna detecting movement and vibration
Show Answer
Correct Answer: D. sensory organ in the antenna detecting movement and vibration
Explanation:
Johnston's organ is located in the pedicel of the antenna. It detects antennal movements and is important in hearing or flight-related sensory feedback in some insects.
Choose an option to check your answer.
A.
prevents all growth permanently
B.
forms the compound eye lens
C.
promotes molting by triggering cuticle replacement processes
D.
acts only as an oxygen carrier
Show Answer
Correct Answer: C. promotes molting by triggering cuticle replacement processes
Explanation:
Ecdysone is a major molting hormone. It activates events leading to apolysis, new cuticle formation, and eventual shedding of the old cuticle.
Choose an option to check your answer.
A.
adult insects never molt
B.
nymphs resemble adults but lack fully developed wings and reproductive organs
C.
larva and pupa are always present
D.
eggs hatch into vertebrate-like embryos
Show Answer
Correct Answer: B. nymphs resemble adults but lack fully developed wings and reproductive organs
Explanation:
Incomplete metamorphosis lacks a pupal stage. Nymphs gradually develop adult structures through successive molts.
Choose an option to check your answer.
A.
organs filtering nitrogenous waste
B.
tissues producing egg shells
C.
sensory structures detecting touch, vibration, or movement
D.
glands releasing digestive enzymes
Show Answer
Correct Answer: C. sensory structures detecting touch, vibration, or movement
Explanation:
Mechanoreceptors detect physical forces such as touch, vibration, stretch, or air movement. Sensory hairs and chordotonal organs are common insect examples.
