National Mosquito and Vector Control
Exam Practice Questions And Correct
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Rationale 2026 Q&A| Instant Download
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1. A vector control professional is conducting surveillance in an urban
environment and identifies stagnant water accumulation in discarded
containers, clogged gutters, and poorly maintained drainage systems.
Which mosquito species is most commonly associated with breeding
in such artificial container habitats and is a primary vector of dengue
and Zika viruses?
A. Anopheles gambiae
B. Culex quinquefasciatus
C. Mansonia uniformis
D. Aedes aegypti
,Rationale: Aedes aegypti is highly adapted to urban environments and
breeds in artificial containers with clean water, making it the primary
vector of dengue, Zika, and chikungunya viruses.
2. During a vector control inspection, larvae are observed hanging at an
angle just below the water surface and possessing a siphon tube for
breathing. Which mosquito genus is most likely being observed?
A. Anopheles
B. Culex
C. Mansonia
D. Toxorhynchites
Rationale: Culex larvae hang at an angle and use a siphon tube to breathe,
unlike Anopheles larvae which lie parallel to the water surface.
3. A technician is selecting an insecticide for mosquito adult control and
wants rapid knockdown with minimal residual activity. Which class of
insecticides is most appropriate?
A. Organophosphates
B. Carbamates
C. Pyrethroids
D. Insect growth regulators
,Rationale: Pyrethroids provide rapid knockdown of adult mosquitoes with
relatively low persistence, making them suitable for space spraying.
4. Which mosquito species is the primary vector of malaria in sub-
Saharan Africa?
A. Aedes albopictus
B. Culex pipiens
C. Anopheles gambiae
D. Mansonia africana
Rationale: Anopheles gambiae is the most efficient malaria vector in sub-
Saharan Africa due to its strong preference for human blood and indoor
feeding habits.
5. A mosquito control program focuses on eliminating larval habitats
rather than applying chemicals. This strategy is best described as:
A. Chemical control
B. Biological control
C. Source reduction
D. Genetic control
Rationale: Source reduction involves eliminating breeding sites to prevent
mosquito development, which is a cornerstone of integrated vector
management.
, 6. Which stage of the mosquito life cycle is most targeted by larvicides?
A. Egg
B. Larva
C. Pupa
D. Adult
Rationale: Larvicides are designed to kill mosquito larvae before they
mature into adults, reducing population growth.
7. Bacillus thuringiensis israelensis (Bti) is commonly used in mosquito
control programs. What is its mode of action?
A. Disrupts nerve transmission
B. Inhibits chitin synthesis
C. Produces toxins that destroy larval gut cells
D. Prevents egg development
Rationale: Bti produces toxins that specifically target and destroy the gut
lining of mosquito larvae, leading to death.
8. A vector control officer notes that mosquito larvae are attached to
aquatic plants for respiration rather than surfacing. Which genus does
this behavior indicate?
A. Culex
B. Anopheles
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A vector control professional is conducting surveillance in an urban
environment and identifies stagnant water accumulation in discarded
containers, clogged gutters, and poorly maintained drainage systems.
Which mosquito species is most commonly associated with breeding
in such artificial container habitats and is a primary vector of dengue
and Zika viruses?
A. Anopheles gambiae
B. Culex quinquefasciatus
C. Mansonia uniformis
D. Aedes aegypti
,Rationale: Aedes aegypti is highly adapted to urban environments and
breeds in artificial containers with clean water, making it the primary
vector of dengue, Zika, and chikungunya viruses.
2. During a vector control inspection, larvae are observed hanging at an
angle just below the water surface and possessing a siphon tube for
breathing. Which mosquito genus is most likely being observed?
A. Anopheles
B. Culex
C. Mansonia
D. Toxorhynchites
Rationale: Culex larvae hang at an angle and use a siphon tube to breathe,
unlike Anopheles larvae which lie parallel to the water surface.
3. A technician is selecting an insecticide for mosquito adult control and
wants rapid knockdown with minimal residual activity. Which class of
insecticides is most appropriate?
A. Organophosphates
B. Carbamates
C. Pyrethroids
D. Insect growth regulators
,Rationale: Pyrethroids provide rapid knockdown of adult mosquitoes with
relatively low persistence, making them suitable for space spraying.
4. Which mosquito species is the primary vector of malaria in sub-
Saharan Africa?
A. Aedes albopictus
B. Culex pipiens
C. Anopheles gambiae
D. Mansonia africana
Rationale: Anopheles gambiae is the most efficient malaria vector in sub-
Saharan Africa due to its strong preference for human blood and indoor
feeding habits.
5. A mosquito control program focuses on eliminating larval habitats
rather than applying chemicals. This strategy is best described as:
A. Chemical control
B. Biological control
C. Source reduction
D. Genetic control
Rationale: Source reduction involves eliminating breeding sites to prevent
mosquito development, which is a cornerstone of integrated vector
management.
, 6. Which stage of the mosquito life cycle is most targeted by larvicides?
A. Egg
B. Larva
C. Pupa
D. Adult
Rationale: Larvicides are designed to kill mosquito larvae before they
mature into adults, reducing population growth.
7. Bacillus thuringiensis israelensis (Bti) is commonly used in mosquito
control programs. What is its mode of action?
A. Disrupts nerve transmission
B. Inhibits chitin synthesis
C. Produces toxins that destroy larval gut cells
D. Prevents egg development
Rationale: Bti produces toxins that specifically target and destroy the gut
lining of mosquito larvae, leading to death.
8. A vector control officer notes that mosquito larvae are attached to
aquatic plants for respiration rather than surfacing. Which genus does
this behavior indicate?
A. Culex
B. Anopheles
