LU 4 Intro SCAQ Practice

Introduction to Medical Entomology

1. What does medical entomology study?

   • a) The anatomy of insects

   • b) Arthropods affecting human health

   • c) Classification of plants

   • d) Chemical properties of insect venom

2. Which class do mosquitoes belong to?

   • a) Arachnida

   • b) Crustacea

   • c) Insecta

   • d) Myriapoda

3. What is a defining characteristic of insects?

   • a) Four pairs of legs

   • b) Lack of antennae

   • c) Three body segments and three pairs of legs

   • d) Presence of an exoskeleton without jointed legs

4. What type of metamorphosis do mosquitoes undergo?

   • a) Incomplete

   • b) Complete

   • c) Direct development

   • d) Parthenogenesis

Medically Important Arthropods

5. Which insect order includes mosquitoes?

   • a) Hemiptera

   • b) Blattaria

   • c) Diptera

   • d) Anoplura

6. Which of the following is NOT a reason arthropods are medically important?

   • a) They act as disease vectors

   • b) They improve soil fertility

   • c) They cause nuisance and discomfort

   • d) Some are poisonous to humans

7. What insect is known to mechanically transmit diseases without acting as a biological vector?

   • a) Mosquito

   • b) Housefly

   • c) Flea

   • d) Tick

Vector-Borne Diseases

8. Which mosquito genus is responsible for transmitting malaria?

   • a) Aedes

   • b) Anopheles

   • c) Culex

   • d) Mansonia

9. What type of pathogen causes malaria?

   • a) Bacterium

   • b) Virus

   • c) Protozoan

   • d) Nematode

10. Dengue fever is transmitted by:

• a) Anopheles mosquitoes

• b) Culex mosquitoes

• c) Aedes mosquitoes

• d) Sandflies

11. Which disease is primarily transmitted by the Culex mosquito?

• a) Malaria

• b) Dengue

• c) Filariasis

• d) Lyme disease

12. The blackfly (Simulium species) is the vector for which disease?

• a) Dengue

• b) River blindness (Onchocerciasis)

• c) Malaria

• d) Chagas disease

13. What pathogen is responsible for causing Lyme disease?

• a) Trypanosoma

• b) Plasmodium

• c) Borrelia

• d) Yersinia

Transmission of Insect-Borne Diseases

14. What type of transmission occurs when a pathogen develops and multiplies within the insect vector?

• a) Mechanical

• b) Biological

• c) Direct contact

• d) Respiratory

15. What type of biological transmission occurs when the pathogen only develops inside the vector but does not multiply?

• a) Propagative

• b) Cyclopropagative

• c) Cyclodevelopmental

• d) Passive

16. What is the primary factor influencing the transmission of vector-borne diseases?

• a) Insect abundance

• b) Blood type of the host

• c) Color of the host’s clothing

• d) Presence of household pets

Insect Orders and Their Medical Importance

17. Which insect order includes lice?

• a) Anoplura

• b) Hemiptera

• c) Siphonaptera

• d) Blattaria

18. What is the primary disease transmitted by Xenopsylla fleas?

• a) Malaria

• b) Yellow fever

• c) Bubonic plague

• d) Dengue

19. What is a distinguishing feature of fleas?

• a) They have wings

• b) They undergo complete metamorphosis

• c) They are endoparasites

• d) They have a sucking proboscis

20. Bedbugs belong to which insect order?

• a) Anoplura

• b) Hemiptera

• c) Siphonaptera

• d) Blattaria

21. What is a major characteristic of cockroaches that makes them a public health concern?

• a) They carry bacterial and viral pathogens mechanically

• b) They are vectors of malaria

• c) They can transmit HIV

• d) They undergo complete metamorphosis

Prevention and Control of Vector-Borne Diseases

22. What is an effective measure to control mosquito populations?

• a) Using antibiotics

• b) Wearing heavy clothing

• c) Eliminating stagnant water

• d) Keeping windows open at night

23. Why is insecticide resistance a major challenge in controlling mosquito populations?

• a) It makes mosquitoes larger

• b) It reduces the effectiveness of chemical control methods

• c) It increases mosquito lifespan

• d) It makes mosquitoes unable to bite humans

24. What is the primary function of insecticide-treated bed nets (ITNs)?

• a) Preventing mosquitoes from breeding

• b) Killing mosquitoes upon contact

• c) Acting as a physical barrier to mosquito bites

• d) Eliminating larvae in water sources

Medically Important Arachnids

25. Which arachnid is a vector of Lyme disease?

• a) Spider

• b) Scorpion

• c) Tick

• d) Mite

26. How do ticks transmit pathogens?

• a) By biting and injecting saliva containing pathogens

• b) Through mechanical contamination

• c) By feeding on human hair

• d) By secreting venom

27. Which order do scorpions belong to?

• a) Araneae

• b) Ixodida

• c) Scorpiones

• d) Diptera

Forensic and Medical Uses of Insects

28. What is the role of blowflies in forensic entomology?

• a) They feed on living tissue

• b) They help estimate the time of death

• c) They transmit malaria

• d) They act as biological vectors of bacteria

29. Maggot therapy involves the use of fly larvae to:

• a) Spread infections in wounds

• b) Remove necrotic tissue and promote healing

• c) Inject medicinal substances

• d) Act as a barrier against bacteria

30. What is the primary function of forensic entomology?

• a) Studying the effects of climate on insects

• b) Controlling mosquito populations

• c) Determining the post-mortem interval in criminal investigations

• d) Developing new insecticides

Answer Key

1 b 2. c 3. c 4. b 5. c 6. b 7. b 8. b 9. c 10. c

11 c 12. b 13. c 14. b 15. c 16. a 17. a 18. c 19. b 20. b

21 a 22. c 23. b 24. c 25. c 26. a 27. c 28. b 29. b 30. c