Chpt.6b Flashcards
26 Which statement accurately describes the feeding habits of both male and female Tsetse flies a) Both exclusively feed on blood b) Both feed on blood though females primarily c) Both feed on plant nectar and juices d) Males feed on blood females on plant nectar
Explanation While both sexes of the Tsetse fly feed on blood females rely heavily on it for producing offspring The excerpt mentions that both male and female Tsetse flies feed on blood However it also notes Males and females both feed on the blood of a variety of mammals and birds but females in addition feed on the blood of a few species of mammals and birds
27 In what type of environment are Tsetse flies most commonly found a) Arid deserts b) Savannah areas forests and marshes c) High altitude mountainous regions d) Coastal areas
Explanation The source mentions that Tsetse flies are frequently found in savannah areas forests and marshy areas implying a preference for environments with some level of moisture and vegetation
28 What is a key characteristic of the Glossina species that makes controlling their populations challenging a) They have a very short lifespan b) They reproduce at an extremely rapid rate c) They give birth to live young which reduces the vulnerability of the early life stages d) They are highly resistant to most insecticides
Explanation Unlike many other flies that lay eggs Tsetse flies are viviparous meaning they give birth to live young This offers a level of protection to their offspring making control measures that target eggs or larvae less effective
29 What is the primary mode of transmission for African trypanosomiasis a) Consumption of contaminated food or water b) Bite of an infected Tsetse fly c) Direct contact with an infected individual d) Inhalation of airborne parasites
Explanation African trypanosomiasis or sleeping sickness is spread through the bite of an infected Tsetse fly This fly acts as a vector carrying the Trypanosoma parasites that cause the disease
30 What is the causative agent for West African sleeping sickness a) Trypanosoma brucei rhodesiense b) Trypanosoma brucei gambiense c) Both a and b d) Neither a nor b
Explanation The excerpt states that both T b gambiense and T b rhodesiense cause sleeping sickness but their geographic distribution differs It also points out that there are two subspecies of T brucei gambiense found in West Africa
31 Which of the following is characteristic of East African sleeping sickness a) Chronic course of disease b) Primarily affects humans c) More acute and often fatal within a year d) Transmitted by T brucei gambiense
Explanation The excerpt describes East African sleeping sickness as a more acute form of the disease with a higher mortality rate It highlights that it can result to death in less than a year and involves major game animals as reservoir hosts
32 Besides blood what other bodily fluids can be used to diagnose trypanosomiasis a) Saliva b) Urine c) Cerebrospinal fluid d) Sweat
Explanation The source mentions that diagnosis of trypanosomiasis can be achieved through examination of peripheral blood bone marrow lymph nodes or cerebrospinal fluid
33 Which drug is primarily used in the treatment of late-stage trypanosomiasis especially when the nervous system is involved a) Suramin b) Pentamidine c) Melarsoprol d) Ivermectin
Explanation The excerpt explicitly states that Melarsoprol is used for late cases of trypanosomiasis especially when there are neurological complications
34 Which of the following is NOT mentioned as a control measure for trypanosomiasis a) Use of insecticides b) Trapping of Tsetse flies c) Vaccination of susceptible populations d) Environmental manipulation to reduce fly breeding habitats
Explanation The excerpt outlines several control measures for trypanosomiasis including the use of insecticides traps and environmental management techniques However it does not mention vaccination as a viable option
35 What feature of a house fly’s mouthparts makes them well-suited for feeding on a wide variety of substances a) Sharp piercing mandibles b) Elongated needle-like proboscis c) Sponging mouthparts adapted for sucking up liquids and semi-liquids d) Powerful grinding molars
Explanation The excerpt describes house flies as having mouthparts proboscis adapted for sucking up fluid or semi fluid foods These sponging mouthparts allow them to easily feed on diverse food sources including liquids semi-liquids and even partially dissolved solids
36 What is the primary role of the hairs on a house fly’s body a) Sensory perception b) Camouflage c) Mechanical transmission of pathogens d) Thermoregulation
Explanation The text emphasizes the role of house flies in mechanical transmission of pathogens The hairs on their body can easily pick up and transport disease-causing organisms
11 Microfilariae of Loa loa are typically found in the peripheral blood of their host a) Throughout the day and night b) During the day c) Only at dawn and dusk d) Only during the rainy season
Explanation The excerpt states that Microfilariae of Loa loa are found in the peripheral blood of man during the day especially in the morning hours
12 How is the third stage larvae L3 of Loa loa transmitted to humans a) Through contaminated water b) Through direct skin contact c) By the bite of a Chrysops species fly d) By eating undercooked meat
Explanation The text explains that the L3 larvae of Loa loa are transmitted to the body of the host through the punctured skin by a Chrysops species fly
13 Tsetse flies are classified within which genus a) Tabanus b) Chrysops c) Musca d) Glossina
Explanation The excerpt explicitly states that Tsetse flies belong to the genus Glossina
14 What makes Tsetse flies unique compared to many other fly species a) Their exceptionally large size b) Their ability to transmit malaria c) Their viviparous reproduction d) Their preference for feeding on carrion
Explanation The text highlights that Tsetse flies are viviparous meaning they give birth to live young rather than laying eggs
