Myiasis And House/Stable Flies.
Questions and Answers
- 1.
Myiasis is invasion of living tissue by the pupae of dipterous insects.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Invasion is by the larvae of dipterous insects.Rate this question:
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- 2.
Select all of the flys to cause an obligatory myiasis.
- A.
Dermatobia hominis
- B.
Cordylobia anthropophaga
- C.
Wohlfahrtia
- D.
Chrysomya bezziana
- E.
Lucilia
- F.
Calliphora
- G.
Cochliomya homonivorax
Correct Answer(s)
A. Dermatobia hominis
B. Cordylobia anthropophaga
D. Chrysomya bezziana
G. Cochliomya homonivoraxExplanation
The question asks for the flies that cause obligatory myiasis. Obligatory myiasis refers to a condition where the larvae of certain fly species must parasitize living tissue in order to complete their life cycle. Among the given options, Dermatobia hominis, Cordylobia anthropophaga, Chrysomya bezziana, and Cochliomya homonivorax are known to cause obligatory myiasis. These flies lay their eggs on or near living tissue, and the hatched larvae feed on the host's flesh. Therefore, selecting these flies would cause obligatory myiasis.Rate this question:
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- 3.
Sarcophaga has a chess board appearance on its abdomen.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sarcophaga is a type of fly that is commonly known as the flesh fly. One distinguishing characteristic of the Sarcophaga fly is that it has a chess board appearance on its abdomen. This means that the abdomen of the fly has a pattern that resembles the squares on a chess board. This pattern is unique to Sarcophaga flies and helps to identify them. Therefore, the statement that Sarcophaga has a chess board appearance on its abdomen is true.Rate this question:
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- 4.
Cochliomya and chrysomya are called 'the flesh flies'.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
No, they are the flys of screw worms. Flesh flies are Wohlfahrtia and Sarcophaga.Rate this question:
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- 5.
Which flies have prominent bristles on their dorsal thorax, are metallic and have larvae without spines.
- A.
Chrysomya and Cochliomya
- B.
Calliphoridae - Calliphora and Lucilia
- C.
Tumbu
- D.
Dermatobia
Correct Answer
B. Calliphoridae - Calliphora and LuciliaExplanation
Calliphoridae is the family of flies that includes the genera Calliphora and Lucilia. These flies have prominent bristles on their dorsal thorax, giving them a metallic appearance. Additionally, their larvae do not have spines. Therefore, the correct answer is Calliphoridae - Calliphora and Lucilia.Rate this question:
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- 6.
Cordylobia anthropophaga is also known as the Bot Fly.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
It is 'tumbu or mango' fly. Bot fly is dermatobia hominis.Rate this question:
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- 7.
Which fly is metallic, is an obligate and has 3 stripes on its thorax.
- A.
Stomoxys calcitrans
- B.
Musca domestica
- C.
Lucilia
- D.
Cochliomya homonivorax
Correct Answer
D. Cochliomya homonivoraxExplanation
Cochliomya hominivorax, also known as the primary screwworm fly, is a metallic fly that is obligate and has 3 stripes on its thorax. This fly is known for its parasitic behavior, as it infests the open wounds of warm-blooded animals, including humans, and feeds on their tissue. The metallic coloration and distinct thorax stripes are characteristic features of this species.Rate this question:
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- 8.
Tumbu fly likes to lay its eggs in urine soaked clothes.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Ironing clothes is a method of control.Rate this question:
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- 9.
Which fly produces larvae which live in the host for 10+ weeks
- A.
Tumbu
- B.
Dermatobia hominis
- C.
Calliphora
- D.
Muscina stabulans
Correct Answer
B. Dermatobia hominisExplanation
Dermatobia hominis is the correct answer because it is commonly known as the human botfly, which lays its eggs on the skin of animals or humans. The larvae then burrow into the host's skin and live there for a period of 10+ weeks, causing painful skin lesions. The other options, Tumbu, Calliphora, and Muscina stabulans, do not have a similar life cycle where their larvae live in the host for such a long duration.Rate this question:
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- 10.
Wing vein 4 bends up sharply to meet wing vein 3 in flies of the Fannia genus.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This occurs in Musca domestica. In fannia they are almost parallel.Rate this question:
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- 11.
Blinding trachoma is spread by Musca sorbens
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
It is caused by Chlamydia trachomata and is common in refugee camps.Rate this question:
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- 12.
The larvae of flies of the Fannia genus have lateral processes.
- A.
True
- B.
False
Correct Answer
A. True -
- 13.
Which of these has a proboscis?
- A.
Musca domestica
- B.
Stomoxys
- C.
Calliphora
- D.
Musca sorbens
Correct Answer
B. StomoxysExplanation
Stomoxys has a proboscis. A proboscis is a long, tubular mouthpart that is used for feeding. It is commonly found in insects such as flies and mosquitoes. Stomoxys, also known as the stable fly, is a blood-sucking fly that feeds on the blood of mammals, including humans. Its proboscis allows it to pierce the skin and suck blood.Rate this question:
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- 14.
House flys transmit enteric bacteria
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Including shigella, E.coli, Salmonella and Cholera.
Viruses include polio
They may transmit helminth eggs.Rate this question:
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- 15.
Stomoxys calcitrans is an important disease vector.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Whilst it can transmit trypanosomiasis, it is unimportant in its transmission and it doesn't spread other bacteria or viruses as it doesn't go to faeces or festering wounds.Rate this question:
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- 16.
Only female stomoxys flies blood feed.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Both males and females blood feed.Rate this question:
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- 17.
Musca domestica feeds by:
- A.
Vomiting up food from its crop to digest solid material
- B.
Feeding on plant sugars
- C.
Proboscis
Correct Answer
A. Vomiting up food from its crop to digest solid materialExplanation
The correct answer is "Vomiting up food from its crop to digest solid material." Musca domestica, also known as the housefly, feeds by regurgitating food from its crop, which is a specialized organ in its digestive system. This allows the fly to break down solid food into a liquid form that it can then ingest. This process is necessary because the housefly's mouthparts, known as the proboscis, are adapted for sucking up liquid food rather than chewing solid material. Feeding on plant sugars is not the primary method of nutrition for houseflies.Rate this question:
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- 18.
Which methods can be used used in the control of houseflies. Select all that apply.
- A.
Packing tips tight to kill larvae
- B.
Bacillus thurnigiensis as a biological insecticide.
- C.
Bed nets
- D.
Insecticide.
Correct Answer(s)
A. Packing tips tight to kill larvae
B. Bacillus thurnigiensis as a biological insecticide.
D. Insecticide.Explanation
Packing tips tight to kill larvae is a method that can be used to control houseflies because it helps prevent the larvae from hatching and developing into adult flies. Bacillus thuringiensis is a biological insecticide that specifically targets and kills houseflies. Insecticide is a general term that includes various chemical substances used to kill or repel houseflies. Bed nets, on the other hand, are typically used to prevent mosquito bites and are not effective in controlling houseflies.Rate this question:
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- 19.
Musca sorbens is a vector of disease in which areas:
- A.
Africa, Asia, Pacific
- B.
Africa
- C.
South America and Africa
- D.
Africa and Europe
Correct Answer
A. Africa, Asia, PacificExplanation
Musca sorbens is a vector of disease in Africa, Asia, and the Pacific. This means that this particular species of fly is responsible for transmitting diseases in these regions. It is important to be aware of this vector in order to prevent and control the spread of diseases in these areas.Rate this question:
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- 20.
Fannia scalaris is known as the latrine fly.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Fannia scalaris is indeed known as the latrine fly. This species of fly is commonly found in and around human habitats, particularly in areas with poor sanitation. They are attracted to and breed in decaying organic matter, including feces, which is why they are often found near latrines and sewage systems. Therefore, the statement that Fannia scalaris is known as the latrine fly is true.Rate this question:
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- 21.
Musca domestica defecates roughly every...
- A.
20 minutes
- B.
Minute
- C.
5 mins
- D.
10 minutes
Correct Answer
C. 5 minsExplanation
Musca domestica, commonly known as the housefly, is known to defecate approximately every 5 minutes. This frequent defecation is due to their rapid digestion process. Houseflies feed on a variety of organic matter, including feces, and their digestive system is designed to quickly process this food source. As a result, they produce waste frequently, making them potential carriers of diseases and contaminants. This behavior highlights the importance of proper hygiene and sanitation measures to prevent the spread of pathogens associated with houseflies.Rate this question:
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- 22.
How many larval instars does musca domestica have?
- A.
3
- B.
4
- C.
5
- D.
2
Correct Answer
A. 3Explanation
Musca domestica, commonly known as the housefly, has three larval instars. During its life cycle, the housefly undergoes complete metamorphosis, which includes four stages: egg, larva, pupa, and adult. The larval stage is divided into three instars, during which the larvae molt and grow in size. After the third instar, the larvae enter the pupal stage and eventually emerge as adult houseflies. Therefore, the correct answer is 3.Rate this question:
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- 23.
Musca domestica is characterised by:
- A.
A discal cell
- B.
Wings that fold over its body
- C.
Wing vein 4 bending up sharply to wing vein 3.
- D.
A hatchet cell
Correct Answer
C. Wing vein 4 bending up sharply to wing vein 3.Explanation
Musca domestica is characterized by wing vein 4 bending up sharply to wing vein 3. This means that in the fly's wing structure, the fourth wing vein bends sharply upwards towards the third wing vein. This characteristic is unique to Musca domestica and helps in identifying and distinguishing it from other species. The presence of this specific wing vein arrangement is a defining feature of Musca domestica.Rate this question:
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- 24.
Flies of the fannia genus have wing veins 4 and 3 that are almost parallel.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Flies of the fannia genus have wing veins 4 and 3 that are almost parallel. This statement is true because the fannia genus of flies does indeed have wing veins 4 and 3 that are almost parallel. This characteristic is a distinguishing feature of flies in this genus.Rate this question:
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