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REHS VECTORS Exam With Correct Questions And Answers 2024
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REHS VECTORS Exam With Correct Questions And Answers 2024
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REHS VECTORS Exam With Correct Questions And Answers 2024Which sex of the mosquito bites? - CORRECT ANSWERS--Females.
2.Why does a female mosquito have to take a blood meal? - CORRECT ANSWERS--
Needed in order to mature her eggs.
3.Why are mosquitos known as a vector? - CORRECT ANSWERS--Because they release infectious agents when taking a blood meal. Inoculation.
4.Describe the diseases which a mosquito can spread. - CORRECT ANSWERS--Four common diseases of the mosquito are Plasmodium Vivax (Malaria), Yellow Fever, Encephalitis, Filariasis.
5.Describe the lifecycle of a mosquito. - CORRECT ANSWERS--11 to 16 day cycle. Adult female mosquitoes lays eggs in water, eggs hatch in 2-3 days into larvae, larvae feeds on organic matter, larvae turn into pupa (4-10 days later). Pupae then turns into an adult mosquito in 2 days.
6.What are some larval characteristics of mosquitos? - CORRECT ANSWERS--
Depending on type of species. Anopheles larvae (malaria vector) are flat looking and wiggle horizontally up and down. -culex larvae (western st. louis encephalitis) has a long
breathing tube. Tube can be seen out of the water. -The Aedes larvae (yellow fever) has
a short breathing tube. It moves at different angles.
7.Describe how mosquito surveys are performed. - CORRECT ANSWERS--check for flow characteristics, stagnancy, and pollution levels in open bodies of water. Mosquito dippers used to capture larvae and study the adult mosquito.
8.what are Tossits and how are they used? - CORRECT ANSWERS--A petroleum based oil pesticide used to **** up larvae. Considered a hazardous material in California! Liquid detergent is now used.
9.Name 2 common natural enemies of the mosquito. - CORRECT ANSWERS--
Gambusia Affinis: Minnow freshwater fish is referred to as the mosquito fish. -The DragonFly: kills larvae and adult mosquitoes.
10.Describe some mosquito control methods. - CORRECT ANSWERS--Pesticides (used as a last resort). -When larvae control has failed these methods can be used: -
Fogging (spray insecticides) misting technique into the air. -Screening, protective clothing; physical barriers. -Repellents: diethyltoluamide (deet) very popular active ingredient. Vit. B12 or garlic or garlic oil. 1.Why is the fly considered the world's filthiest insect? - CORRECT ANSWERS--Due to its tendency to get into garbage, feces, and food.
2. Describe how the fly eats. - CORRECT ANSWERS--flies would regurgitate on the flood, which digests the food and then the fly reabsorbs the juices.
3. What are the 4 stages of development for the fly? - CORRECT ANSWERS--The egg,
the larvae, the pupa, complete metamorphosis.
4. What diseases are commonly associated with flies? - CORRECT ANSWERS--
Typhoid fever, hepatitis, tapeworm, shigella, e.coli, salmonella, hookworm, paratyphoid fever, cysts (amoebiasis), and Onchocerciasis.
5. To what scientific family does the fly belong to? - CORRECT ANSWERS--Diptera family, known for a single pair of wings.
6.The maggot stage is also known as what stage of development? - CORRECT ANSWERS--The larvae stage.
7. How do biting and not-biting flies differ? - CORRECT ANSWERS--The biting variety which include the horse fly, deer fly, stable or flesh fly, black fly and the sand fly. -The non-biting variety is also known as the domestic or synanthropic flies. Example house fly.
8. Where do most pupa go to develop? - CORRECT ANSWERS--Warm, moist organic material is the perfect breeding media; Manure!
11. Where are face flies usually found? - CORRECT ANSWERS--cooler climates such as attics or other cool places.
12. What does the biting stable fly have that the domestic house fly does not? - CORRECT ANSWERS--Possesses a proboscis. Has mouth parts which bite and usually bite very hard.
13. What fly was used during the civil war to clean out a war wound? - CORRECT ANSWERS--The flesh flies!
14. Why are blow flies attracted to mercaptan or garbage? - CORRECT ANSWERS--
They're attracted to the mercaptan or garbage because of the release of sulfuric compounds that simulate the odor of decomposing flesh.
15. What are the primary differences between the blackflies and deer flies? - CORRECT
ANSWERS--Black flies can lay eggs in free flowing water. They transmit onchocerciasis
(river blindness), and the bite is usually painless. -Deer flies spread tularemia, bites are vicious biters, and found on the Atlantic coast.
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