Tag: mosquitoes and malaria

Questions Related to mosquitoes and malaria

Pupa occurs in the life cycle of

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Cockroach

  2. Housefly

  3. Honey Bee

  4. Earthworm.

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Correct Option: B
Explanation:
  • The pupal stage occurs only in holometabolic insects i.e those that undergo a complete metamorphosis, going through four life stages; egg, larva, pupa, and imago(adult). For example, Housefly, Beetle, Butterfly, moths, wasps, etc.
  • During the time of pupation, that the adult structures of the insect are formed whilst the larval structures are broken down.
  • Hence Pupa occurs in the life cycle of Housefly.
  • So, the correct answer is 'Housefly',

Common House Fly (Musca nebulo) lays eggs on

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Cow/Horse dung

  2. Stagnant water

  3. Hanging ropes

  4. Open meats and sweets.

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Correct Option: A
Explanation:
  • The female housefly usually mates only once and stores the sperm for later use. She lays batches of about 100 eggs on decaying organic matter such as food waste, carrion, or feces.
  • House fly eggs are laid in almost any warm, moist material that will supply suitable food for the larvae. For example, Cow/Horse dung.
  • Hence Common House Fly (Musca nebulo) lays eggs on Cow/Horse dung.
  • So, the correct answer is 'Cow/Horse dung.

Immature stage of housefly is

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Caterpillar

  2. Nymph

  3. Grub

  4. Maggot.

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Correct Option: D
Explanation:
  • Metamorphosis is defined as the series of changes that occur during the development of adult(mature stage) from the larva(immature stage). The order of metamorphosis in Housefly is Egg, larva or maggot, pupa, and adult.
  • The female housefly usually mates only once and stores the sperm for later use. She lays batches of about 100 eggs on decaying organic matter such as food waste, carrion, or faeces. They hatch after about 12 hours and the larvae, or maggots(immature stage), feed on the rotting organic material. A maggot passes through three larval stages and then forms a pupa or cocoon. The adult fly emerges from the cocoon. Houseflies typically develop from egg to adult(mature stage) within 10 days.
  • Hence Immature stage of a housefly is Maggot(larva).
  • So, the correct answer is 'Maggot'.

Maggot of Housefly is

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Pupa

  2. Larva

  3. Chrysalis

  4. Imago.

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Correct Option: B
Explanation:
  • Metamorphosis is defined as the series of changes that occur during the development of adult from the larva. The order of metamorphosis in Housefly is Egg, larva or maggot, pupa, and adult.
  • The female housefly usually mates only once and stores the sperm for later use. She lays batches of about 100 eggs on decaying organic matter such as food waste, carrion, or faeces. These soon hatch into legless white mature larvae, known as maggots.
  • Hence Maggot of Housefly is larva.
  • So, the correct answer is 'Larva'.

The order of metamorphosis in Housefly is

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Egg, nymph, pupa and adult

  2. Egg, larva, nymph and adult

  3. Egg, larva, pupa and adult

  4. Egg, pupa, larva and adult.

Show answer
Correct Option: C
Explanation:
  • Metamorphosis is defined as the series of changes that occur during the development of adult from the larva.
  • The order of metamorphosis in Housefly is Egg, larva, pupa, and adult.
  • So, the correct answer is 'Egg, larva, pupa, and adult'.

Houseflies act as a ___________ source for birds.

biology hygiene - a key to healthy life mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

  1. Protein

  2. Carbon

  3. Mineral

  4. None of the above

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Correct Option: A
Explanation:

Houseflies are generally found feeding and breeding on trash and rotten food where they get attached to several pathogens which are further transmitted by these flies to a healthy host. Housefly pupae contain large amounts of protein and are thus especially beneficial to the various birds, reptiles, and insects that prey on them. 

So, the correct answer is option A.

When domestic sewage mixes with river water

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  1. Small animals like rats will die after drinking river - water

  2. The increased microbial. activity releases micronutrients such as iron

  3. The increased microbial activity uses up dissolved oxygen

  4. The river water is still suitable for drinking as impurities are only about 0.1%

Show answer
Correct Option: A
Explanation:

BOD (biochemical oxygen demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria. The BOD test measures the rate of update of oxygen by microorganisms in a sample of water and thus, indirectly BOD is the measure of the organic matter present in the water. The greater the BOD of wastewater more is its polluting potential. 

So, the correct answer is 'Small animals like rats will die after drinking river - water'.

Larger amount of dissolved oxygen in water, faster will be

evs contaminated water spreads disease mosquitoes and malaria diseases caused by mosquitoes water borne diseases

  1. Turbidity

  2. Reaeration

  3. Self Purification

  4. Currents

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Correct Option: C

Match the following items in column I with column II and choose the correct answer

 Column I  Column II
 A. Arsenic  1. Minamata disease
 B. Nitrate  2. Itai-itai
 C. Mecury  3. Blue-baby syndrome
 D. Cadmium  4. Skeletal fluorosis
 E. Fluoride  5. Black-foot disease

evs contaminated water spreads disease mosquitoes and malaria diseases caused by mosquitoes water borne diseases

  1. A-2, B-3, C-5, D-1, E-4

  2. A-5, B-3, C-1, D-2, E-4

  3. A-3, B-4, C-5, D-1, E-2

  4. A-5, B-4, C-3, D-2, E-1

  5. A-2, B-5, C-4, D-3, E-1

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Correct Option: B
Explanation:

Minamata disease is caused by mercury poisoning. It results in numbness, muscles weakness, loss of hearing, speech and reduces vision. 

Itai- Itai is the disease caused by cadmium poisoning. The victim feels pain in spines and joints. 
The blue baby syndrome also called as methemoglobinemia. It results in the mixing of deoxygenated and oxygenated blood due to non-closer of foramen ovale of heart. It results due high quantity of nitrate in water. 
Black foot disease is caused by consumption of contaminated water having a high quantity of arsenic. 
Skeletal fluorosis is a bone and joint disease caused by prolonged exposer to fluoride. Thus, the correct answer is option B.

Black-foot disease is caused due to groundwater contaminated with the excess amount of

evs contaminated water spreads disease mosquitoes and malaria diseases caused by mosquitoes water borne diseases

  1. Nitrate

  2. Fluoride

  3. Arsenic

  4. Sulphur

  5. Mercury

Show answer
Correct Option: C
Explanation:

Arsenic comes from bedrock as well as surface leaching. Chronic exposure leads to repeated diarrhoea, peripheral neuritis, hyperkeratosis, transverse striations on fingernails, peripheral vascular insufficiency, vasospasm, hyperpigmentation leading to 'Black Foot Disease', lung inflammation, skin and lung cancer.