Tag: biology

Questions Related to biology

Storing water to make it available even after the rainy season is called

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  1. storage

  2. water management

  3. water purification

  4. none of the above

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Correct Option: B

Waste water from industries contain

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  1. microbes

  2. poisonous substances

  3. oil

  4. minerals

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Correct Option: B

When water is passed through filter beds of sand and gravel to remove smaller particles of dust is called

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  1. oxygenation

  2. chlorination

  3. sedimentation

  4. filtration

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Correct Option: D

Water pollution is mainly caused by

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  1. earthquake

  2. human activity

  3. forest fire

  4. biological decay

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Correct Option: B

Disease caused by the use of untreated water is

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  1. Tuberculosis

  2. Typhoid

  3. Cholera

  4. Both B and C

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Correct Option: D
Explanation:
Tuberculosis is caused due to Mycobacterium tuberculosis. It is caused due to the infection of lungs due to inhaling the contaminated air.
Typhoid is mainly caused due to bacteria Salmonella typhimurium. The intestine and bloodstream of humans is the main source of proliferation of bacteria. The direct contact with the untreated water containing the feces of an infected person is the main cause of the spread of the disease. 
Cholera is a disease which causes severe dehydration due to infection of the bacterium called Vibrio cholerae. Consumption of contaminated food and water mainly causes the disease. 
So, the correct answer is option D.

Which of the following chemical is used to disinfect water

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  1. Chlorine

  2. washing soda

  3. coal

  4. petrol

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Correct Option: A

Which of the following need to be done before chemical treatment and biological treatment?

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  1. Screening only

  2. Filteration only

  3. Boiling of water

  4. Both A and B

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Correct Option: D

water pollution can cause 

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  1. climate change

  2. deforestation

  3. diseases

  4. none of the above

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Correct Option: C

In a filtration plant, water is filtered using layers of 

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  1. sand

  2. oil

  3. sand and clay

  4. sand, fine gravel and medium gravel

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Correct Option: D

Water before treatment contains

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  1. Nitrogen

  2. Oxygen

  3. Phosphorus

  4. Both A and C

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Correct Option: D