Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Thermal pollution of water bodies is due to

  1. Discharge of heat (hot water) from power plants

  2. Discharge of chemicals from industries

  3. Discharge of waste from mining

  4. Discharge of agricultural run off
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermal pollution refers to effluents and hot water from thermal plants or atomic reactors which bring about the rise in water temperature. Warm water contains less oxygen, resulting in increased organic loading, and replacement of green algae by blue-green algae.

So, the correct answer is option A.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

One of the best solutions to manage non-biodegradable wastes is

  1. Burning

  2. Dumping

  3. Burying

  4. Recycling
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • There are wastes that are generated on an everyday level, classified as non-biodegradable wastes because they cannot be degraded by microbial activity.
  • These wastes cannot be burned because they release harmful gases and result in air pollution. 
  • Dumping and burying of this wastes may cause leaching of the chemicals which causes soil pollution. 
  • Recycling is the best way to manage these waste forms. 
  • Recycling will help in the reduction of the wastes and the waste will be transformed into useful forms.
  • Thus, the correct answer is option D. 
Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

.......... of water on earth is pure water and .......... of water is consumed for industrial purpose.

  1. 10%, 2% of pure water

  2. 3%, 5-10% of pure water

  3. 5%, 3-5% of pure water

  4. 40%, 10% of pure water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

About 71% of the Earth's surface is covered by water. There is only 3% of water which is considered as pure or fresh water. This water is present in lakes and rivers. This pure water is used for various different activities. It is also known as potable water. About 5-10% of pure water is used for the industrial purposes.

Thus, the correct answer is option B. 

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Most abundant water pollutant is

  1. Detergents

  2. Pesticides

  3. Industrial wastes

  4. Ammonia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Industrial effluents are the major water pollutants because of their ingredients. Heavy metal waste like mercury, cadmium, dirt and gravel, masonry and concrete, scrap metal, trash, oil, solvents and chemicals etc. are present in the industrial effluents. Their treatment is a long and expensive procedure as compared to domestic sewage treatment. The industrial waste is corrosive, reactive and igniting. It poses dangerous effects on the aquatic life primarily and human health thereafter. These have shown the biomagnification capability as well.

Hence, the correct answer is 'Industrial wastes'.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Which one of the following impurities is easiest to remove from wastewater ?

  1. Bacteria

  2. Colloids

  3. Dissolved solids

  4. Suspended solids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Suspended solids in water refer to various impurities like sand, slit, small stones, etc. These are heavy ad get submerged at the bottom of water. They do not easily mix or dissolved easily with water. So, they can be separated from water by various means like sedimentation, water filter, etc. 
  • Bacteria are very minute organisms that are not even visible to naked eyes and thus their removal becomes very difficult. Proper disinfection is required to remove them. 
  • Colloids and other suspended impurities also need special filtration and purification techniques to be separated from the water.
  • So, option D is the correct answer.
Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Water pollution is due to

  1. Agricultural discharge

  2. Sewage and other wastes

  3. Industrial effluents

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Agricultural discharge such as large quantity of agrochemicals, organic matter, sediments and saline drainage, fertilizer extract directly released in water bodies contaminate water and cause waterlogging. Sewage and untreated waste containing the high amount of organic compound and industrial effluent including organic, non-organic and reactive waste released in water have the potential to acidify water bodies, the solid waste accumulation can result in drying up of waters.

Hence, the correct answer is 'All of the above'

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

With rise of water temperature, dissolved oxygen

  1. Remains unchanged

  2. Increases in amount

  3. Decrease in amount

  4. Is more available to aquatic organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen is less soluble in warm water. Hence, as the water temperature increases the dissolved oxygen decreases.

So, the correct answer is 'Decrease in amount'.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Itai-Itai is found to be caused due to _____

  1. Cadmium

  2. Silicon

  3. Mercury

  4. Arsenic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cadmium (Cd) is one of the most toxic elements to which humans could be exposed at work or in the environment. The outbreak of itai-itai disease, which is the most severe stage of chronic Cd poisoning, occurred in the Cd-polluted Jinzu River basin in Toyama.