Tag: basics of water pollution

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Multiple choice biology food components and nutrition water as nutrient basics of water pollution sources of water

Water has 

  1. High surface tension and low thermal conductivity.

  2. Low surface tension and low thermal conductivity.

  3. High surface tension and high thermal conductivity.

  4. Low surface tension and high thermal conductivity.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is unique because it possesses both high surface tension (due to hydrogen bonding) and high thermal conductivity compared to many other common liquids.

Multiple choice biology food components and nutrition water as nutrient basics of water pollution sources of water

Hydrogen bonds amongst water molecules have bestowed the property of 

  1. Liquid with ability to flow.

  2. High velocity, high specific heat and high heat of vaporisation.

  3. High boiling point and low freezing point.

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

Hydrogen bonds in water contribute to high specific heat, high heat of vaporization, high boiling point, and low freezing point, all of which are essential for biological life.

Multiple choice biology food components and nutrition water as nutrient basics of water pollution sources of water

In a living systems, water is involved as a chemical in

  1. Photosynthesis and repiration

  2. Synthesis of polymers

  3. Hydrosis of biochemicals

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

Water is a reactant in photosynthesis, a product in respiration, a reactant in hydrolysis (breaking down polymers), and involved in the synthesis of polymers (dehydration synthesis).

Multiple choice biology food components and nutrition water as nutrient basics of water pollution sources of water

Living cell contains $60 - 75$% water. Water present in human body is

  1. $60 - 65$%
  2. $50 - 55$%
  3. $75 - 80$%
  4. $65 - 70$%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Our cells are made of 60-75% water, hence most of the enzymes and protein molecules, our genetic material, all are water soluble and are evolved in a way to co-exist in water surrounding environment. Thus our proteins are folded in a way where the hydrophobic amino acid residues are folded inside the protein and hydrophilic residues face the hydrated outer environment. Similarly our DNA, RNA are all water soluble. Since the structural and functional unit of our body, consists of 60-75% of water hence, the entire human body is expected to have similar water content.
So, the correct answer is '65−70%'.
Multiple choice biology food components and nutrition water as nutrient basics of water pollution sources of water

When a litre of water is introduced in human blood, 

  1. BMR decreases

  2. RBCs collapse and urine production increases

  3. BMR increases

  4. RBCs collapse and urine production decreases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Introducing a large volume of water into the blood decreases its osmolarity. This causes water to move into red blood cells (osmosis), potentially causing them to swell and burst (hemolysis), and triggers the kidneys to increase urine production to restore balance.

Multiple choice evs sources of water water as nutrient basics of water pollution nutrients and deficiency

The pipes which carry the waste waters from the houses is known as

  1. Waste lines

  2. Drainage lines

  3. Water lines

  4. Wastewater lines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Drainage lines are artificial passageway used to carry the waste water from the houses. It then carries the waste water to the municipal sewage system where it is treated before discharging in water body. Water lines are artificial passageway used to carry the water to the houses.  

Thus, the correct answer is option B.