WATER : LIFE’S MAIN SOURCE

Man does not live by food alone. Water is vital to human health and fitness. Although it is not a nutrient per se as are carbohydrates, fats, proteins, vitains and minerals. It, in fact, is a key nutrient in as much as no life is possible without it. Whereas we can do for weeks without food, we cannot live without water longer than a couple of days. Water approximates 60 per cent of the body weight of human adults. The total amount of water in a man weighing 70 kilograms is approximately a little over 40 litres. It is an excellent solvent – more substances are soluble in water than in any other liquid known so far. This makes it an ideal constituent of the body fluids which sustain life supporting chemical reactions. It dissolves varied products of digestion and transports them to the rest of the body. Likewise, it dissolves diverse metabolic wastes and helps drain them out of the body. Besides, it performs a variety of functions – some well-known and well understood while others not so well appreciated yet vital. The no less important role of water is to distribute/dissipate the body heat efficiently, thereby regulating the body’s temperature. Water accomplishes this role ideally because it has thermal conductivity ensuring rapid heat from one part to the other. Above all, water has a high-specific heat, implying that it takes a lot of heat to raise the temperature of water and likewise much heat must be lost to lower its temperature. Drinking a lot of water is an inexpensive way to stay healthy. Even excess of water is harmless. Water therapy-drinking a litre or so the first thing in the morning is kidney-friendly. The water regulation in the body is affected by hypothalamus in two ways i.e. (i) by creating the sensation of thirst which makes us drink water and (ii) by controlling the excretion of water and urine. If water regulation fails, medical emergency ensues.

Supplimentary Paper 2019 next 2

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Question 1

Man cannot live for more than a couple of days –

A
without food
B
without water
C
without sun
D
without fruits
Question 2

Water is an excellent solvent because………….

A
It regulates excretion of urine
B
It dissolves metabolic wastes
C
It drains waste out of body
D
More substances are soluble in it than in any other liquid
Question 3

The high thermal conductivity of water helps to……..

A
Dissolve food
B
dissolve metabolic wastes
C
regulates body temperature
D
sustain life supporting chemical reactions
Question 4

The total amount of water in a man weighing 70 kg is………..

A
Approx 70 litres
B
Approx 60 litres
C
Approx 40 litres
D
Approx 50 litres
Question 5

High specific heat of water means……….

A
It has high thermal conductivity
B
It takes less heat to raise its temperature
C
It takes more heat to raise its temperature
D
It distributes the body heat efficiently
Question 6

Drinking a litre of water in the morning is called……….

A
Hypothalamus
B
Water regulation
C
Kidney therapy
D
Water therapy
Question 7

What is vital to human health ?

A
food
B
nutrient
C
fruits
D
water
Question 8

What is an inexpensive way to stay healthy ?

A
eat lots of food
B
drink fruit juices
C
drink a lot of water
D
eat lots of fruits
Question 9

What does solvent mean ?

A
able to dissolve
B
able to drink
C
able to think
D
able to solve
Question 10

When does medical emergency ensue ?

A
water temperature rises
B
water regulation fails
C
water chemical rises
D
all is well
Question 11

What is another thing needed by man for survival other than water ?

A
food
B
fruits
C
trees
D
water
Question 12

What percentage of body weight of adult is water ?

A
Approx. 70
B
Approx. 60
C
Approx. 40
D
Approx. 50
Question 13

The antonym of “excellent”

A
good
B
outstanding
C
inferior
D
perfect
Question 13 Explanation: 
inferior means lower in rank
Question 14

The synonym of ideal 

A
lazy
B
most suitable
C
valuable
D
good
Question 15

Find the correct statement

A
Excess of water is harmful
B
Water is not kidney friendly
C
Water distributes the body heat efficiently
D
Water is not important in life
Question 16

Write the antonym of ‘little’

A
a few
B
excess
C
scanty
D
less
Question 17

In how many ways hypothalamus affects our body?

A
3
B
2
C
4
D
1
Question 18

What does water dissolve in our human body?

A
metabolic wastes
B
water
C
blood
D
air
Question 19

Who has high specific heat?

A
metabolic waste
B
water
C
blood
D
air
Question 20

What is not so well appreciated yet is vital in life?

A
metabolic wastes
B
body heat
C
chemical reaction
D
water
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