EADING [20 Marks]
Q1. Read the passage given below. [10 Marks]
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, vitamins and minerals. It, in fact, is a key nutrient
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 body’s temperature. Water
accomplishes this role ideally because it has high thermal conductivity ensuring rapid heat transfer
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 as urine.
If water regulation fails, medical emergency ensues.
On the basis of your understanding of the passage, answer ANY TEN questions from the twelve
that follow. [1 X 10 = 10 Marks]
(a) Water is vital to human health and fitness because:
(i) man does not live by food alone
(ii) it is an excellent solvent
(iii)we cannot survive for more than a couple of days without it
(iv)it controls thirst and excretion of water as urine
(b) Water is called a key nutrient because:
(i) it dissolves different products of digestion
(ii) no life is possible without it
(iii)it carries products to the rest of the body
(iv)it raises temperature of the body
(c) Water is an ideal constituent of the body fluids because:
(i) it is an excellent solvent (ii) it dissolves metabolic wastes
(iii) it drains wastes out of the body (iv) it regulates excretion of urine
(d) Water regulates body temperature efficiently as:
(i) it circulates easily (ii) it has high-specific heat
(iii) it dissolves food easily (iv) it has high thermal conductivity
(e) What does the author means when he uses the word ‘regulation’ in the last para?
(i) Official rule (ii) Control
(iii) Device for fair use (iv) Worn or used as per rules
Answers
Answered by
26
Answer:
(a) (iii) we cannot survive for more than a couple of days without it.
(b) (ii) no life is possible without it.
(c) (ii) it dissolves metabolic wastes.
(d) (iv) it has high thermal conductivity.
(e) (ii) Control
Answered by
14
Answers to the given questions is as follows:
(a) Water is vital to human health and fitness because:
(i) man does not live by food alone.
(b) Water is called a key nutrient because:
(ii) no life is possible without it.
(c) Water is an ideal constituent of the body fluids because:
(i) it is an excellent solvent.
(d) Water regulates body temperature efficiently as:
(iv) it has high thermal conductivity.
(e) What does the author means when he uses the word ‘regulation’ in the last para?
(ii) control.
Thus, answers to the given questions is as above.
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