Question

8thA
1. Read the passage and answer the
questions
Man does not live by food alone. Water is vital to human health and fitnes. Although it is not
a nutrient per se as are carbohydrates, fats, proteins, vitamins 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 wate in a man weighing 70
kilograms is approximately a little over 40 liters. It is an excellent solvent - more substances
are soluble in water than in any other liquid lonown 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, wata 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
litar or so the first thing in the moming is kidney-friendly. The water regulation in the body is
affected by hypothalamus in two ways i.e. O by creating the sensation of thirst which makes
us drink water and (ü) by controlling the excretion of water and urine. If water regulation
fais, medical emergency ensues.
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Answer 1

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