In this post, you will learn about activity 7.1 NCERT class 10 science Control and Coordination which belongs to chapter 7 NCERT solutions. You can also go through activity 7.2 class 10 science Control and Coordination.
Chapter 7 - Control and Coordination Activity -7.1
Activity - Put
some sugar in your mouth. How does it taste? Block your nose by pressing it
between your thumb and index finger. Now eat sugar again. Is there any
difference in its taste?
While
eating lunch. block your nose in the same way and notice if you can fully
appreciate the taste of food are eating.
Observations:
(i)
When sugar is eaten it tastes sweet.
(ii)
When the nose is blocked before putting the
sugar in the mouth. no difference in its taste is observed.
(iii) When the lunch box is opened and the nose has blocked the taste of the food is not fully appreciated.
Explanation:
Chemical
receptors of our body that perceive the taste stimulus are called gustato
receptors. The gustato receptors are present on our tongue. when they are
stimulated by chemicals they convey the information of special taste sensory
area of the brain. In brain, the information is interpreted and we come to know
about the taste of the food. When sugar is eaten we feel the taste of sugar.
In
the next part of the activity, we feel
the taste of the sugar even after blocking our nose. It is because the fact
that taste of sugar is not affected by receptors of smell situated in the nose.
Generally, as soon as we open our lunch box, the smell of food is detected by the
olfactory receptors of our nose. Our mouth starts some salivation before the
food reaches our mouth. When we eat food its chemicals spread in a larger area
of the tongue. Because of the presence of saliva in our mouth. Actually, the taste is a
function of both gustatoreceptors and olfactoreceptros. Taste is often enhanced
by receptors of smell, especially the taste of hot aromatic substances. It
means taste perception is helped by receptors of smell also. Salivation
enhances the taste of food. Hot food tastes better. If the nose is blocked by the thumb and index finger, we partially appreciate the taste of food. The part or
components of food which can be felt by taste receptors only are appreciated.
But the taste is not fully appreciated.
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