Sensing Around
Watch video based on Environment day 2020
I.
Fill in the blanks.
Fill in the blanks.
1. The sense organs
contain thousands of nerves.
contain thousands of nerves.
2. The nerves
linked with our senses send messages to the brain.
linked with our senses send messages to the brain.
3. A good touch makes us feel comfortable.(good)
4. The deaf and
dumb use sign language to communicate.
dumb use sign language to communicate.
5. The ability to
smell and taste go together.
smell and taste go together.
6. The eyelids protect our eyes.
II.
Sort the jumbled words to match the right sense organ.
Sort the jumbled words to match the right sense organ.
|
smells, sensation of touch,
vibrations, sight, breathes, eyelids, largest sensory organ, nostril, images, taste buds, blink, swallowing, feel pressure, speaking, tears, sound waves, feel hot, helps balance our body, clean our teeth, cleans air we breathe |
1. Eye: Ans:- sight,
eyelids images, blink, tears
eyelids images, blink, tears
2. Ears: Ans: – vibrations,
sound waves
sound waves
3. Tongue: Ans: – taste buds, swallowing, speaking, clean our teeth
4. Nose: Ans: – smells, nostril, cleans air we breathe
5. Skin: Ans: – sensation
of touch, largest sensory organ, feel pressure, feel hot, helps
of touch, largest sensory organ, feel pressure, feel hot, helps
balance
our body
our body
III.
Answer the following questions.
Answer the following questions.
1. How do our sense organs
help us?
help us?
Ans: – Sense organs
help us to feel the world around. They protect us from harm.
help us to feel the world around. They protect us from harm.
2. How does the sense of sight
work?
work?
Ans:- i. sight begins when
light rays bounce off the surface of objects.
light rays bounce off the surface of objects.
ii. The rays enter
the eye and travel to the brain in the form of signal.
the eye and travel to the brain in the form of signal.
iii. The brain
processes these signals to form images, which gives us sight.
processes these signals to form images, which gives us sight.
3. Name the four basic tastes
that the tongue can identify.
that the tongue can identify.
Ans: – Sweet, sour,
salty and bitter are the four basic tastes that the tongue can identify.
salty and bitter are the four basic tastes that the tongue can identify.
4. How do we hear sounds?
Ans:- i. Sound is
created when the object vibrates.
created when the object vibrates.
ii. The inner ear
changes vibrations into messages which are sent to the brain.
changes vibrations into messages which are sent to the brain.
iii. Brain converts
message into sound which we hear.
message into sound which we hear.
5. Why do the police use dogs
to track thieves?
to track thieves?
Ans:- Police use dog
to track the thieves because dog’s sense of smell is thousand times more
sensitive than humans.
to track the thieves because dog’s sense of smell is thousand times more
sensitive than humans.
6. What are the functions of
the nose?
the nose?
Ans: – Following are
the functions of our nose-
the functions of our nose-
·
Nose helps us to breath and smell.
Nose helps us to breath and smell.
·
It helps us to differentiate between the
various smells.
It helps us to differentiate between the
various smells.
·
The nerve endings present in the nose, pick
up smells from the air and sends signals to the brain.
The nerve endings present in the nose, pick
up smells from the air and sends signals to the brain.
·
There are tiny hair in both the nostrils of
our nose. These are to filter the air to some extent when we breathe.
There are tiny hair in both the nostrils of
our nose. These are to filter the air to some extent when we breathe.
7. Name any two ways in which
you can make your school disabled-friendly?
you can make your school disabled-friendly?
Ans:- The two ways
in which we can make our school disabled friendly are-
in which we can make our school disabled friendly are-
i. We should respect
special abilities of differently-abled.
special abilities of differently-abled.
ii. We should be
sensitive to the needs and feeling of differently abled.
sensitive to the needs and feeling of differently abled.
Give
Reasons
Reasons
1.
The sense of touch keeps us safe
The sense of touch keeps us safe
The organ
for the human sense of touch is the skin. It is the largest sense organ since
it covers the entire body. Our sense of touch helps us to respond to different
stimuli such as pain, pressure, tension, temperature, texture, shape, weight,
contours and vibrations. It helps us move away when the brain tells that there
is a danger.
for the human sense of touch is the skin. It is the largest sense organ since
it covers the entire body. Our sense of touch helps us to respond to different
stimuli such as pain, pressure, tension, temperature, texture, shape, weight,
contours and vibrations. It helps us move away when the brain tells that there
is a danger.
2.
The leaks from LPG cylinders can be easily detected
The leaks from LPG cylinders can be easily detected
Ans: The
leakage of LPG is detected easily due to the smell of a substance that you
notice when there is a leak. This substance is called Ethyl Mercaptan. This substance
has a typical smell which (once known) is easily recognised by our sense of
smell.
leakage of LPG is detected easily due to the smell of a substance that you
notice when there is a leak. This substance is called Ethyl Mercaptan. This substance
has a typical smell which (once known) is easily recognised by our sense of
smell.