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Natural sciences

Grade 4

Life and way of living

Module 5

The senses of smell and taste

Activity: To learn more about the senses of smell and taste [LO 2.1]

When you eat, the tongue tastes the taste of the food and your nose smells the flavour. This is how it works:

The openings of your mouth and nose come together in your throat, behind your mouth. The flavours of the food that you eat go to your nose from the back of your mouth. From there, nerves take a message to the brain and the brain tells you what you smell.

The tongue is rough and covered in taste buds to determine different tastes. Write down what the four tastes are that your tongue can identify:

Now pinch your nostrils together with your fingers to close your nose and drink some tea or cooldrink. Why is the taste different?

What have you noticed when you eat while you have a cold?

The sense of smell is very important in the animal world.

Write a proper sentence to say something about the sense of smell of each of the following animals.

Skunk:

Jackal:

Dog:

Antelope:

Rhinoceros:

Hoopoe:

Think of other ways in which animals are able to protect themselves because of their sense of smell.

Try this: Ask someone to mark a route with vanilla or vinegar, without you seeing it. Then try to follow the route by depending on your sense of smell!

Assessment

LEARNING OUTCOME 2: CONSTRUCTING SCIENCE KNOWLEDGEThe learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

ASSESSMENT STANDARD 2.1: The learner is able to recall significant information.

Memorandum

a. sweet

b. salty

c. bitter

d. sour

When the nostrils are pinched together, scents cannot enter the nose, so you will only distinguish sweet, sour, salty and bitter.

In the case of a cold: the same as above.

The sense of smell in the animal world.

Skunk: Protects itself by spraying a strong smelling / pungent secretion in the direction of the enemy.

Jackal: Depends on its sense of smell when hunting. It also has scent glands that secrete scent as it goes along and helps it to find the way on its return.

Dog: Smells very well. Because of their well-developed sense of smell, dogs are used to sniff out drugs, explosives and even people in crowds. They also use their sense of smell when they are hunting.

Antelope: Uses its sense of smell to stay out of danger. If they smell an enemy, antelopes run off very quickly.

Rhinoceros: They also have scent glands underneath their feet to leave messages for other rhinoceroses.

Hoopoe: Birds usually keep their nests very clean, but not the hoopoe. Part of its defence mechanism is to not clean the nest so that the smell will keep predators away.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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