<< Chapter < Page Chapter >> Page >

Natural sciences

Grade 9

Life processes: healthy life

Module 9

Growth, development and adolescence

When an organism grows , it shows an increase in mass and size.

An organism develops when its cells and tissues take on different forms and functions.

Beginning as a zygote, the growth of a human shows the following steps:

  • Morula: a solid ball of cells
  • Blastula: a hollow ball of cells beginning to specialise
  • Embryo: first two months
  • Fetus: from two months

Following birth, the child goes through another series of developmental stages:

  • Baby / infant: from birth
  • Toddler: from one to two and a half years
  • Adolescent: from puberty to adulthood
  • Adult: approximately from age 18

Hormones bring about a range of developments:

Boys: TESTOSTERONE

Sexual organs enlarge

Muscles become stronger and larger

Voice deeper – “breaks”

Bodily hair

Girls: ESTROGEN

Sexual organs enlarge

Hips broaden

Hips broaden

Bodily hair

Questions about and Aspects of adolescence: GROUP DISCUSSION

  • Some cultures have an initiation process after which the child is regarded as an adult. A range of rituals and various ceremonies are practised. Find out about this and deal sensitively with the knowledge you gain.
  • Some cultures and beliefs require circumcision – at differing ages. Here, also, the practices of other people have to be considered sensitively.

1. What is circumcision?

2. What is initiation?

3. What is acne? How is it treated?

4. What is peer pressure? How do you deal with it?

Assessment: GROUP DISCUSSION

Are you able to form a clearer picture of people in their communities?

LO 3.1

Assessment

Learning Outcomes 3: Science, society and environment

The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.

We know this when the learner:

3.1 understands science as a human endeavour.

Memorandum

QUESTIONS ABOUT AND ASPECTS OF ADOLESCENCE: GROUP DISCUSSION

1. surgical removal of the foreskin/prepuce of the penis

2. a series of rituals and ceremonies that are practised in some cultures – may include circumcision – male and female

3. skin problems due to abnormal secretion of oils cased by hormones; good basic skin cleansing routine and medicinal creams and preparations

Pressure applied by members of same age group and friends with regard to clothing, behaviour, attitudes and habits; decide for yourself by using sound moral values as a frame of reference; also give consideration to the wisdom and experience elf older persons.

Questions & Answers

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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natural sciences grade 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11069/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 9' conversation and receive update notifications?

Ask