1. Home
  2. Natural sciences grade 9
  3. Term 1
  4. Growth

1.8 Growth

<< Chapter < Page
  Natural sciences grade 9   Page 1 / 1
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

differentiate between demand and supply giving examples
Lambiv Reply
differentiated between demand and supply using examples
Lambiv
what is labour ?
Lambiv
how will I do?
Venny Reply
how is the graph works?I don't fully understand
Rezat Reply
information
Eliyee
devaluation
Eliyee
t
WARKISA
hi guys good evening to all
Lambiv
multiple choice question
Aster Reply
appreciation
Eliyee
explain perfect market
Lindiwe Reply
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
What is ceteris paribus?
Shukri Reply
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
yes,thank you
Shukri
Can I ask you other question?
Shukri
what is monopoly mean?
Habtamu Reply
What is different between quantity demand and demand?
Shukri Reply
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
ok
Shukri
how do you save a country economic situation when it's falling apart
Lilia Reply
what is the difference between economic growth and development
Fiker Reply
Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
Abdisa Reply
any question about economics?
Awais Reply
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
Feyisa Reply
Answer
Feyisa
c
Jabir
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
Gsbwnw Reply
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
types of unemployment
Yomi Reply
What is the difference between perfect competition and monopolistic competition?
Mohammed
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply
<< Chapter < Page Page > Chapter >>

Read also:

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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