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Natuurwetenskappe

Graad 8

Omgewing en interaksies

Module 38

Die rol van water in die natuur en as hulpbron

Aktiwiteit 1:

Om die waarde van water en die watersiklus te kan verduidelik

[lu 1.3; 2.3; 2.4]

Ons planeet vertoon blou vanuit die buitenste ruim as gevolg van die water teenwoordig.

Water is onontbeerlik vir lewe op ons planeet. Sonder water sal ekologiese oorlewing nie moontlik wees nie.

Ons planeet is net soos ’n ruimteskip toegerus met ’n sekere kwota water. Dit word nie vanuit die buitenste ruim aangevul nie en moet dus SIRKULEER . So is die WATERSIKLUS ’n uiters belangrike aspek van die natuur. Dit is ook besonder effektief indien die mens dit nie versteur nie.

Die watersiklus

Teken ’n voorstelling van die watersiklus soos wat jy dit verstaan. Gebruik verduidelikende byskrifte. Gebruik die voorstelling hiernaas bladsy as riglyn.

Die volgende tabel verduidelik die hoofstappe in die siklus:

TERM BESKRYWING
Wolkvorming Saampak van waterdruppels in die atmosfeer
Verdamping Water na waterdamp
Presipitasie/ Neerslag Water val na die aarde in die vorm van reën, sneeu, hael, kapok
Kondensasie Waterdamp na waterdruppels
Straling Verhitting deur die son
Transpirasie Plante se blaaroppervlaktes verloor waterdamp deur huidmondjies
Infiltrasie Water sak in die grond in
Afloop Water loop teen grondoppervlaktes na riviere, damme en mere

Assessering van WATERSIKLUSSKETS

Kon jy basiese komponente en definisies GRAFIES voorstel?

[2.3]

El niño, droogtes en vloede

  • Suid-Afrika is ’n waterarm land as jy sy reënvalsyfers met dié van ander lande vergelyk.
  • Slegs van die groter riviere is standhoudend.
  • Verder word ons klimaat en reënvalpatrone deur verskynsels soos El Niño beïnvloed. Dit is ’n wêreldwye weerverskynsel en voorsorgsmaatreëls moet getref word om dit die hoof te kan bied.

1. Vind meer uit oor El Niño en rapporteer terug aan klas. Som jou notas kortliks op.

2. Vind artikels oor droogtes en oorstromings in Suid-Afrika en bring dit klas toe.Ruil julle informasie en artikels met mekaar uit.Maak notas oor die onderwerp.

[LU 1.3]

[LU 2.3]

AKTIWITEIT 2:

Om die waarde van water en die gebruik daarvan in en om die huis te ondersoek

[LU 2.3; 3.2]

Waterverbruik by die huis

Vra jou ouers of voog vir hul munisipale rekeninge:

  • skryf julle huishouding (drie somermaande en drie wintermaande) se waterverbruik vir die ses maande neer.

Somermaande : 1. ......................... 2. ......................... 3. .........................

Wintermaande : 1. ......................... 2. ......................... 3. .........................

  • Dink jy julle waterverbruik is buitensporig?

Waterbesparing by die huis

Hoe kan jou gesin bydra tot waterbesparing? Wat kan JY doen?

  • Maak ’n lys van die beste voorstelle:

Assessering van KLASBESPREKING

Kon jy werkbare voorstelle tot WATERBESPARING maak?

[3.2]

Aktiwiteit 3:

Om die aanpassings van plante en diere t.o.v. watertekort te ondersoek

[lu 1.3; 2.3]

Plante:

  • In ’n vorige module is verwys na plante wat volgens waterbehoeftes in drie groepe geklassifiseer kan word.

Noem die drie groepe met ’n voorbeeld van elk.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Natuurwetenskappe graad 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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