<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Graad 8

Omgewing en interaksies

Module 33

Verskillende ekosisteme

Ons land is ryk aan wyduiteenlopende soorte ekosisteme.

Jou onderwyser sal julle waar moontlik na een of meer van hierdie ekosisteme neem.

Aktiwiteit 1:

Om die nut van ’n grasveld-ekosisteem te bespreek

[lu 1.3]

In groot dele van ons land vorm gras die grootste deel van die ekosisteme. Ons kan ook die term BIOOM gebruik om na die dele van ’n land wat min of meer dieselfde ekologiese kenmerke toon, te verwys. So kry ons byvoorbeeld ’n grasveldbioom. ’n Grasveldbioom kan as ’n groot ekosisteem beskryf word of dit kan in kleiner grasveld-ekosisteme verdeel word.

Kennis van die grasveldbioom en -ekosisteme is belangrik in Suid-Afrika, aangesien groot dele van die land vir veebeweiding benut word.

Wildsboksoorte soos impala, buffels en springbokke is ook grasvreters.

Die tipe gras in ’n ekosisteem word hoofsaaklik deur die aard van die grond bepaal.

Grasveldbiome word in terme van die dominante grassoort wat daarin voorkom, benoem.

Die hooftipes grasveld-ekosisteme (eintlik biome) is:

1. soetveld – lae reënvalgebiede; goeie voer vir vee;

2. suurveld – hoë reënvalareas; nie baie goeie weiding nie;

3. gemengde veld.

Rooigras Themeda triandra is ’n welbekende grassoort wat baie voedsaam is vir vee.

Oorbeweiding is die boer se grootste oortreding, want dit lei op sy beurt tot erosie, woestynvorming en gevolglik hongersnood.

Voer ’n klasdebat oor die volgende vraag:

  • Is die gereelde brand van gras goed of sleg vir die omgewing?
  • Dui die voor- en nadele soos wat dit uit die debat voortspruit in die kolom hieronder aan.
VOORDELE VAN BRAND NADELE VAN BRAND
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................

Assessering van DEBAT:

Het jy ’n waardevolle bydrae tot debat gelewer?

[LU 1.3]

Aktiwiteit 2:

Om ’n woud/boomekosisteem te bespreek

[lu 1.2; 1.3; 2.4]

Bome is nie net produseerders nie, maar vorm as gevolg van hul grootte ook die habitat van verskeie spesies.

Dier- en plantspesies bewoon bome.

Die blaarbedekking van bome verskaf skuiling vir voëls. Die bas en skeure in die boom verskaf ’n habitat vir ’n menigte insekspesies. Die blaarbedekking vorm ook ’n skaduryke omgewing vir skaduliewende, laaggroeiende plante.

Die blomme en vrugte wat bome in sommige gevalle voortbring, is ’n kosbron vir baie.

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, Natuurwetenskappe graad 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 8' conversation and receive update notifications?

Ask