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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

what is variations in raman spectra for nanomaterials
Jyoti Reply
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
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
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
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 did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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