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Aktiwiteit 2:

Om maniere te ondersoek wat die uitputting van hout as hulpbron sal verminder

[lu 3.3]

1. Stel ‘n alternatiewe materiaal voor waaruit elk van die volgende produkte vervaardig kan word:

  • Kurkproppe (boombas)
  • Rayonmateriaal
  • Houtplanke vir die maak van meubels
  • Houtsaagsels
  • Papier
  • Dwarslêers (spoor)
  • Houtkissies (vrugte)
  • Potlode

2. Watter funksies wat deur bome (woude) as ‘n lewensonderhoudende stelsel verrig word, kan deur niks anders verrig word nie? (Sien par. 1)

Aktiwiteit 3:

Om die belangrikste woudstreke op ‘n kaart aan te dui

[lu 1,1]

  • Raadpleeg ‘n atlas om die belangrikste woudstreke in die RSA aan te dui.

Indringerspesies

  • Suid-Afrika se natuurlike omgewing is reeds deur meer as 100 spesies vreemde fauna en flora binnegedring. Dit het aanleiding gegee tot wydverspreide ekologiese skade en verliese van etlike miljarde rande ten opsigte van verlore landboupotensiaal en ander grondgebruike. Boonop is die uitroei van indringerspesies ‘n duur en tydrowende proses.
  • Die indringerplante wat die afgelope dekades die vinnigste versprei het en reeds honderde duisende hektaar ingeneem het, sluit in hakea , Australiese Acacias , die Mauritius-doring, paraffienbos, lantana, waterlelie, nasella-graspol, verskeie dennespesies en die litjieskaktus.
  • Vreemde visspesies soos forelle en babers het ook reeds sommige rivierstelsels se inheemse vis verdring, terwyl eksotiese voëlsoorte soos Europese spreeus en Indiese myna-voëls ‘n oorlas in stedelike en moontlik in landelike gebiede is. Hul presies getalle is egter nie bekend nie. Uitheemse rotte en muise is probleemdiere in menslike nedersettings, terwyl die Argentynse mier Suid-Afrika se fynbos bedreig deurdat hy die saadverspreidende inheemse mier verdring.
  • Suid-Afrika se kosbare waterbronne word ook swaar getref deur indringerplante. Oewerhabitats is veral kwesbaar vir indringing en die bo- en middellope van talle riviere is byna heeltemal toegegroei deur digte plate silwer en swart wattelbome ( Acacia -spesies).
  • In fynbosgebiede het digte plate indringerplante die waterbalans van bergopvanggebiede versteur en skep indringers ‘n baie groter brandgevaar as die natuurlike plantegroei.
  • Al sewe die belangrikste biosfere word deur indringerplante bedreig en fynbos, savanna en woudgebiede word die swaarste getref. Tot dusver is pogings om indringerplante in die subkontinent se formele bewaringsgebiede in bedwang te bring, met wisselende sukses toegespits op indringerbome en -struike. Indringing deur onkruid en grasse word meestal oor die hoof gesien en weinig ekologiese inligting is beskikbaar oor hierdie probleem.

Aktiwiteit 4:

Om navorsing oor indringerspesies te doen en daaroor te skryf

[lu 1.2]

Om indringerspesies uit te roei, is ‘n duur en tydrowende proses.

1. Skryf kort aantekeninge oor een indringerplant en een indringerdier wat in julle omgewing voorkom.

a) Indringerplant

b) Indringerdier

Enkele voorbeelde van indringerplante

Litjieskaktus

Besmetting deur litjieskaktus belemmer boerderybedrywighede en veroorsaak dat die waarde van besmette grond verminder.

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, Aardrykskunde graad 8. OpenStax CNX. Sep 11, 2009 Download for free at http://cnx.org/content/col11035/1.1
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