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NATUURWETENSKAPPE

Ekosisteem en omgewingsbalans

Opvoeders afdeling

Memorandum

Opdrag 15:

1 Plante en diere gaan dood

2 Plante en diere produseer afvalmateriaal

3 Ontbinders breek die afvalmateriaal af en gebruik sommige dele as voedsel

4 Ander dele word afgebreek as chemikalieë en weer vrygestel in die lug of grond

5 Die chemikalieë word weer deur ander plante geabsorbeer en opgeneem in voedselketting.

LEERKRAG AFDELING

Inhoud

Aktiwiteit: om die belangrike rol wat plante in die ekosisteem vervul, te bestudeer [lu 1.2, lu 2.3]

Plante (produseerders) gebruik eenvoudig nie-lewende materiaal (water, sonlig, kooldioksied en minerale) om hul eie voedsel te vervaardig. Die proses word fotosintese genoem, maar jy sal meer daarvan in die volgende module leer. Suurstof word terselfdertyd vrygestel.

Ontwerp nog twee voedselkettings met plante as die produseerders.

(a) Die rol van swamme in die ekosisteem

Swamme staan bekend as die “arm” familie van die planteryk omdat hulle geen groen kleurstof bevat nie. Die groen kleurstof, chlorofil, stel groen plante in staat om self kos te vervaardig uit koolsuurgas en water. Groen plante staan dus op hulle eie voete en is van geen ander lewende wese afhanklik vir kos nie. Swamme en bakterieë, daarenteen, is dus net so afhanklik soos diere van die kos wat groen plante vir hulle moet berei.

Wanneer ‘n plant of ‘n dier doodgaan, gaan die opgebergde energie nie verlore nie. Mikroskopiese swamme en bakterieë teer op hul liggame en breek dit in die proses af. Sodoende word dit weer deel van die grond. Hierdie plante word ontbinders genoem, weens hulle unieke rol in die natuur.

Opdrag 15

Bestudeer die volgende diagrammatiese voorstelling oor die ontbindingsproses. Dit demonstreer hoe dooie organismes afgebreek en deur ontbinders hersirkuleer word. Gebruik nou die byskrifte wat volg en skryf hulle op die korrekte plekke in. Die byskrifte is nie in volgorde nie:

  • Plante en diere produseer afvalmateriaal, bv. blare.
  • Ontbinders breek die afvalmateriaal af en gebruik sommige dele as voedsel.
  • Ander dele word afgebreek as chemikalieë en weer vrygestel in die lug of grond.
  • Plante en diere gaan dood.
  • Die chemikalieë word weer deur ander plante geabsorbeer en weer opgeneem in die voedselketting.

(i) Struktuur van die Swamplant

Die swamplant self bestaan uit vertakte drade wat soms in vakkies verdeel is, bv. broodskimmel, of soms saamgevleg is tot ‘n groot, vaste liggaam, bv. sampioene. Baie swamme is eetbaar, maar daar is ook soorte wat uiters giftig is. Dit is veiliger om maar net die welbekende sampioene te eet. Die sampioen word as ‘n klein, ronde wit knopie deur die grond opgestoot. Dit word groter en rek uit op ‘n steel en gaan uiteindelik oop soos ‘n sambreel.

Onder die sambreel straal die sporeplaatjies in ‘n kring om die steel uit. In regte sampioene is die sporeplaatjies rooskleurig as hulle jonk is en swartbruin as hulle volwasse is. Geeneen van die giftige paddastoele het hierdie kleur nie, dus is die kleur die beste aanduiding of dit ‘n giftige paddastoel of ‘n eetbare sampioen is. ‘n Mens moet nooit ‘n paddastoel eet wat baie na ‘n sampioen lyk, maar wit plaatjies het nie, want dit kan mens se dood veroorsaak.

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
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Source:  OpenStax, Natuurwetenskappe graad 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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