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Graad 9

Plante: van bou tot genetika

Module 27

Plantorgane: wortels

Plante leef en groei onopsigtelik en dikwels is ons totaal onbewus van die wonders wat in hulle versteek is. Om die wonder van hulle werking te kan verstaan, moet ons hulle van naderby bekyk.

‘n Plant bestaan basies uit vier soorte organe: die wortel , stingel , blaar en blom.

Aktiwiteit 1:

Om plante se organe te identifiseer

[lu 2.2]

Opdrag 1:

Voltooi die volgende oor die verskillende organe:

Plantorgaan Bogronds/Ondergronds Hooffunksie vir die plant

Aktiwiteit 2:

Om vas te stel hoe 'n plantwortel se bou aangepas is

[lu 1.2; 2.4]


Opdrag 1:

Gaan na die tuin of die skoolterrein en versamel een voorbeeld elk van vier klein soorte plantjies wat volop groei. Kies so ver moontlik onkruid. Sorg dat jy die hele plantjie met sy wortelstelsel uithaal. Spoel die grond af en plaas die plantjies op ‘n stuk skoon papier.

Is daar enige opmerklike verskil t.o.v. wortelstelsel?

As jy gelukkig is, sal jou plantjies twee verskillende soorte wortelstelsels hê. Maak 'n skets van die twee hoofsoorte wortelstelsels. Jou onderwyser sal jou lei.

Die TWEE tipes wortelstelsel staan bekend as die BYWORTELSTELSEL en PENWORTELSTELSEL .

Plante met ‘n penwortelstelsel het ‘n hoofwortel, wat diep groei. Die meeste plante wat ouer word as een jaar (meerjariges) het penwortelstelsels. Hierdie tipe wortelstelsel kan water diep in die grond bereik en die plant goed anker. Hoë bome en groot struike en bosse moet sulke wortelstelsels hê. Hulle behoort aan die groep TWEESAADLOBBIGES . Hulle het ontstaan uit saadjies wat twee saadlobbe het, soos die boontjiesaad. Daar is natuurlik ook baie tweesaadlobbige plante wat eenjarig is. Hulle het egter steeds penwortelstelsels.

Eensaadlobbiges, soos grassoorte en mielies, groei net vir een seisoen en het nie so ‘n diep wortelstelsel nodig nie. Hulle moet juis ‘n wye, vlak wortelstelsel hê om alle bietjies vog wat die grond bereik, te kan bekom. EENSAADLOBBIGE plante het ‘n bywortelstelsel en het ontwikkel uit sade met net een saadlob, soos ‘n mieliepit.

‘n Penwortelstelsel het een hoofwortel, nl. die penwortel, en die sywortels wat daaruit groei.

‘n Bywortelstelsel bestaan uit ewe groot wortels wat almal uit die onderpunt van die stingel groei en dit word bywortels genoem. Die wortels is onvertak.

Opdrag 2:

Voorsien jou sketse hierbo van die korrekte byskrifte.

1. Watter wortelstelseltipe sal jy by eenjarige petunias aantref?

2. Hoekom het hulle hierdie spesifieke wortelstelsel?

3. Watter wortelstelseltipe sal ‘n eikeboom hê?

4. Waarom sou hierdie wortelstelseltipe vir ‘n boom nodig wees?

5. Het bome bywortels? Verduidelik.

6. Kan sywortels uit bywortels groei? Verduidelik.

7. Noem die hooffunksies van wortels.

Assessering van Wortelstelsels

Kon jy tipes onderskei en kennis toepas?

[LU 1.2; LU 2.4]

Neem weer ‘n vars plant met wortels, spoel die grond af en kyk versigtig na die wortels. Kan jy die klein haaragtige groeisels op die wortelpunte sien? Hulle is veral duidelik wanneer jy jou eie boontjiesade laat ontkiem. Hierdie strukture noem ons wortelhare.

Questions & Answers

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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian 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 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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