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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

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
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Akash Reply
it is a goid question and i want to know the answer as well
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Do somebody tell me a best nano engineering book for beginners?
s. Reply
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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.
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Mostly, they use nano carbon for electronics and for materials to be strengthened.
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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?
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s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
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I'm interested in nanotube
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Ramkumar Reply
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Sravani Reply
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Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
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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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