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Natuurwetenskappe

Graad 5

Die aarde en die heelal

Module 20

Die aarde as lewende planeet

Aktiwiteit 1:

Om te kan sê hoekom lewe op aarde moontlik is

[lu 2.2]

Wat maak lewe op aarde moontlik?

  • Kom ons probeer vasstel watter dinge nodig is vir lewe op aarde.

Lees die volgende stukkie deur en probeer om vier dinge te vind wat nodig is vir lewe op aarde soos ons dit ken.

Die mens is gewoond daaraan om elke dag die son te sien opkom en te sien ondergaan. Maar besef ons altyd hoe belangrik dit is dat dit wel gebeur? Sonskyn bevat energie wat die aarde warm maak en lig verskaf.

Ons moet egter onthou dat ons nie van sonlig alleen kan lewe nie en dat ons nie hier sou gewees het as dit nie vir plante was nie. Plante het die wonderlike vermoë om sonlig op te vang en dit te gebruik om kos op te bou. As ons dan die plante eet, kry ons hierdie kos in ons liggame en ons kan lewe.

Plante kan egter nie kos met slegs sonlig opbou nie. Hulle moet die bestanddele vir die kos met hulle wortels uit die grond uithaal.

Water is ‘n besonder belangrike bestanddeel, maar daar is ook ander, soos yster en stikstof.

Ons sou ook nie van kos en water alleen kon lewe nie. Ons het ook suurstof nodig wat ons moet kan inasem. Hierdie suurstof kom in vars lug voor en word voortdurend deur die plante aangevul. Plante neem die ou lug wat diere uitasem in en vorm weer suurstof wat hulle aan die lug afgee.

Vier dinge wat dus nodig is vir lewe op aarde, is:

  1. ______________________________________________________________
  2. ______________________________________________________________
  3. ______________________________________________________________
  4. ______________________________________________________________

Aktiwiteit 2:

Om te kan verduidelik hoekom die son en plante noodsaaklik is vir lewe op aarde

[lu 1.1; 1.2; 1.3]

Lewe sonder ENERGIE is onmoontlik.

Dink aan tien aktiwiteite wat jy daagliks uitvoer en waarvoor jy energie benodig en skryf hulle neer.

Jy kry al die energie wat jy benodig uit die kos wat jy eet en drinkgoed wat jy drink. Hierdie eet- en drinkgoed kom alles oorspronklik van plante af. Die plante het dit met behulp van sonligenergie opgebou.

Skryf tien voorbeelde van kos en drinkgoed wat jy gereeld inneem, neer en dui dan langsaan elkeen aan van watter plant dit oorspronklik afkomstig is (soms is die plant eers deur ‘n ander dier geëet en jy het dan die vleis, of bv. die eier, geëet).

Dink aan nog redes waarom die son noodsaaklik is vir lewe op aarde en skryf dit neer.

Mens en dier is van plante as voedselbron afhanklik. Daar is egter nog ander redes hoekom plante belangrik is. Skryf VYF sulke redes neer.

Doen nou ‘n bietjie navorsing (lees na in boeke en tydskrifte en gesels met jou pa of ma of ouer broer of suster) oor die waarde van plante as medisyne. Sluit ten minste twee voorbeelde van plante in waarvan die medisinale waarde in Afrika of Suid-Afrika ontdek is.

Aktiwiteit 3:

Om oor die belangrikheid van bome te kan praat

[lu 1.2; 3.2]

  • Jy besef nou dat bome en ander plante die lewe op aarde onderhou.

Kom ons gee dus nog meer aandag aan bome.

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
?
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
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 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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