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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
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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