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Natuurwetenskappe

Graad 4

Lewe en lewenswyse

Module 8

'n eenvoudige voedselketting

Aktiwiteit:

Om 'n eenvoudige voedselketting te verstaan

[lu 1.3]

Om gesond en vol energie te wees, het alle plante en diere voedsel nodig. Plante het ‘n unieke eienskap, en dit is om hul eie voedsel te vervaardig. Hulle doen dit deur sonlig, koolstofdioksied uit die lug, asook water en minerale uit die grond te gebruik.

Alle lewende wesens het voedsel nodig wat deur groen plante gemaak word. Die dele van ‘n voedselketting is soos die skakels in ‘n ketting: as een skakel weg is, is die ketting nutteloos, totdat dit weer reggemaak word. Elke deel van die voedselketting is belangrik vir die voortbestaan van die ekosisteem.

Opdrag:

Die volgende voedselkettings is verkeerd. Maak hulle reg:

mielies, son, boer, eier, hen

Koei, seun, son, gras, melk

Leeu, bok, gras, son

Roofvoël, son, muis, koring

MAAK NOU JOU EIE VOEDSELKETTING.

Assessering

LEERUITKOMS 1: WETENSKAPLIKE ONDERSOEK Die leerder is in staat om met selfvertroue op  weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Dit is duidelik wanneer die leerder:

1.1   ondersoek beplan;

1.2   ondersoek uitvoer en data versamel;

1.3       data evalueer en bevindings kommunikeer.

 

Memorandum

Opdrag

  • Son, mielies, hen, eier, boer
  • Son, gras, koei, melk, seun drink
  • Son, gras, bok, leeu
  • Son, koring, muis, roofvoël
  • Enige aanvaarbare een

Questions & Answers

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
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
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
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Natuurwetenskappe graad 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11097/1.1
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