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Opdrag:

Doen naleeswerk en beskryf nog vyf maniere waarop plante waterverlies voorkom en vyf wyses waarop diere waterverlies voorkom.

Assessering

LU 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 bewys as die leerder:

1.1 ondersoeke kan beplan;

1.2 ondersoeke kan uitvoer en data kan insamel;

1.3 data kan evalueer en bevindinge kan kommunikeer.

LU 2

Wetenskaplike Kennis

Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Dit is bewys as die leerder:

2.1 sinvolle inligting kan onthou;

2.2 inligting in kategorieë kan plaas;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

LU 3

Wetenskap, die Gemeenskap en die Omgewing

Die leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Dit is bewys as die leerder:

3.1 wetenskap as ‘n menslike aktiwiteit kan verstaan;

3.2 volhoubare gebruik van die aarde se hulpbronne verstaan.

Memorandum

Aktiwiteit 1:

Waarde van water en die watersiklus

Eie voorstelling van watersiklus:

Maak seker dat die leerder al die terme in die tabel in sy skets gebruik het.

El Nino, droogtes en vloede

1. Help die klas om uit almal se terugvoer/voordragte die beste inligting te selekteer en neer te skryf

2. Soos by 1.

Waterbesparing by die huis

  • Hoe kan jou gesin bydra tot waterbesparing?
  • Maak ’n lys van die beste voorstelle:
  • Laat klas saam besluit oor die beste voostelle. Prys die leerder wie se lys die nouste met die klas se lys ooreenstem.

Aktiwiteit 3:

Aanpassings van plante en diere by toestande van watertekort

Drie groepe met voorbeelde : mesofiete (enige voorbeeld), xerofiete (bv. die aalwyn, ander vetplante, turksvy ens.), hidrofiete (waterlelie, ens.)

Ontwerp : Let op vlesige blare, dikwels klein, dat hulle sittend is en so gerangskik dat hulle water na die stam toe gelei. Blare kan ook baie klein en doringagtig wees. Kan ’n waslagie hê. Vlak wortels, baie vertak.

Opdrag:

  • Voorbeelde (aanvaar enige ander wat sin maak):
  • Plante
  • Harige blare
  • Min openinge (huidmondjies)
  • Openinge slegs aan onderkant van blaar
  • Vlesige stam en wortels
  • Groot ondergrondse dele waarin water gestoor kan word
  • Diere
  • Klein liggaamsoppervlak
  • Min of geen urienuitskeiding
  • Droë ontlasting
  • Min bloedvate naby vel in groot gedeelte van die liggaam (omdat die liggaam as gevolg daarvan nie baie kan afkoel nie, word ander meganismes ontwikkel om bepaalde dele soos die brein koel te hou; bv. die gemsbok sirkuleer bloed wat na die brein toe gaan deur die neusvleuels, sodat dit kan afkoel)
  • Eet kos met hoë voginhoud

Maak die leerders vertroud met die volgende begrippe:

Hyging: vinnige asemhaling met groot vogverlies vanaf slymvliese van die keel en mond – soos by honde en voëlsoorte

Estivering: somerslaap

Enkele sentimeters onder die grond is dit koeler – daarom tonnels

Migrasie: veral voëls en sekere boksoorte trek na beter voedselbronne self seisoenaal soos swaeltjies

Rete mirabilis: wondernetwerk bloedvate in gemsbok se neusvleuels vir afkoeling

Diere se oorlewingstrategieë

  • Gemsbok: koelteboom, en hou brein koel deur bloed in neus
  • Meerkatte: gaan onder grond
  • Kan beweeg na waar daar water is, vel sweet nie – verloor nie water nie maar kan afkoel deur te vlieg
  • Sweet slegs deur tong

Questions & Answers

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
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
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 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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