<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Lewe en lewenswyse

Opvoeders afdeling

Memorandum

  • Gewerweldes (vertebrate) en ongewerweldes (invertebrate)
  • Visse, amfibieë, reptiele, voëls, soogdiere
  • Gemeenskaplike kenmerk (bl. 10): ongewerweld

Tabel:

1. Seester, see-anemoon

2. Mossel, slak, seekat

3. Erdwurm

4. Sprinkaan, kriek, besie

5. Bosluis, spinnekop, skerpioen

6. Kreef, krewel/garnaal, krap

7. Honderdpoot, duisendpoot

Groep 1: 1, 2 en 3

Groep 2: 4, 5, 6 en 7

Rede: teenwoordigheid van eksoskelet (uitwendige skelet) of gelede pote al dan nie.

Opdrag 2:

Sleutel: altyd twee opsies, uitoefening van opsies moet na insekte lei. Volgende kenmerke moet ingesluit wees: ongewerweld, geleedpotig, eksoskelet, 6 pote.

Leerder afdeling

Inhoud

Aktiwiteit: om te ontdek hoe diere aangepas is om in hulle habitat te oorleef [lu 2.2]

DIEREVERSKEIDENHEID

Kan jy nog onthou wat jy in graad 6 oor die indeling van diere geleer het? Jy het geleer dat diere in twee hoofgroepe verdeel word, naamlik die

_________________________________ en _______________________________

Jy het ook geleer dat vertebrate in vyf groepe verdeel word:

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

Kom ons kyk nou ‘n bietjie na die invertebrate (ongewerweldes).

Ons gaan verskeie voorbeelde van die invertebrate bestudeer. Jy sal agterkom dat hulle almal bepaalde eienskappe deel, maar aan die anderkant ook baie verskil. Ons gaan op twee maniere probeer om dit maklik te maak om die ooreenkomste en verskille te verstaan en te onthou: ons gaan eerstens kyk hoe die diere aangepas is om te kan oorleef (dit bring verskille tussen verskillende diere mee), en ons gaan die diere op grond van die ooreenkomste en verskille klassifiseer. As jy dinge klassifiseer, beteken dit dat jy dié met dieselfde eienskappe in een groep plaas.

Bioloë het al meer as 2 miljoen verskillende soorte lewende organismes geïdentifiseer en nuwe soorte word nog steeds ontdek. Daar is ‘n streng internasionale kode waarvolgens lewende organismes benoem, gesorteer en geklassifiseer word. Dit is gegrond op die werk van Linnaeus wat voorgestel het dat elke organisme twee name kry. Vandag het alle lewende organismes twee wetenskaplike Griekse of Latynse name:

  • Die geslagsnaam (genus/genera) wat altyd met ‘n hoofletter geskryf word, bv. Panthera vir die groot katte.
  • Die spesienaam wat met ‘n kleinletter geskryf word, bv. leo vir die leeu.

Die leeu se volledige naam is dus Panthera leo terwyl die luiperd s’n Panthera pardus is. Dieselfde geld vir die ongewerwelde diere (invertebrate).

Ons gaan eers ‘n oorsig van die invertebrate doen sodat jy die groep met sy kleiner groeperings leer ken. Vir hierdie doel gaan ons na die ooreenkomste en verskille tussen die diere kyk.

Daarna gaan ons enkele voorbeelde in meer besonderhede bestudeer, sodat jy kan sien hoe die diere by die omstandighede in hul ekosisteme aangepas is.

KLASSIFISERING VAN DIE INVERTEBRATE

Hieronder word ‘n verskeidenheid invertebrate voorgestel.

Kan jy nog onthou watter kenmerk(e) vir al hierdie diere geld? ____________________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

Probeer hulle nou op grond van hul kenmerke in ongeveer agt groepe verdeel . In die tabel word vir elke groep een of twee kenmerke gegee wat dit vir jou makliker sal maak.

GROEP KENMERK DIERE
1 Geen kop, slegs een opening in die liggaam, met ‘arms’ rondom die mond
2 Sagte liggaam, groot spiervoet, soms arms, dikwels met ‘n skulp
3 Lang ronde liggaam wat uit ringvormige segmente bestaan, sonder pote
4 Harde of taai liggaam met ses gelede pote
5 Harde of taai liggaam met agt gelede pote
6 Harde of taai liggaam met tien gelede pote

Probeer nou die ses groepe in die tabel saamgroepeer om twee hoofgroepe te vorm :

Groep 1 bestaande uit groepe __________________________________

Groep 2 bestaande uit groepe __________________________________

Verduidelik hoekom jy hulle so gegroepeer het:

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

Vergelyk jou indeling met die volgende diagram:

Opdrag 2:

Stel ‘n sleutel saam wat iemand wat ‘n vreemde insek gevang het, sal lei tot die antwoord dat dit ‘n insek is.

Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.2: Dit is duidelik wanneer die leerder inligting kategoriseer: vergelyk kenmerke van verskillende kategorieë voorwerpe, organismes en gebeurtenisse.

Questions & Answers

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.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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
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
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask