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Natuurwetenskappe

Lewe en lewenswyse

Opvoeders afdeling

Memorandum

  • Almal het agt pote. Gelitte pote en uitwendige skelet is gemeenskaplike kenmerk.
  • Kopborsstuk en agterlyf.
  • Die voettasters kan groot wees en soos pote lyk.
  • Aan die kopborsstuk.
  • Slegs enkelvoudige oë, soms sommiges groter en sommiges kleiner: agt in totaal

Opdrag 4:

1. Die spinnekoppe vrek van die gif, terwyl die vlieë vermeerder, moontlik omdat daar minder spinnekoppe is.

2. Kan ‘n voëlsoort wees wat van insekte en spinnekoppe lewe. Vreet dalk ruspes wat vergiftig is, of daar is nie meer spinnekoppe om te vreet nie.

3. Dit is belangrik om die balans in die natuur te handhaaf.

Leerder afdeling

Inhoud

Aktiwiteit: om enkele aragnide te bestudeer [lu 1.3, lu 2.3, 2.4]

Die spinnekop

Die spinnekop behoort tot die groep spinagtiges of Arachnida . Dit is beter om van die Aragnide te praat eerder as van die spinagtiges, omdat al die lede van die groep nie spinnerakke bou nie, bv. bosluise en skerpioene.

Kan jy nog onthou wat die kenmerk van alle Aragnide is?

Almal het ____________________________________________________ pote.

Kan jy nog onthou watter kenmerk die Aragnide in gemeen het met die insekte?

____________________________________________________________________

As jou onderwyser ‘n dooie spinnekop of skerpioen het, kyk na sy liggaamsbou en probeer die volgende vrae beantwoord:

Kan jy ‘n kop, bors en agterlyf onderskei soos by die sprinkaan? _________________________________________________________

Hoekom lyk dit asof daar tien pote is?____________________________________

_____________________________________________________________________

Aan watter deel van die liggaam word hulle gedra? ___________________________

Kan jy klein en groot oë soos by die sprinkaan sien? __________________________

Liggaamsbou

Die spinnekop se liggaam bestaan uit slegs twee dele, nl. ‘n kopborsstuk en agterlyf. Daar is agt enkelvoudige oë op die kopborsstuk (die spinnekop het nie saamgestelde oë soos die insekte nie), asook twee tasters. Die spinnekop het twee opvallend groot kaakkloue waarmee prooi gevang word.

Op die punt van die agterlyf is daar spintepels waarmee die spinnekop spinnerakke bou om prooi te vang.

Die huidbedekking (eksoskelet) is leeragtig en harig.

Beweging

Spinnekoppe is besonder rats, veral die wat nie hul prooi met spinnerakke vang nie, bv. die groot jagspinnekop.

Voeding

Spinnekoppe is vleisetend en verlam hul prooi met gif wat in hul kaakkloue voorkom. Die tasters hanteer die prooi terwyl dit gevreet word. In Suid-Afrika is slegs enkele spinnekoppe gevaarlik vir die mens, bv. die knopiespinnekop (swart met duidelike merke aan die onderkant; die liggaam sonder pote is ongeveer die grootte van ‘n grondboontjie). Spinnekopbyte kan egter ontsteking veroorsaak as gevolg van kieme wat aan hul monddele vassit.

Asemhaling

Die spinnekop het asemhalingsopeninge aan die onderkant van die agterlyf wat na inwendige boeklonge lei.

Handhawing van waterbalans

Soos die sprinkaan, verkry spinnekoppe die bietjie water wat hulle benodig uit hul voedsel.

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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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