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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

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
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
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
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
hi
Loga
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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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