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Natuurwetenskappe

Ekosisteem en omgewingsbalans

Opvoeders afdeling

Memorandum

Volgorde:

B;

D;

C;

A

Leerder afdeling

Inhoud

Aktiwiteit: om te verstaan hoe diere en insekte verskil ten opsigte van voortplanting/lewensiklus [lu 2.3]

(i) Diere verskil ook ten opsigte van hul voortplanting

Party kleintjies lyk net soos die volwassene by geboorte, maar ander moet eers ‘n gedaanteverwisseling (verandering of metamorfose) ondergaan voordat hulle soos die volwassene lyk. Sommige diere ondergaan ‘n gedeeltelike gedaanteverwisseling en ander ‘n volledige gedaanteverwisseling. ‘n Volledige gedaanteverwisseling bestaan uit die volgende stadiums: eier word gelê; larwe broei uit; ontwikkel in ‘n papie waaruit die volwassene uiteindelik ontwikkel.

INSEKTE: VRUGTEVLIEË

Vrugtevlieë behoort aan die Drosophilia-familie en is veral bekend as laboratoriumdiere waarmee daar proefnemings gedoen word. In die natuur kan hierdie vlieë soms groot skade in vrugteboorde aanrig as hulle nie betyds bestry word nie.

Volwasse vrugtevliegwyfies lê hul eiers in die skil van die vrugte wat dan vinnig sleg word en afval van die bome af. Die verrottende vrugtevleis is die voedingbron vir die larwe wat uitbroei. Die larwe kruip na ‘n paar dae in die grond en verander in ‘n papie. Na ongeveer twee tot drie weke kom die volwasse vlieg uit die papie te voorskyn.

Om die vrugtevlieg te bestry, moet sowel die volwasse vlieg wat die vrugte in die bome besmet as die grond onder die bome waar die papies is, met plaagmiddels behandel word.

Een wyfie kan 15 tot 50 eiers per dag lê en kan tot 900 eiers in ‘n leeftyd lê. Die hele lewensiklus van ‘n vrugtevlieg neem ongeveer twee weke. Voordat paring plaasvind, moet die manlike vlieg eers die wyfie hofmaak. Die wyfie sal hom slegs aanvaar as hy volwasse is en van dieselfde spesie as sy is. Die wyfie herken ‘n mannetjie van dieselfde spesie deur haar sig, gehoor en reuksin.

Opdrag 9

Die volgende skets stel die lewensiklus van die vrugtevlieg voor, maar in die verkeerde volgorde. Plaas dit in die korrekte volgorde en maak dan jou eie illustrasie van die volledige gedaanteverwisseling van die vrugtevlieg.

Groepassessering

Volgorde korrek 1 2 3 4
Kreatiewe voorstelling ______ ______ ______ ______
Sketse/illustrasies in verhouding ______ ______ ______ ______
Byskrifte ______ ______ ______ ______
Volgorde korrek ______ ______ ______ ______

Assessering

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

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

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
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
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 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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