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Natuurwetenskappe

Die aarde en daarbuite

Fossiele

Opvoeders afdeling

Memorandum

Opdrag 9:

  • Hulle het vroeër in woude gelewe.
  • Het nie nodig gehad om vinnig te kon hardloop nie.
  • Korter bene was voldoende om in woude te kon oorleef.
  • Word vandag in oop vlaktes aangetref.
  • Moet vinnig kan hardloop vir vyand.
  • Langer, meer gespierde bene help om te oorleef.
  • Word gebruik om op te ry en karre te trek.Het groter en sterker geword sodat dit ‘n effektiewe vervoermiddel kon word.

Leerder afdeling

Inhoud

Aktiwiteit: om die verandering van organismes met die verloop van tyd te kan bespreek [lu 2.3]

Plante en diere verander gedurig om aan te pas en beter in hul omgewings te kan oorleef. Die omgewing verander egter ook. Dit is waarom die dierelewe oor die eeue heen verander het.

  • Gedurende die tydperk van die dinosourusse was die wêreld meestal warm en droog. Geleidelik het die klimaat begin verander, nuwe diere en plante het begin ontwikkel en ander het uitgesterf. Soos die klimaat warmer en natter geword het, het groot woude van reuse varings en allerlei keëldraende bome ontstaan. In hierdie veranderende wêreld moes die dinosourusse ook verander om te kon oorlewe. Omtrent 100 miljoen jaar gelede het daar blomplante en bloeiselbome verskyn en stadigaan het daar woude van lourier- en eikebome begin groei. Voëls, insekte en ander diere het begin ontwikkel om die nektar en stuifmeel van die blomme te vreet.
  • Die dinosourusse het almal verdwyn, maar hulle het afstammelinge nagelaat. Indien fossiele bestudeer word, blyk dit dat krokodille en voëls die naaste lewende familie van die dinosourusse is. Die dinosourusse was wel reptiele, maar die reptiele het reeds 300 miljoen jaar gelede ontwikkel. Reeds voor die dinosourusse verskyn het, het die reptiele al in talle verskillende groepe vertak.

Verandering van organismes:

  • Sommige diere, soos bv. die kakkerlak, het oor miljoene jare byna niks verander nie. Om te oorleef moes ander diere egter aanpas en het hulle met verloop van tyd drasties verander. Perde was eens so groot soos ‘n terriër en het in woude gebly. Vandag is hulle vinnige langbeendiere wat op oop vlaktes bly. Dit staan bekend as natuurlike seleksie.

Prehistoriese Lewe, Van den Heever et al., p. 19

OPDRAG 9

  • Bespreek die rede vir bogenoemde aanpassings by perde eers in julle groepe. Skryf dan ‘n paragraaf waarin jy ten minste vyf moontlike redes verskaf vir hierdie verandering.

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LeerkragassesseringKRITERIA 1. 2. 3. 4.
1. Opdrag korrek voltooi.
2. Sinvolle inhoud
3. Kreatiewe denke openbaar.

Assessering

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

Assesseringstandaard 2.3: Dis duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
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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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