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Summary Graad 8_Natuurwetenskappe [NW] Opsomming R125,00   Add to cart

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Summary Graad 8_Natuurwetenskappe [NW] Opsomming

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'Hierdie graad 8-natuurwetenskappe-notastel bevat omvattende opsommings van alle onderwerpe wat in die sillabus gedek word gedurende kwartaal 1 tot 4. Dit is 'n moet-hê vir enige student wat wil presteer in hul graad 8-natuurwetenskappe-eksamen. Hierdie notas is perfek vir hersiening, wat studente...

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  • July 14, 2021
  • July 13, 2023
  • 42
  • 2020/2021
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3  reviews

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By: SimIStudying • 3 weeks ago

The summary does not cover all of the study themes.

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By: michellebosua • 5 months ago

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By: Nicole1997 • 2 year ago

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notedx19
nATUURWETENSKAP

, Fotosintese & Respirasie
ENERGIE > ONDERHOU LEWE:

→ energie behoefte (om lewe te onderhou) = dryf die interaksies in ekostelsels

Alle lewende dinge het energie nodig vir lewensprosesse:

Z Beweging
Z Groei
Z Warm bly
[Son = bron van energie in ekostelsels]

Z Lig

Z Hitte

[Plante = vang ligenergie vas > fotosintese]


FOTOSINTESE:
→ chemiese proses waartydens plante glukose van koolstofdioksied (uit die lug) en water
(uit die grond) maak deur energie van die Son te gebruik;

[NEWEPRODUK / BYPRODUK = suurstof]




[Chlorofil → groen stof in plante wat die energie van sonlig absorbeer/vasvang]



GLUKOSE:
→ suiker > eenvoudigste vorm van kos

→ Plante verander glukose in stysel, sellulose en ander chemiese verbindings [groei en
voortplanting benodig]




2 © Noted Summaries Graad 8 Natuurwetenskappe www.notedsummaries.co.za

, RESPIRASIE:
ENERGIE IN KOS:

➢ Kos bevat potensiële energie

➢ Kos se energie inhoud word in kilojoules(kJ) OF kilokalorieë gemeet (kCal)

➢ Die energie wat in kos geberg word, kan gemeet word deur ‘n klein hoeveelheid van
kos in ‘n instrument, wat ‘n kaloriemeter genoem word, te verbrand.

[Glukose = afgebreek → energie word gebruik → gebruik vir ligaamsprosesse
[RESPIRASIE]]

[RESPIRASIE → proses waartydens energie uit glukose vrygestel word
tydens 'n reeks chemiese reaksies]




RESPIRASIE & ASEMHALING:

VERSKILLENDE MANIERE VAN ASEMHALING:

➢ Visse → kieue

➢ Walvisse → gate bo op kop

➢ Ruspes → gaatjies teen lyf

➢ Mense → neusholtes (lug gaan na longe)



QUIIIIZZZZ!!!


HOEKOM HAAL JY HARDER ASEM AS JY OEFENING DOEN?
➢ Respirasie vind plaas in elke sel van jou liggaam.
➢ Wanneer jy draf of oefeninge doen benodig jy meer energie.
➢ Dit beteken dat respirasie vinniger plaasvind en dat jy dus meer suurstof as
gewoonlik benodig.
➢ Jou liggaam reageer outomaties op die behoefte aan meer suurstof deur harder
en vinniger asem te haal.




3 © Noted Summaries Graad 8 Natuurwetenskappe www.notedsummaries.co.za

, Interaksies & interafhanklikheid
EKOLOGIE > INTERAKSIE:

[EKOLOGIE → vertakking van die wetenskappe wat die interaksie van
organismes met ander organismes en hul omgewing bestudeer]

Ekoloog > Persoon wat hierdie verwantskappe en interaksies bestudeer



4 VLAKKE > STUDIE VAN DIE EKOLOGIE:

→ groep organismes van dieselfde spesie wat in 'n spesifieke area op
BEVOLKING 'n spesifieke tydstip aangetref word en hulle moet kan aanteel in
daardie gebied
[bevolkingsgroei & faktore wat bevolkingsgroei of -afname beïnvloed]
→ al die bevolkings van organismes wat interaksie in 'n spesifieke
GEMEENSKAP gebied het
[2 OF MEER BEVOLKINGS]
→ gemeenskappe se interaksie met die nie-lewende dinge in hul
EKOSISTEEM omgewing
[gemeenskap + habitat]
→ al die ekosisteme op Aarde kombineer om die biosfeer te vorm
BIOSFEER
EKOSISTEME > BIOTIESE & ABIOTIESE KOMPONENTE:

BIOTIES ABIOTIES
[LEWEND] [NIE-LEWEND]
Z Plante Z Temperatuur
Z Diere Z Sonlig
Z Mense Z Water
Z Wind
Z Sand


OPNAME METODES > GROOTTE VAN EKOSISTEEM:

KWADRAATOPNAMES DWARDSDEURSNIT MONSTERNEMING
→ ‘n vierkant of rooster vir opnames → ‘n lyn deur die studie gebied vir
[PLANTE / STADIG BEWEGENDE monsterneming

DIERE] [TOESTANDE VAN ABIOTIESE
FAKTORE WISSEL]




4 © Noted Summaries Graad 8 Natuurwetenskappe www.notedsummaries.co.za

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