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Summary Lewenswetenskap opsommings Graad 8 kwartaal 3 en 4 CAPS

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Die opsommings sluit in: - Mikro-organismes - Nuttige mikro-organismes - Skadelike mikro-organismes - Die sonnestelsel - Die planete in ons sonnestelsel - Voorwerpe in ons sonnestelsel - Buite die sonnestelsel - Ligjare, ligure en ligminute - Anderkant die melkweg - Vroee besigtiging van die ruimte - Radioteleskoop - Optiese teleskoop - Brekingsteleskoop - Weerkaatsingsteleskoop - Voorbeelde van teleskope - Sleutelwoorde

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Mikro-organismes
Mikro-organismes is al baie jare op aarde en het aangepas om in ekstreme omstandighede te leef.

Dit word in byna alle gebiede van die biosfeer van die aarde en nuwe mikro-organismes
aangetref word nog altyd ontdek.

Sommige kan skadelik wees en siektes veroorsaak (PATHOGENIES), terwyl ander nuttig is vir
ons en n belangrike deel van ekostelsels is.

Sommige kan gebruik word vir die vervaardiging van voedsel.

Klassifikasie van Mikro-organisme

Daar is n verskeidenheid mikro-organismes, insluitend:

• Virussen
• Bakteriee
• Fungi
• Protista

Tipes Mikro-organisme

Virussen

Virusse is klein organismes, baie Kleiner as bakteriee.

Viruses moet ander organisms of selle in besmet om te herhaal (reproduseer).

Hulle kan alle soorte organisms, soos plante, diere e nook bakteriee besmet.

As n virus n siekte veroorsaak, se ons dat die virus n patogeen is.

VIGS is n siekte wat veroorsaak word deur die MI-virus.

Corona-virusse is n groot familie viruses wat respiratoriese infeksies kan veroorsaak, wat wissel
van gewone verkoue tot ernstige infeksies.

Bakteriee

Bakteriee is n groot koninkryk mikro-organismes.

, Baie bakteriee is die oorsaak van siektes in mense.

Protiste

Protiste is n baie uiteenlopende groep mikroorganismes.

Die meeste protiste is mikroskopies en leef in water.

Die enigste mikroskopiese lede is alge of seewiere.



Fungi

Daar is baie verskillende soorte swamme.

Sommige is groot genoeg om sonder die hulp van n mikroskoop, soos sampioene en brood vorm.

Ander is mikroskopies en kan onder n mikroskoop soos gis.




Nuttige mikroorganismes
Ontbinding: baie ontbind is mikro-organismes

Hierdie mikro-organismes speel n baie belangrike rol in ekosisteme.

• Hulle breek dooie plant- en dieremateriaal af.
• Dit help om voedingstowwe na die grond terug te keer.
• Sommige haal stikstof uit die lug en omskep dit in stikstofverbindings wat diere en plante
kan gebruik.

Hierdie stikstofbevattende bakteriee benodig n gasheerplant.

Die bakteriee kry glukose van die gasheerplant en die plant kry stikstofverbindings.

Bakteriee in ons derms

Escherichia coli word in die onderste ingewande van baie warmbloedige diere aangetref.

Dit vorm deel van die natuurlike flora van die ingewande.

Connected book
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Publisher: 2013 ISBN: 9780199056088 Edition: Unknown

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Which chapters are summarized?
Kwartaal 3 en 4
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