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NATUURWETENSKAPPE

Ekosisteem en omgewingsbalans

Opvoeders afdeling

Memorandum

Opdrag 15:

1 Plante en diere gaan dood

2 Plante en diere produseer afvalmateriaal

3 Ontbinders breek die afvalmateriaal af en gebruik sommige dele as voedsel

4 Ander dele word afgebreek as chemikalieë en weer vrygestel in die lug of grond

5 Die chemikalieë word weer deur ander plante geabsorbeer en opgeneem in voedselketting.

LEERKRAG AFDELING

Inhoud

Aktiwiteit: om die belangrike rol wat plante in die ekosisteem vervul, te bestudeer [lu 1.2, lu 2.3]

Plante (produseerders) gebruik eenvoudig nie-lewende materiaal (water, sonlig, kooldioksied en minerale) om hul eie voedsel te vervaardig. Die proses word fotosintese genoem, maar jy sal meer daarvan in die volgende module leer. Suurstof word terselfdertyd vrygestel.

Ontwerp nog twee voedselkettings met plante as die produseerders.

(a) Die rol van swamme in die ekosisteem

Swamme staan bekend as die “arm” familie van die planteryk omdat hulle geen groen kleurstof bevat nie. Die groen kleurstof, chlorofil, stel groen plante in staat om self kos te vervaardig uit koolsuurgas en water. Groen plante staan dus op hulle eie voete en is van geen ander lewende wese afhanklik vir kos nie. Swamme en bakterieë, daarenteen, is dus net so afhanklik soos diere van die kos wat groen plante vir hulle moet berei.

Wanneer ‘n plant of ‘n dier doodgaan, gaan die opgebergde energie nie verlore nie. Mikroskopiese swamme en bakterieë teer op hul liggame en breek dit in die proses af. Sodoende word dit weer deel van die grond. Hierdie plante word ontbinders genoem, weens hulle unieke rol in die natuur.

Opdrag 15

Bestudeer die volgende diagrammatiese voorstelling oor die ontbindingsproses. Dit demonstreer hoe dooie organismes afgebreek en deur ontbinders hersirkuleer word. Gebruik nou die byskrifte wat volg en skryf hulle op die korrekte plekke in. Die byskrifte is nie in volgorde nie:

  • Plante en diere produseer afvalmateriaal, bv. blare.
  • Ontbinders breek die afvalmateriaal af en gebruik sommige dele as voedsel.
  • Ander dele word afgebreek as chemikalieë en weer vrygestel in die lug of grond.
  • Plante en diere gaan dood.
  • Die chemikalieë word weer deur ander plante geabsorbeer en weer opgeneem in die voedselketting.

(i) Struktuur van die Swamplant

Die swamplant self bestaan uit vertakte drade wat soms in vakkies verdeel is, bv. broodskimmel, of soms saamgevleg is tot ‘n groot, vaste liggaam, bv. sampioene. Baie swamme is eetbaar, maar daar is ook soorte wat uiters giftig is. Dit is veiliger om maar net die welbekende sampioene te eet. Die sampioen word as ‘n klein, ronde wit knopie deur die grond opgestoot. Dit word groter en rek uit op ‘n steel en gaan uiteindelik oop soos ‘n sambreel.

Onder die sambreel straal die sporeplaatjies in ‘n kring om die steel uit. In regte sampioene is die sporeplaatjies rooskleurig as hulle jonk is en swartbruin as hulle volwasse is. Geeneen van die giftige paddastoele het hierdie kleur nie, dus is die kleur die beste aanduiding of dit ‘n giftige paddastoel of ‘n eetbare sampioen is. ‘n Mens moet nooit ‘n paddastoel eet wat baie na ‘n sampioen lyk, maar wit plaatjies het nie, want dit kan mens se dood veroorsaak.

Questions & Answers

what is economic
Okechukwu Reply
Economics is a science of wealth
Taur
hi
scor
what is economic and what is the definition
scor
economic is science and arts both........
SHADAB
Explain any five limitation to division of labour
Aliyu Reply
production
Abddeeyat
size of the market. for example..let's take a look at a barbing saloon. the number of hands needed there isnt up to the one needed in a company or production line because the number of people the barbing saloon is serving cant be up to the ones of the company
Abisola
Answer: The four basic problems of an economy, which arise from the central problem of scarcity of resources are: What to produce?How to produce?For whom to produce?What provisions (if any) are to be made for economic growth?
Yusuf Reply
what is the basic economic problem
Arnold Reply
what is the basic problem
Arnold
importance of elasticity of demand
Ayuk Reply
what nature is price elasticity
Ayuk
nature of price elasticity
Ayuk
is it de basic economic problem
Arnold
Answer: The four basic problems of an economy, which arise from the central problem of scarcity of resources are: What to produce?How to produce?For whom to produce?What provisions (if any) are to be made for economic growth?
Yusuf
All teachers economic development
HASSAN
what is macro economics
ROGATH Reply
In the short-run, the monopoly makes?
Felix Reply
A demand which gives rise to the reverse of the law of demand is?
Felix
Price  (₦)Quantity Demanded 8  610  12 If we move from 8 to 6, the elasticity of demand is
Felix
inelastic demand
ROGATH
there is change in price but no change in demand. if price increase 10% but demand remain constant
Taur
does inventories accumulation included in GDP?
kelly Reply
Selling goods and services below or above the equilibrium price.
Daniel Reply
I will be there at the same time .....
SHADAB
Yes
HASSAN
Economics it big in the capital in
HASSAN
what is the meaning of black market
David Reply
the law of demand to price of goods if price is $13 and quantity $60, price $20 and y variable how calculate
Jackie Reply
what is diminishing marginal utility
Harish Reply
what is indifference curve
Harish
when the rate of utility goes on diminishing with every success ful unit is know as diminishing marginal utlity
Sana
what's economic growth
Rukundo Reply
what is economic growth
Rukundo
what is growth
Amina
growth is a sort form of development growth means development of only one specil part
RAJESH
one special part
HASSAN
what is wants
Daudu Reply
want is a specil desire whereas have you available resources for satisfying desire of products
RAJESH
what is scarcity
Syanda Reply
scarcity means wants
Daudu
scarcity is the situation whereby there are limited means in a world of unlimited ends.
suleysh
ok
Daudu
what is end?
Daudu
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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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