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Natuurwetenskappe

Graad 8

Omgewing en interaksies

Module 33

Verskillende ekosisteme

Ons land is ryk aan wyduiteenlopende soorte ekosisteme.

Jou onderwyser sal julle waar moontlik na een of meer van hierdie ekosisteme neem.

Aktiwiteit 1:

Om die nut van ’n grasveld-ekosisteem te bespreek

[lu 1.3]

In groot dele van ons land vorm gras die grootste deel van die ekosisteme. Ons kan ook die term BIOOM gebruik om na die dele van ’n land wat min of meer dieselfde ekologiese kenmerke toon, te verwys. So kry ons byvoorbeeld ’n grasveldbioom. ’n Grasveldbioom kan as ’n groot ekosisteem beskryf word of dit kan in kleiner grasveld-ekosisteme verdeel word.

Kennis van die grasveldbioom en -ekosisteme is belangrik in Suid-Afrika, aangesien groot dele van die land vir veebeweiding benut word.

Wildsboksoorte soos impala, buffels en springbokke is ook grasvreters.

Die tipe gras in ’n ekosisteem word hoofsaaklik deur die aard van die grond bepaal.

Grasveldbiome word in terme van die dominante grassoort wat daarin voorkom, benoem.

Die hooftipes grasveld-ekosisteme (eintlik biome) is:

1. soetveld – lae reënvalgebiede; goeie voer vir vee;

2. suurveld – hoë reënvalareas; nie baie goeie weiding nie;

3. gemengde veld.

Rooigras Themeda triandra is ’n welbekende grassoort wat baie voedsaam is vir vee.

Oorbeweiding is die boer se grootste oortreding, want dit lei op sy beurt tot erosie, woestynvorming en gevolglik hongersnood.

Voer ’n klasdebat oor die volgende vraag:

  • Is die gereelde brand van gras goed of sleg vir die omgewing?
  • Dui die voor- en nadele soos wat dit uit die debat voortspruit in die kolom hieronder aan.
VOORDELE VAN BRAND NADELE VAN BRAND
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................

Assessering van DEBAT:

Het jy ’n waardevolle bydrae tot debat gelewer?

[LU 1.3]

Aktiwiteit 2:

Om ’n woud/boomekosisteem te bespreek

[lu 1.2; 1.3; 2.4]

Bome is nie net produseerders nie, maar vorm as gevolg van hul grootte ook die habitat van verskeie spesies.

Dier- en plantspesies bewoon bome.

Die blaarbedekking van bome verskaf skuiling vir voëls. Die bas en skeure in die boom verskaf ’n habitat vir ’n menigte insekspesies. Die blaarbedekking vorm ook ’n skaduryke omgewing vir skaduliewende, laaggroeiende plante.

Die blomme en vrugte wat bome in sommige gevalle voortbring, is ’n kosbron vir baie.

Questions & Answers

differentiate between demand and supply giving examples
Lambiv Reply
differentiated between demand and supply using examples
Lambiv
what is labour ?
Lambiv
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Venny Reply
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Rezat Reply
information
Eliyee
devaluation
Eliyee
t
WARKISA
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Lambiv
multiple choice question
Aster Reply
appreciation
Eliyee
explain perfect market
Lindiwe Reply
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
What is ceteris paribus?
Shukri Reply
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
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Shukri
Can I ask you other question?
Shukri
what is monopoly mean?
Habtamu Reply
What is different between quantity demand and demand?
Shukri Reply
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
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Shukri
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Lilia Reply
what is the difference between economic growth and development
Fiker Reply
Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
Abdisa Reply
any question about economics?
Awais Reply
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
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Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
Feyisa Reply
Answer
Feyisa
c
Jabir
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
Gsbwnw Reply
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
types of unemployment
Yomi Reply
What is the difference between perfect competition and monopolistic competition?
Mohammed
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Source:  OpenStax, Natuurwetenskappe graad 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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