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Natuurwetenskappe

Graad 5

Die aarde en die heelal

Module 20

Die aarde as lewende planeet

Aktiwiteit 1:

Om te kan sê hoekom lewe op aarde moontlik is

[lu 2.2]

Wat maak lewe op aarde moontlik?

  • Kom ons probeer vasstel watter dinge nodig is vir lewe op aarde.

Lees die volgende stukkie deur en probeer om vier dinge te vind wat nodig is vir lewe op aarde soos ons dit ken.

Die mens is gewoond daaraan om elke dag die son te sien opkom en te sien ondergaan. Maar besef ons altyd hoe belangrik dit is dat dit wel gebeur? Sonskyn bevat energie wat die aarde warm maak en lig verskaf.

Ons moet egter onthou dat ons nie van sonlig alleen kan lewe nie en dat ons nie hier sou gewees het as dit nie vir plante was nie. Plante het die wonderlike vermoë om sonlig op te vang en dit te gebruik om kos op te bou. As ons dan die plante eet, kry ons hierdie kos in ons liggame en ons kan lewe.

Plante kan egter nie kos met slegs sonlig opbou nie. Hulle moet die bestanddele vir die kos met hulle wortels uit die grond uithaal.

Water is ‘n besonder belangrike bestanddeel, maar daar is ook ander, soos yster en stikstof.

Ons sou ook nie van kos en water alleen kon lewe nie. Ons het ook suurstof nodig wat ons moet kan inasem. Hierdie suurstof kom in vars lug voor en word voortdurend deur die plante aangevul. Plante neem die ou lug wat diere uitasem in en vorm weer suurstof wat hulle aan die lug afgee.

Vier dinge wat dus nodig is vir lewe op aarde, is:

  1. ______________________________________________________________
  2. ______________________________________________________________
  3. ______________________________________________________________
  4. ______________________________________________________________

Aktiwiteit 2:

Om te kan verduidelik hoekom die son en plante noodsaaklik is vir lewe op aarde

[lu 1.1; 1.2; 1.3]

Lewe sonder ENERGIE is onmoontlik.

Dink aan tien aktiwiteite wat jy daagliks uitvoer en waarvoor jy energie benodig en skryf hulle neer.

Jy kry al die energie wat jy benodig uit die kos wat jy eet en drinkgoed wat jy drink. Hierdie eet- en drinkgoed kom alles oorspronklik van plante af. Die plante het dit met behulp van sonligenergie opgebou.

Skryf tien voorbeelde van kos en drinkgoed wat jy gereeld inneem, neer en dui dan langsaan elkeen aan van watter plant dit oorspronklik afkomstig is (soms is die plant eers deur ‘n ander dier geëet en jy het dan die vleis, of bv. die eier, geëet).

Dink aan nog redes waarom die son noodsaaklik is vir lewe op aarde en skryf dit neer.

Mens en dier is van plante as voedselbron afhanklik. Daar is egter nog ander redes hoekom plante belangrik is. Skryf VYF sulke redes neer.

Doen nou ‘n bietjie navorsing (lees na in boeke en tydskrifte en gesels met jou pa of ma of ouer broer of suster) oor die waarde van plante as medisyne. Sluit ten minste twee voorbeelde van plante in waarvan die medisinale waarde in Afrika of Suid-Afrika ontdek is.

Aktiwiteit 3:

Om oor die belangrikheid van bome te kan praat

[lu 1.2; 3.2]

  • Jy besef nou dat bome en ander plante die lewe op aarde onderhou.

Kom ons gee dus nog meer aandag aan bome.

Questions & Answers

differentiate between demand and supply giving examples
Lambiv Reply
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Lambiv
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Lambiv
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Venny Reply
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Eliyee
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Eliyee
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WARKISA
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Lambiv
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appreciation
Eliyee
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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
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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
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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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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.
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Jabir
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Abdisa Reply
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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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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 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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