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Natuurwetenskappe

Graad 5

Lewe en lewenswyse

Module 1

Die voortbestaan van plante

Aktiwiteit:

Om ondersoek in te stel na die voortbestaan van plante

[lu 1.2, 2.1, 2.2]

Inleiding:

Plante is belangrik vir die voortbestaan van die mens. Sonder plante sal die planeet Aarde sonder lewe wees.

Plante gee suurstof af. Suurstof is ‘n noodsaaklike gas in die atmosfeer wat die mens en dier inasem .

Plante voorsien ons van voedsel .

Plante verskaf materiaal soos hout, kurk, katoen, rubber, ens. vir verskillende gebruike.

Sekere plante het helende stowwe soos kruie wat as medisyne gebruik kan word, bv. boegoe, aalwyn, ens.

Wat dink jy?

Net soos diere is plante ook lewendig. Die verskil is dat diere beweeg om hul voedsel te bekom, terwyl plante nie beweeg nie. Plante is op een plek vasgeanker en vervaardig hul eie voedsel. Hierdie proses vind in die blare plaas en word fotosintese genoem.

Hoe vervaardig plante hul eie voedsel?

Plante neem die gas koolstofdioksied uit die lug, absorbeer water uit die grond, vang die ligenergie van die son op in die blare (bladgroen) en verander die water en koolstofdioksied tot energieryke voedsel /kos.

Sodoende kan die plant groei en dien dit ook as voedsel vir diere.

Hierdie proses vind slegs in die dag plaas.

Interessante feite:

Daar is ongeveer 350 000 soorte plante, struike en bome.

Plante het verskillende vorms en kleure.

Die blare en blomme verskil ook in vorm en kleur.

Hierdie verskeidenheid is belangrik vir die oorlewing en voortplanting van plante, omdat hulle nie oormatig kompeteer nie: sommige hou bv. van vol son, ander hou van skaduwee.

Noem nog maniere waarop plante van mekaar verskil en dus nie kompeteer nie.

Dit is die natuur se manier om uitsterwing van ‘n spesie te voorkom.

Toets jou kennis: Beskryf kortliks hoe jy die energie bekom wat jy elke dag gebruik om skool toe te kom, sport te beoefen en te speel.

Opdrag 1: groepwerk

Soek inligting oor ‘n boom of ander plant wat as ‘n bedreigde spesie beskou word. Skryf jou notas neer en gee mondelinge terugvoer aan die klas oor die volgende:

waar dit voorkom;

waarom dit as bedreig beskou word;

op watter maniere daar te werk gegaan word om die spesie van totale uitsterwing te red.

Plaas jou notas in jou portefeulje

n Bedreigde spesie is ‘n plantsoort of diersoort waarvan daar min oor is en as dit nie spesiale beskerming kry nie, heeltemal uitgeroei sal word.

Assessering

LU 1

WETENSKAPLIKE ONDERSOEK Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Dit is duidelik wanneer die leerder:

1.1 ondersoeke beplan;

1.2 ondersoeke uitvoer en data versamel;

1.3 data evalueer en bevindinge kommunikeer;

LU 2

KONSTRUKSIE VAN WETENSKAPKENNIS Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Dit is duidelik wanneer die leerder:

2.1 betekenisvolle inligting onthou;

2.2 inligting kategoriseer;

2.3 inligting interpreteer.

Memorandum

plante:

Baie moontlikhede, bv. sommiges groei in water, ander in droë grond; sommiges rank; sommiges het diep wortels, ander het vlak wortels.

Leerlinge moet self navorsing doen om opdrag uit te voer, maar die volgende voorbeeld inligting sal die leerders wat sukkel om die nodige inligting te bekom, dalk help

Vleiroos: ‘n Proteasoort wat in die Weskaap voorkom. In 1968 was daar ± 10 plante oor en die plant het byna uitgesterf. Mense wat bewus is van die waarde van geberg ingeval van ‘n ramp. Dit word vandag nog beskerm veral teen veldbrande.

Welwitschia: Dit is eintlik ‘n dwergboom wat in die Namibwoestyn voorkom. Die mense dink die ouderdom van die Welwitschia wissel tussen 1 500 en 2 500 jaar oud. Dit het lang blare wat reg deur die leeftyd van die plant groei.

Die Bergbruidjie: Het amper uitgesterf - seker die mooiste SA proteasoort. In 1962 was daar slegs ‘n paar in Franschhoek-omgewing oor. ‘n Eienaardige gebeurtenis het dit toe gered. ‘n Veldbrand wat in daardie omgewing gewoed het, het die sade laat

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
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Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
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a perfect square v²+2v+_
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algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
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Embra Reply
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rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
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J, combine like terms 7x-4y
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Asali
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Asali
how do you translate this in Algebraic Expressions
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Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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Cied
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I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
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Yasmin
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Cesar
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AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
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AMJAD
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AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
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Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
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Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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the Beer law works very well for dilute solutions but fails for very high concentrations. why?
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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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