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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

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
salma
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
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
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
I rally confuse this number And equations too I need exactly help
salma
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
salma
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
hi
salma
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
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
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
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
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
good afternoon madam
AMJAD
what is system testing
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
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
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.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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