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Natuurwetenskappe

Graad 5

Lewe en lewenswyse

Module 5

Saadontkieming

Aktiwiteit:

Om in groepies te gesels oor die ontkieming van sade

[lu 1.3, 2.1]

Bespreek die volgende vrae en skryf die antwoorde neer. Vorige aantekeninge mag gebruik word.

  1. Noem DRIE voordele om bome en plante op aarde te hê.

met sade in ‘n erdvarkgat, 30 cm onder die grond:

Rede:

met sade in 'n yskas:

Rede:

  1. Definieer die volgende terme: kiemwortel; blaartjie; tweesaadlobbige saad
  1. Noem drie maniere waarop saad versprei kan word. Sê ook by watter een van die vier julle dink die meeste sade aangepas is en hoekom julle so dink.

Drie maniere:

Die mees algemene manier en hoekom julle so dink

Waar of onwaar?

  • Die kiemwortel sal in enige rigting groei.
  • Sywortels groei vanaf die kiemwortel om water te absorbeer.
  • Wanneer die eerste blare verskyn, verwelk die saadlobbe.

Herrangskik die onderstaande sinne in die korrekte volgorde:

  • Die kiemwortel verskyn eerste en groei afwaarts.
  • Die saadlobbe swel uit nadat hulle water geabsorbeer het.
  • Die stingel groei opwaarts en die blare word groen.
  • Die saadhuid bars oop.
  • Sywortels ontwikkel uit die kiemwortel.
  • Twee klein blaartjies verskyn as die saadlobbe oopbars.

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

(i)    Verskaf suurstof

(ii)   Versier en maak ons omgewing mooi

(iii)  Dit hou die grond in posisie – verhoed gronderosie

(iv) Dit verskaf voedsel, ens.

(v)       Dit skep plekke waar diere kan lewe, bv. voëls bou neste, hasies bly in sagte grond onder plante/in gras.

(b)     enige paslike antwoord

(c)     (i)    Neem saadjies en strooi eweredig oor ‘n houer gevul met leemgrond, bedek liggies met dun lagie sand/leemgrond/, maak die grond effens klam en plaas in ‘n sonnige deel van die tuin.

Of

(ii)      Neem ‘n steggie (slegs sekere plante) – plaas dit in ‘n houer met water – in ‘n sonnige plek totdat worteltjies verskyn – plant dan in leemgrond, ens.

(d)     Sal nie ontkiem nie, te min lug en warmte

Sal ook glad nie ontkiem nie.             Rede:       het warmte nodig

 

(e)     Kiemwortel:     die eerste worteltjie wat verskyn tydens die onkieming van ‘n saad

Blaartjie:            die blaartjie is die plat groen gedeelte wat die plant help voed.

Tweesaadlobbige saad:         die saad het twee saadlobbe – twee saadlobbe aan weerskante van die babaplantjie.

(f)      wind; water; diere

Geen korrekte antwoord, laat leerders debateer.  Vir elkeen sal daar redes wees hoekom dit die mees algemene sou kan wees.

(g)     (i)      OW

(ii)      W

(iii)     W

(h)     (ii),       (iv),   (i),     (iii),    (v),    (vi).

 

 

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
Idrissa Reply
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Sherica
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Sherica
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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.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
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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
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ramon Reply
Kristine 2*2*2=8
Bridget Reply
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Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
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Samantha
what is the problem that i will help you to self with?
Asali
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
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Chris Reply
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Damian Reply
China
Cied
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abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
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Porter
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Yasmin
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Cesar
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Ramkumar Reply
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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
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
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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