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Natuurwetenskappe

Graad 9

Plante: van bou tot genetika

Module 28

Plantorgane: stingels

Aktiwiteit:

Om te bepaal hoe die bou van die plantstingel met die funksies van die stingel verband hou

[lu 2.1; 2.2; 2.3; 2.4]

Plantstingels se funksie is om blare, blomme en vrugte van ‘n plant so te dra dat dit blootgestel is aan sonlig, bestuiwingsagente en vrugverspreiders.

By groot bome word die stingel later die stam en is dit baie verdik en versterk. Die bogrondse organe kan nie sonder water lewe nie. Omdat die water uit die grond kom, moet dit opwaarts vervoer word. Die “vervoerpype” vir die water en minerale soute word gevorm deur verlengde, dooie selle wat die hout van die plant uitmaak. Die plantkundige naam vir hout is x ileem . Hierdie voedingstowwe moet na die res van die plant vervoer word, die wortels ingesluit. Hierdie stelsel van lewende, verlengde selle vorm die bas van die plant. Die plantkundige term daarvoor is floëem .

Die blare vervaardig op hulle beurt stysel en suiker.

Opdrag 1:

Breek ‘n paar takkies of stingels van verskillende plante af. Plaas dit voor jou op die bank en kyk na die verskille.

Verdeel hulle in twee groepe: bruin houtagtige tipes en die groen kruidagtiges.

  1. Waarom sal dit verskil?
  1. Watter soort stingel sou die eenjarige eensaadlobbige plant hê?
  1. Watter soort stingel sou die meerjarige dikotiel, soos ‘n vrugteboom, hê?
  1. Wat beteken dit?
  1. Die blare stel ‘n plant in staat om asem te haal. Wat gebeur by bladwisselende soorte wat elke winter hul blare verloor? Hoe haal hulle asem? Eintlik moet ons vra: Hoe vind gaswisseling plaas?

Let op na die bruin, houtagtige takkie wat jy gepluk het. Die kanse is goed dat jy klein wit spikkeltjies op hierdie bruin takkies sien. Ons noem dit LENTISELLE. Lentiselle is openinkies wat gaswisseling in die winterseisoen moontlik maak.

Assessering van Stingelstudie

Kon jy informasie oproep om te onderskei?

[LU 2.1]

Opdrag 2:

  1. Teken een van elke tipe takkie – ‘n groen kruidagtige en ‘n bruin houtagtige een.

2. Jou onderwyser sal jou help om die volgende begrippe te beskryf. Hulle het almal te doen met strukture wat op die stingel aangetref word.

Eindknop:

Groeistreek:

Litte:

Knope:

Blaarlittetekens:

Oksel:

Skubblare:

3. Gebruik die lys by no. 2 en voorsien die illustrasies by no. 1 van byskrifte.

4. Jou gevolgtrekking: wat is die hooffunksies van stingels?

Assessering van Sketse en Vrae

Kon jy verskille en bou aandui?

[LU 2.2; 2.3]

Opdrag 3:

Die volgende kolomgrafiek toon die lengtegroei van ses verskillende sonneblomsaailinge (A, B, C, D, E, F) die eerste week na ontkieming aan.

  1. Wat is die verskil tussen ‘n kolomgrafiek en ‘n histogram?
  1. Watter gemerkte saailing het die gunstigste groeitoestand ondervind? Gee rede.
  1. Hoe hoog het saailing A in die eerste week gegroei?
  1. By watter twee saailinge was die lengtegroei dieselfde?
  1. Wat was die verskil in lengtegroei tussen saailinge B en F?
  1. Wat was die verskil tussen die langste en kortste saailing?
  1. Beskryf hoe ‘n stingel in lengte groei

Assessering van Grafiek

Kon jy vrae beantwoord?

[LU 2.3]

Assessering

LU 2

Konstruksie van Wetenskapkennis

Questions & Answers

How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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Source:  OpenStax, Natuurwetenskappe graad 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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