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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

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
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
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
My ma het umfeseem en ha voete swel baie en sy kani uriene afslaan ni wat kan dit veroorsaak
Miggie Reply

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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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