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Natuurwetenskappe

Graad 9

Plante: van bou tot genetika

Module 29

Plantorgane: blomme

Blomplante (Angiosperme) is die volopste en suksesvolste plantgroep op aarde. Die geheim lê deels in die manier waarop hulle hulself voortplant. Die sleutel tot hierdie geheim lê in die bou en werking van blomme. Die feit dat hierdie voortplantingsmetode ook GESLAGTELIK is, maak dit nog meer suksesvol.

Die blom is dus ‘n struktuur waar beide manlike en vroulike strukture van die plant teenwoordig is. Soms is dit wel in aparte blomme, maar meestal saam in een tweeslagtige blom.

Aktiwiteit 1:

Om blomme as voortplantingstrukture te kan beskryf

[lu 2.2; 2.3]

Opdrag 1:

  1. Neem ‘n blom en sny dit in die lengte deur. Die Petunia is ‘n goeie voorbeeld. Maak ‘n skets van die blom om al sy dele te toon (sonder byskrifte).
  1. Noem die funksies van elk van die volgende (soek dit op of vra jou onderwyser om te help):
Helmknop:
Helmdraad:
Stempel:
Styl:
Vrugbeginsel:
Saadknop:
Kroonblaar:
Kelkblaar:
Meeldraad:
Stamper:
Blomsteel:
  1. Probeer nou al die dele by no. 2 op jou skets by no. 1 aandui.

4. Beantwoord die volgende vrae:

Wat noem ons die groep plante wat blomme dra?

Is alle blomsoorte kleurvol? Verduidelik.

Ruik alle blomme geurig? Verduidelik.

Wat is die funksie van alle blomme?

Assessering van Sketse

Kon jy basiese verskille onderskei?

[LU 2.2; 2.3]

Aktiwiteit 2:

Om bestuiwing as 'n noodsaaklike proses in die voortplanting van blomplante te beskryf

[lu 1.1; 1.2; 1.3; 2.4]

Bestuiwing is die proses waardeur ‘n ryp stuifmeelkorrel moet land op ‘n ryp stempel van dieselfde soort plant.

Opdrag 1:

1. Hoekom moet die stuifmeelkorrel ryp wees?

2. Hoekom moet die stempel ryp en ontvanklik wees?

3. Hoekom moet dit dieselfde soort plant wees?

Elke plant se stuifmeelkorrelstruktuur is mikroskopies anders. Dit verseker dat ‘n stuifmeelkorrel amper soos ‘n slot in ‘n sleutel moet pas. Sodra ‘n ryp stuifmeelkorrel geland het, begin dit ontkiem.

Opdrag 2:

Doen ‘n bietjie naslaanwerk oor stuifmeelkorrels en stempels van verskillende soorte plante.

Stel ‘n sketsblad saam van die verskillende soorte wat jy kon opspoor.

Assessering van Naslaanwerk

Kon jy basiese verskille onderskei?

[LU 1.1; 1.2; 1.3]

Opdrag 2:

Ontwerp jou eie blom na aanleiding van die volgende leidrade.

Jou blom is ‘n eksotiese soort waarvan daar baie min is. Dit groei hoog in die berge waar daar omtrent geen insekte is nie. Dit moet staat maak op die wind om bestuiwing te bewerkstellig. Jou meganisme waarmee bestuiwing moet plaasvind, gaan absoluut bepaal hoe jou blom se bou gaan lyk.

Assessering van Ontwerp

Kon jy basiese verskille onderskei?

[LU 2.4]

Aktiwiteit 3:

Om bevrugting as 'n noodsaaklike proses in die voortplanting van blomplante te beskryf

[lu 2.1; 2.2]

Ons het reeds genoem dat daar twee hoofprosesse is wat moet plaasvind: bestuiwing en bevrugting. Ons weet nou wat bestuiwing is en dat die uiteindelike mikpunt is om by die ryp saadknoppe uit te kom en dit te bevrug.

Bevrugting is die samesmelting van die spesiale kerninhoude (gamete) van ‘n stuifmeelkorrel en ‘n saadknop

Die kerninhoud waarna verwys word, is spesiale molekules met ‘n kode of “plan” van hoe die nuwe plant moet lyk. Ons noem dit die chromatiennetwerk en dit bestaan uit die molekule wat bekend is as DNA. Jy sal later leer waarvoor dit presies staan.

Questions & Answers

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
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
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
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket 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 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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