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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

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
ya I also want to know the raman spectra
Bhagvanji
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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