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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

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
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
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
kkk nice
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
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
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
I'm not good at math so would you help me
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
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
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
good afternoon madam
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 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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