<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Lewe en lewenswyse

Opvoeders afdeling

Memorandum

1. organismes

omgewing

nie-lewende

2. produsente (voedselproduseerders)

verbruikers

herbivore

karnivore

omnivore

3. Ligging, klimaat, grond, water, atmosferiese gasse (meer spesifieke faktore kan ook genoem word, bv helling en suid-/oos-/wes-/noordwysend ipv ligging, of temperatuur, reën en wind ipv klimaat).

Diagram:

1. Alle materiale word in die natuur gehersirkuleer en daarom raak die bronne nie uitgeput nie. Wat uit die grond of lug geneem word, keer uiteindelik weer terug.

2. Water: uit grond na plante en diere (en in lug in), weer terug na grond (urine en ontlasting) of lug (sweet, verdamping).

Koolstofdioksied: uit lug na plant, vasgelê in voedsel, na dier, vrygestel aan lug.

Bestanddele in grond, na plant, vorm voedsel, na dier wat plant vreet, met urine of ontlasting of as dier of plant vrek, terug na grond

3. Om te voorkom dat die natuurlike bronne uitgeput raak/die stowwe opgebruik word.

Leerder afdeling

Inhoud

Aktiwiteit: om jou kennis van ekosisteme te hernu [lu 2.1, 2.3]

Die ekosisteem

Toets jou kennis

Jy het in graad 6 reeds met die begrip “ekosisteem” kennis gemaak. Kom ons kyk wat jy nog kan onthou:

Voltooi: ‘n Ekosisteem is al die lewende ______________________ wat in ‘n

bepaalde _______________ lewe, asook al die ___________ faktore wat die

aard van die omgewing bepaal.

In ‘n ekosisteem is die plante die ___________________, terwyl die diere die

____________________ is. Diere kan op grond van hul voedingswyse in drie

groepe verdeel word, naamlik _________________, ____________________

en ___________________________________________________________ .

Die nie-lewende faktore wat die toestande in die ekosisteem bepaal, is _______________________________, _____________________________,

_______________________________ en ___________________________ .

Siklusse en balans binne ‘n ekosisteem

‘n Ekosisteem kan diagrammaties soos volg voorgestel word:

Probeer om die volgende vrae wat oor die diagram handel te beantwoord:

1. Hoekom word die ekosisteem in die vorm van ‘n siklus voorgestel?

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

2. Noem drie stowwe/verbindings wat volgens die diagram in ‘n ekosisteem gesirkuleer word en beskryf elke siklus kortliks:

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

3. Hoekom is dit belangrik dat die stowwe gesirkuleer word?

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

Assessering

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.1: Dit is duidelik wanneer die leerder betekenisvolle inligting onthou: onthou, ten minste, definisies en komplekse feite;

2.3 inligting interpreteer: interpreteer inligting deur kernidees in die teks te identifiseer, patrone in aangetekende data te vind en gevolgtrekkings te maak uit inligting in verskeie vorme (bv. prente, diagramme en geskrewe teks);

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask