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To brush up your knowledge of eco-systems

Natural sciences

Life and way of living

Educator section


1. organisms



2. producers/manufacturers (food producers)





3. Location, climate, soil, water, atmospheric gases (more specific factors may also be listed, e.g. slope and south- /east-/ west-/ north-facing instead of location, or temperature, rain and wind instead of climate)


1. All materials are recycled in nature and that is why the resources are not depleted. Whatever is taken from the soil or the air is eventually returned to it.

2. Water: from the soil to plants and animals (and into the air), back to the soil (urine and faeces) or air (perspiration, evaporation).

Carbon dioxide: from the air to the plant, fixed in food, to the animal, released into the air.

Components in the soil to the plant, forming nutrients, to animal that eats the plant, returning to the soil with urine or faeces, or when the plant or animal dies

3. To prevent depletion of natural resources/ substances being used up

Leaner section


Activity 1: to brush up your knowledge of eco-systems [lo 2.1, 2.3]

The ecosystem

Test your knowledge

You were introduced to the concept of the ecosystem in Grade 6. Let us see how much you can remember:

Complete: An ecosystem is all the living ___________________ that live in a

specific _________________ as well as all the __________________ factors

that determine the nature of the environment.

In an ecosystem, the plants are the ____________________ while the animals

are the _______________________ Animals can be divided into three groups

on the basis of their manner of feeding, namely _______________________,

___________________________ and _______________________________

The non-living factors which determine conditions in the ecosystems are

_______________________________, _____________________________,

_______________________________ and ___________________________ .

Cycles and balance within an ecosystem

An ecosystem can be represented diagrammatically as follows:

Try to answer the following questions that deal with the diagram:

1. Why is the ecosystem represented as a cycle?








2. Name three substances/compounds that are circulated in an ecosystem according to the diagram, and give a brief description of each cycle:








3. Why is it important for the substances to be circulated?









Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

Assessment Standard 2.1: We know this when the learner recalls meaningful information (at least definitions and complex facts);

Assessment Standard 2 .3 We know this when the learner interprets information.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Natural sciences grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11077/1.1
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