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Natural sciences

Grade 8

Environment and interactions

Module 30

Different ecosystems

Our country has a wealth of widely differing kinds of ecosystems.

If possible, your teacher will take you to one or more of these ecosystems.

Activity:

To discuss the role of a grassland ecosystem

[lo 1.3]

In large parts of our country grass forms the greatest part of the ecosystems. We can also use the term BIOME to refer to the parts of the country that show more or less the same ecological characteristics. For instance, there is a grassland biome. A grassland biome can be described as a large ecosystem or it can be divided into smaller grassland ecosystems.

Knowledge of the grassland biome and grassland ecosystems is important in South Africa, because great parts of the country are utilized for grazing animals.

Game such as impala, buffalo and springbuck are also grazing livestock.

The type of grass in an ecosystem is mainly determined by the nature of the soil.

Grassland biomes are named according to the dominant grass type that is found in the system.

The main types of grassland ecosystems (actually biomes) are:

1. sweet veld – low rainfall areas; good livestock grazing;

2. sour veld – high rainfall areas; not very good grazing;

3. mixed veld.

Red grass ( Themeda triandra ) is a well-known grass type that is very nutritious for livestock.

Over-grazing is the most serious offence that a farmer can commit, because it leads to soil-erosion, desert creation and eventual famine.

Have a class debate on the following question:

  • Is the practice of regularly burning grass good or bad for the environment?
  • Write down the advantages and disadvantages of burning grassland, as mentioned in the debate, in the columns below:
ADVANTAGES OF BURNING DISADVANTAGES OF BURNING
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................
.............................................................. ..............................................................

Assessment of DEBATE:

Have you made a meaningful contribution to the debate? [ LO 1.3]

Activity:

To discuss forest/tree ecosystems

[lo 1.2; lo1.3; lo 2.4]

Trees are not only producers , but as a result of their size they also create a habitat for certain species.

Animal and plant species inhabit trees.

The leaf cover of trees provides shelter for animals, while the bark and fissures in the trees also provide a habitat for numerous insect species. The leaf cover also creates a shady environment in which shade-loving, low-growing plants can flourish.

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
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Source:  OpenStax, Natural sciences grade 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11050/1.1
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