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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

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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
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
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
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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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