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Natural sciences

Grade 8

Environment

Module 38

Ecological problems and solutions

Many of the difficulties that are presently being experienced in nature are caused by humans.

The major problems stem from what is known as the HIPPO dilemma.

H - Habitat loss

I – Invader species

P – Pollution

P – Population growth

O - Over-population

Activity 1:

To realise what man’s role in ecological problems is, and to attempt to find solutions

Man is guilty of all five of these indiscretions. We deforest and simply destroy forests because we want to build roads, houses and industries. Just think of the Amazon: there has been a terrific loss of plants that have to contribute to our oxygen supply in the air.

We allow foreign species, especially plants and insects, to invade areas where they have no natural enemies and thus present major dangers for the indigenous species which are easily crowded out by the aggressive foreign species. Prime examples of this problem are the rooikrans trees on the Cape Flats or the black wattle trees along the rivers in the Boland.

Foreign bees are also a threat to our indigenous bees.

Pollution is obviously one of the most serious problems. We pollute the air, the soil and the water with chemicals, oil, plastic, other materials that are not bio-degradable, and also with noise.

All of this is made worse because the population is increasing by the day. (This has already been dealt with in the module on Biodiversity.)

The massive increase in population also causes over-utilization of all natural resources. The resource that is the most limited is naturally WATER.

Prepare a three-minute speech on the following topic: “Man is not part of an ecosystem, and as soon as he becomes involved in an ecosystem, he disturbs the system.”

Activity 2:

The following project focuses on the meaningful utilization of water as one of our most important natural resources

Project: WATER AUDIT AT SCHOOL

Divide into groups of four. Plan the following:

1. how you are going to determine the water consumption at your school;

2. how you are going to present the findings in a report;

3. which possible cases of water wastage you will be investigating;

4. which recommendations you will make.

  • Your teacher will fix a date for the submission of the report.
  • Each group will present its report to the class.
  • A summary of the final findings can be submitted to school management. A class discussion on the recommendations that are to be submitted would be valuable.
  • It would be useful to examine the following as part of the research assignment:

1. Wasting water at taps

You can determine the water consumption of the average learner by following these steps:

Divide into groups of four. You will need a large measuring cylinder, a stopwatch and a bucket.

One person in the group is the time-keeper.

Two people drink.

One person notes down the observations in a table.

When the stopwatch starts running, open the tap normally and drink, using your hand as you would normally do. In the bucket, catch up the water that runs off. The time-keeper will tell you to stop after 30 seconds. One person now pours the wasted water into the measuring cylinder and measures how much water has gone to waste. Repeat the procedure for the second person and find an average.

Questions & Answers

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
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
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
How can I make nanorobot?
Lily
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
how can I make nanorobot?
Lily
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
in a comparison of the stages of meiosis to the stage of mitosis, which stages are unique to meiosis and which stages have the same event in botg meiosis and mitosis
Leah 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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