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NB- Come back and use South African examples for the model answer examples

Examine the data you collected when making your ABC profile. Use your collected data to answer the following questions.

1. What effect does the environment (abiotic) have on the organisms (biotic) living there? Give FIVE specific examples from your profile. [For example: Lily pads (biotic) are able to grow in my area because it is a natural wetland that has standing, stagnant water (abiotic) all year long.]

2. What effect do the organisms (biotic) have on the environment (abiotic)? Give THREE specific examples from your profile. [For example: The area is heavily shaded by spruce trees (biotic). The shade keeps the soil moist (abiotic) and reduces the air temperature.]

3. How do natural forces affect the area? Give ONE specific example from your profile. Consider the direction of the prevailing winds, the direction from which the sun’s rays come, gravity (if you are on a slope), etc…

4. How have humans affected your area? Give ONE specific example.

5. Predict how your area would change if the amount of rainfall doubled. Be sure to mention how this increase in rainfall would affect the abiotic and bioticfactors.


Question 1

Read the following text and answer the questions that follow :

South Africa has offered to slow the growth of its greenhouse gas emissions by 34% by 2020. The biggest producers of greenhouse gases in South Africa areEskom, the producers of electricity, and Sasol, the producers of petrol and diesel from fossil fuels.

1.1.Which is the most important greenhouse gas?(1)

1.2.Explain why Eskom and Sasol produce the most greenhouse gases. (2)

1.3.You are a scientist who has been employed by the government to check that the target is reached. Briefly explain the methodology you would use to dothis. (3)

1.4.Suggest two strategies that Eskom and Sasol could use to reduce their greenhouse gas emissions. (2)

Question 2

Study the table below on ozone depletion and answer the questions that follow:

Amount of ozone depletion of stratosphere between 1982&1996

Year Ozone depletion (in tons)
1982 2000
1984 3000
1986 4000
1988 3500
1990 6000
1992 7000
1994 8000
1996 7000

2.1.Comment on the ozone depletion during the period 1982 to 1996.(2)

2.2.How much of the ozone was lost from the stratosphere in 1990? (1)

2.3.CFC's can stay around for about 100 years. What is the implication of this for the ozone layer? (1)

2.4.Give ONE possible reason for the decrease in ozone depletion after 1994.(2)

Question 3

The dying of trees due to acid rain is brought about by changes in the pH of thesoil. Tshepo observed that trees in his town were gradually dying. He decided to investigate the effect of acid rain on germinating bean seeds. He did thefollowing:

  • Placed cotton wool on 6 saucers
  • Poured a solution with a different pH (varying from pH 2 to pH 7) onto the cotton wool in each saucer
  • Placed 50 bean seeds onto the cotton wool in each saucer
  • Covered the seeds and left them on the shelf for a week
  • The following results were obtained:

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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
How can I make nanorobot?
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
how can I make nanorobot?
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
why and for what was five kingdom of classification of organisms introduced
give the ans as fast as possible
Comment on the ozone depletion over the period of 1982 to 1996
Mpho Reply

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Source:  OpenStax, Siyavula: life sciences grade 10. OpenStax CNX. Apr 11, 2012 Download for free at http://cnx.org/content/col11410/1.3
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