<< Chapter < Page Chapter >> Page >

pH

Number of germinating seeds

2 0
3 4
4 10
5 15
6 28
7 35

3.1.Name the independent variable in this investigation.(1)

3.2.Name the dependent variable in this investigation.(1)

3.3.Name TWO ways in which the investigation could be improved to obtain accurate and valid results.(2)

3.4.Describe the relationship between pH and the number of germinating seeds. (2)

3.5.Suggest THREE strategies that the government can use to help reduce the formation of acid rain. (3)

QUESTION 4

The graph below shows the effect of biocontrol on an invasive alien plant population.

Graph showing the effect of biocontrol on an invasive alien plant population.

4.1.Explain what is meant by the term ‘biocontrol’.(1)

4.2.Give two reasons that you can see from the graph to support the fact that biocontrol has been successful in controlling the alien plant population. (2)

4.3.Why is host specificity so important when introducing a biocontrol agent?(2)

Read the following text and answer the questions that follow:

QUESTION 5:

GLOBAL BURDEN OF DISEASE DUE TO INDOOR AIR POLLUTION

In the year 2000, indoor air pollution from solid fuel use was responsible for more than 1,6 million annual deaths. Smoke and gases that come from the burningof fossil fuels, such as coal, charcoal and wood, to heat homes and to cook contributes to indoor pollution.

Dependence on burning fossil fuels to meet basic energy needs is one of the underlying causes of asthma, bronchitis, pneumnia and other respiratoryillnesses among children.

Adapted from: http://www.who.int/indoorair/health_impacts/burden_global/enprint.html

5.1 Name THREE illnesses that are thought to be made worse by exposure to indoor pollution.(3)

5.2 Why do you think indoor pollution causes so many medical problems?(2)

Suggest TWO ways in which communities can try to decrease the negative effects of indoor pollution.(2)

Studies show that the average South African has a “carbon footprint” that is higher than the world average because most of our electricity isgenerated from burning coal.

5.3 State THREE ways to solve this problem.(3)

Question 6

(NSC Additional Exemplar 2008 Life Science Paper 2 Question 1)

Study the table below showing the amount of medical waste produced by three provinces over a number of years

Year

Amount of medical waste (tones)

1995

1997

1999

2001

2003

Province A 357 398 410 426 450
Province B 283 290 300 312 330
Province C 230 240 245 270 290

6.1Which province has shown the most rapid increase in the amount of medical waste produced?(1)

6.2What was the percentage increase of medical waste produced by the province named in QUESTION 2.1 over the period 1995 to 2003? Show ALL workings. (3)

6.3Give TWO negative effects of dumping medical waste.(2)

Question 7

The graph below shows the effect of different amounts of sewage discharged into a river, on the amount of dissolved oxygen in the water. Study the graph andanswer the questions that follow.

7.1.Why does the sewage discharge cause oxygen levels to decrease?(2)

7.2.Why does the minimum amount of oxygen occur some distance downstream of the point of sewage discharge?(2)

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
why and for what was five kingdom of classification of organisms introduced
SUBHIKSHA Reply
give the ans as fast as possible
SUBHIKSHA
Comment on the ozone depletion over the period of 1982 to 1996
Mpho Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Siyavula: life sciences grade 10. OpenStax CNX. Apr 11, 2012 Download for free at http://cnx.org/content/col11410/1.3
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Siyavula: life sciences grade 10' conversation and receive update notifications?

Ask