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Natural sciences

Grade 8

Environment and interactions

Module 36

Special food relationships

Activity:

To be able to identify special food relationships and to be able to describe them from examples

[lo 2.4]

Besides the typical predator and prey relationships there are certain relationships that are very interesting and special, especially because they are also linked to survival strategies.

SYMBIOSIS is the co-existence of two different organisms.

This relationship of co-existing can differ with regard to the amount of advantage or disadvantage gained by each party.

Commensalism

  • One of the organisms benefits and the other one is not really affected.

Mutualism

  • Both organisms benefit.

Parasitism

  • One organism definitely benefits at the expense of the other one.

Complete the table by pasting one of the sketches from the sketch sheet next to each of the relationships. Paste in some of your own examples as well. Describe the characteristics of the relationship in the right-hand column.

Special Food Relationships

EXAMPLES DESCRIPTION OF RELATIONSHIP
Mutualism
Parasitism
Commensalism

Assessment of CUTTING AND PASTING of SYMBIOSIS SKETCHES

Were you able to identify and describe SYMBIOSIS TYPES correctly?

[LO 2.4]

Activity:

To do research on parasitism and to represent the results graphically on a poster

[lo 1.1; lo 1.2; lo 1.3]

Work in groups of four and collect examples of the different kinds of parasites that use both humans and animals as hosts.

  • Explain the following:

1. the parasite and the host, and the nature of their relationship

2. symptoms that can be detected in the host

3. how to combat the parasite

  • Divide the different parts of the assignment among the members of the group so that each one will be responsible for a certain part.
  • Remember that plants also have parasites – find out more about this and use at least one plant as an example. Present the poster to the rest of the class.

Assessment of GROUP WORK, RESEARCH AND COMMUNICATION on PARASITES

Were you able to contribute to the group’s research work, and communicate it to the

rest of the class? LO 1.1 ; LO 1.2; LO 1.3

Assessment

LO 1: Scientific investigations:

The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

This is evident when the learner:

  • plans investigations;
  • conducts investigations and collects data;
  • evaluates data and communicates findings.

LO 2: Constructing Science Knowledge:

The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

This is evident when the learner:

2.4 applies knowledge.

Memorandum

Activity: Special food relationships

Mutualism : bird and flower: The bird obtains food (advantage), flower is pollinated (advantage).

Parasitism : tick on horse: The tick obtains food (advantage), horse loses blood (disadvantage).

Commensalism : Cattle and birds: Cattle dislodge and carry ticks that occur on the grass, providing food for the birds while the cattle remain unaffected.

Sharks and small fish: The fish eat the remains of the food consumed by the sharks while the sharks remain unaffected.

Activity: Researching parasitism

  • Assess the learner's attempt in terms of the three assessment standards 1.1 (planning), 1.2 (collecting data), and 1.3 (interpretation and communication).

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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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