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Natural sciences

Grade 8

Environment interactions

Module 34

The role of plants in an ecosystem

Activity:

To identify the role of plants

[lo 2.4]

  • Complete the table by indicating either the description or the function. Complete the column to the right by pasting in some of the sketches (from the page with sketches) in the right place.
FUNCTION DESCRIPTION SKETCH
Nutrition
Air filter
Birds build nests, insects lay eggs, predators and prey take cover here.
Camouflage
Soil erosion is prevented and humidity is retained.
Soil is enriched.
  • Write 270 words on the role of plants in ecosystems.

Assessment of ROLE IDENTIFICATION

Were you able to distinguish basic roles?

[LO 2.4]

Activity:

To discuss the role of animals in ecosystems

[lo 2.2; lo 2.4; lo 3.2]

  • Complete the table by indicating either the description or the function. Complete the column to the right by either pasting in a picture or making a drawing in the right place.
FUNCTION DESCRIPTION SKETCH
Nutrition
Pollination
Mammals, birds, mice and insects distribute seeds.
The soil is enriched.

Assessment of CLASSIFICATION

Were you able to identify and classify basic ROLES? LO 2.2; LO 2.4

Advantages and Disadvantages of Animals

  • Are all animals beneficial to the environment?
  • Can animals be harmful to the environment?
  • Write significant aspects that have been named by your classmates here:

Assessment of CLASS DISCUSSION

Were you able to list disadvantages? [ LO 3.2]

Assessment

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:

  • categorises information;

2.4 applies knowledge.

LO 3: Science, Society and the Environment

The learner will be able to demonstrate an understanding of the interrelationships between science and technology, society and the environment.

This is evident when the learner:

3.2 understands sustainable use of the earth’s resources.

Memorandum

Activity: Identifying the role of plants

FUNCTION DESCRIPTION SKETCH
  • Plants store food that nourishes and keeps animals alive
Baboon or maize plant
  • Leaves absorb carbon dioxide and release oxygen
Leaf with arrows indicating direction
Protection, Homes Branches of trees
  • Bark and leaves enable insects to be unnoticeable because of the similarity of lines and spots that are developed
Moth against background of a tree trunk
Anchoring, enriching the soil Roots of plants
Plant material returns to the earth Leaves on the ground

A paragraph dealing with the role of plants

  • This should aim to provide practice in communicating through writing. The content of the previous table must be presented and expanded in a written paragraph.

Activity: Discussing the role that animals play in ecosystems

FUNCTION DESCRIPTION SKETCH
  • Animals serve as food for other animals
Lion with a zebra
  • Insects pollinate flowers, for fruit to develop
Butterfly on a flower
Dispersal of seed
  • Mammals, birds, mice and insects disperse seeds
Mouse eating a fruit
Fertiliser
  • The soil is enriched
Antelope, rock rabbit or rabbit droppings

CLASS DISCUSSION

  • Can animals harm the environment?
  • Yes – overgrazing, in particular, leads to the eradication of plants and thereby to soil erosion. Exotic animals can be harmful because of the way in which their numbers could increase in the absence of their natural enemies. This would result in the displacement of indigenous animals and even cause the eradication of specific animal and plant species.

The food pyramid

  • Green plants, herbivores, carnivores, carrion eaters.
  • Incline: the steeper the incline, the smaller the amount of energy or biomass that is lost from one level to the next.

Food chains related to a text for reading

  • E.g. twigs / organic material - ants - antlion - gecko - snake
  • Grass - locust - gecko - snake
  • Twigs / organic material - field mouse - snake

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali 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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