<< Chapter < Page Chapter >> Page >

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

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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natural sciences grade 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11050/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natural sciences grade 8' conversation and receive update notifications?

Ask