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Science 7 - Unit 1 - Topics 4-5
Transcript of Science 7 - Unit 1 - Topics 4-5
(cc) photo by theaucitron on Flickr
(cc) photo by theaucitron on Flickr
Topic 4 :
How Organisms Interact
Living organisms make up the biotic components of the ecosystem, while non-living things make up the abiotic parts of the same ecosystem.
The Roles of Organisms in an Ecosystem
Organisms can have more than one niche and knowing the niches of an organism can help to explain why they act and interact the way they do.
All of the organisms within an ecosystem have different roles. These roles are called niches.
To determine an organism's niche, you need to identify
what it eats,
where it lives
how it interacts with the other organisms
produce food energy
for themselves and others
consume the food
made by the producers
Herbivores - eat producers (plant eating niche)
Carnivores - eat other consumers (meat eating niche)
Predators eat prey
Omnivores - eat both producers and consumers
Read page 41, and answer questions:
What to do
(a) - (d)
# 1 - 4
A food web is a combination of many different food chains in an ecosystem.
A food chain is a model that shows how energy stored in food passes from organism to organism.
A Pyramid of Numbers is a model representing the numbers of organisms consumed at each successive level of the pyramid.
please look on page 43
The Clean-Up Squads:
Scavengers are organisms that feed on dead or decaying plant or animal matter.
are different from scavengers because they do not actually eat dead material. They
grow on or in the dead or waste matter, absorbing the nutrients directly
Topic 4 Review
you need to understand that not all the energy from one level is available to the next level. Where does the energy go?
Please Read Page 38 and page 40
Do you know the three types
some videos may be loud-
all relating to decomposing
Topic 5 :
Cycles in the Environment
When organisms breathe, the gases are recycled in the air and used by other organisms.
When organisms die, the nutrients they are composed of are recycled back into the environment and used as well.
please read page 49
Carbon is necessary for all life to exist and
is recycled in the environment.
sketch this cycle
Things that place Carbon in the air:
-Burning Fossil Fuels
Things that bring carbon
back to earth:
-Dissolving in water
All living things require water to survive and this water is also recycled over and over again.
please read p. 51
Sketch this, or the picture on page 51 in your notes
The Bold words on page 51 must be written and defined in your notes.
please do so.
this is a great animation of the water cycle, see if you can catch all the parts of it...
Pollution occurs when a substance is added to the environment at such a fast rate that it
recycled in a non-damaging form.
Pollutants are substances that cause pollution.
creating acid rain...
copy this scale in your notes
Burning of Fossil fuels puts higher than normal levels of CO2 into the atmosphere and the ozone layer (which protects us from radiation) is being depleted.
Is there a risk of over using chemicals?
please read page 53 and answer the question in your notes.
is the process in which a substance builds up in a living organism
"biomagnification", where substances like mercury will increase in concentration from microorganisms, to fish, to fish eating predators like otters and loons, and to humans
please read page 54.
Paraphrase what Bioaccumulation is
(in your notes)
or Sketch the
The WRAP UP...
Topic 4-5 Wrap up
(hint- use the key terms for Question #1)