Monday 2/1/16
**Pick up a Unit 7 practice sheet from
the front table.
**Get out your venn diagram & your
review sheet from Friday.
**Turn in your Unit 6 & 7 warm-up
sheet.
Tuesday 2/2/16
Get out your Unit 7 Practice.
Unit 7 Exam TOMORROW!!
2o
3o
3o
3o
4o
2o
2o
1o
3o
3o
2o
3o
2o
1o
P
2o
P
Which organism(s) can be both a
2nd & 3rd level consumer?
Coyote, Hawk, Roadrunner
3
Which organism would be on the
bottom of the energy pyramid?
Grass & cactus
Which organism has more
energy available, grasshopper or
lizard?
Grasshopper (primary consumer)
In the nitrogen cycle, what
organisms that live in soil and on
roots fix or make usable by plants
the greatest amount of nitrogen?
Bacteria fix the most
nitrogen.
What would happen if decomposers
like earthworms or microorganisms
were removed from an ecosystem?
The cycle will be disrupted and
slowed
Write in the percentage of
energy at each level in the
food chain.
Grass
Grasshopper
Bird
Snake
100%
10%
1%
.1%
What is the role of the bird?
1o Consumer
Grass
Producer
Grasshopper
3o Consumer
Bird
2o Consumer
Snake
What would happen if the
birds were removed?
Grass
Grasshopper
Bird
The grasshoppers would
increase and the grass &
snakes would decrease
Snake
Which level provides the most energy?
Wolf
Raccoon
Grasshopper
Grass
3rd Consumer
2nd Consumer
1st Consumer
Producers
How much energy is passed to
the next level?
10%
What happens to the other 90%?
Used by the organisms at that level &
given off as heat
How does species diversity
change over time as a
result of succession?
Diversity INCREASES
What is the difference
between primary &
secondary succession?
Primary succession begins
with pioneer species
(lichens) & occurs on
barren, uninhabited land.
Pioneer species such as lichen and moss
inhabit an area after a major disturbance,
such as a volcanic eruption. Over time,
other species are found in the disturbed
area, and the number of pioneer species
decreases. Why does the number of
pioneer species decrease?
Lichens & mosses break down rock & make
soil to prepare the foundation for other
species to follow. The competition reduces the
pioneer species role.
List the descriptions in order
of ecological succession.
Barren land
Lichens & mosses appear
Grasses & small plants appear
Small trees appear
Is this an example of primary
or secondary succession?
Primary
Why does secondary
succession occur faster than
primary succession?
There is already a foundation
so fewer changes have to
occur.
Why does diversity
increase as ecological
succession progresses?
More complex species move
in and take over, displacing
the older, less complex
organisms.
Why is overfishing
detrimental to the
overgrowth of plant life?
Reduces the number of
organisms that feed on the
producers.
If a native species & a non-native
species are competitors for
resources, why is the non-native
species more likely to survive
than the native species?.
The non-native species
doesn’t have any natural
predators in the ecosystem
Otters float and sleep on forests of
kelp in the water. The kelp provides
them a place to anchor in the moving
water. The otters eat sea urchins,
which normally feed on the kelp.
What symbiotic relationship is this?
Mutualism; they both get
something good!
Fleas attach to the skin of warmblooded animals, feed on their blood,
and make the animals itch. What
symbiotic relationship is this?
Parasitism; the fleas are harming
the dog by taking nutrients from
the dog
Remoras attach themselves to the
shark’s body. They travel with the
shark and feed on the leftover food
scraps after the shark has finished its
meal. The shark is unaffected as it’s
done eating anyway. What symbiotic
relationship is this?
Commensal; only one benefits
Bortzy shoots all the bears in 2 forests. In
the first forest, everything dies as a result.
In the second forest, a couple of animals
die, but things remain mostly the same.
Which forest has higher biodiversity?
Which forest is more stable? Why?
2nd forest was affected less, therefore it
was more diverse & stable.
High diversity = more stable
In recent years, humans have interfered
with the natural balance within deer
populations in various ecosystems. The
interference includes eliminating
predators of the deer. What would be a
long-term outcome of this interference?
Less predators = more deer
There would not be enough producers to
support the increased population.
If the fossil fuels were no longer in this cycle,
what would happen with the carbon?
There would be less carbon output
because the carbon would remain in the
soil after decomposition. The whole cycle
gets disrupted!!
How would the cycle be affected if the
nitrates were removed?
The whole cycle would be disrupted and
plants would not get the nitrogen they
need.
Explain how carbon is recycled within an
ecosystem.
•
•
•
Plants convert CO2 from the atmosphere to glucose in
photosynthesis.
All living organisms convert glucose back into CO2 with cellular
respiration.
Decomposers put carbon back into the soil (fossil fuels) when they
break down dead organisms. Burning the fossil fuels releases
Carbon into the atmosphere.
Don’t lose your Unit 7 Practice…you
will turn it in for a grade tomorrow
before the exam.
STUDY!! DO YOUR BEST & MAKE ME
PROUD!! 