Monday 2/1/16Monday 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 2/2/16Tuesday 2/2/16

Get out your Unit 7 Practice.Unit 7 Exam TOMORROW!!

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3o 2o

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Which organism(s) can be both a 2nd & 3rd level consumer?Coyote, Hawk, Roadrunner

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.

100%

BirdGrass Grasshopper Snake

10% 1% .1%

What is the role of the bird?

BirdGrass Grasshopper Snake

Producer

1o Consumer

2o Consumer

3o Consumer

What would happen if the birds were removed?

The grasshoppers would increase and the grass & snakes would decrease

BirdGrass Grasshopper Snake

Which level provides the most energy?

Grass

Grasshopper

Raccoon

Wolf

Producers

1st Consumer

2nd Consumer

3rd Consumer

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 landLichens & mosses appear

Grasses & small plants appearSmall 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 warm-blooded 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 deerThere 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!!