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Help me with my homework please :(

Saltix

Saltix

Smash Lord
Joined
Apr 12, 2008
Messages
1,092
Location
Georgia
It's AP Environmental webassign, really simple if you have your textbook, but guess what?.... Yeah, no text book. Please help :(

1. The variety of processes, including matter cycling and energy flow within ecosystems, that result from species interacting with one another in food webs is called
A.
functional diversity
B.
genetic diversity
C.
intellectual diversity
D.
ecosystem diversity
E.
species diversity


2. Mutations are
A.
always helpful
B.
always found in patterns
C.
very common events
D.
a source of new genetic material
E.
always harmful


3. For natural selection to occur, an adaptive trait
A.
must be to a physical trait
B.
must be to a physiological trait
C.
must be to a psychological trait
D.
must be to a heritable trait
E.
must not be to a heritable trait


4. Biological evolution by natural selection is when genes ____, individuals ____, and populations ____.
A.
evolve; mutate; are selected
B.
are selected; mutate; evolve
C.
mutate; evolve; are selected
D.
evolve; are selected; mutate
E.
mutate; are selected; evolve


5. From a scientific point of view, which of the following is true?
A.
Evolution leads to survival of the strongest.
B.
Evolution leads to survival of the most valuable.
C.
Organisms develop traits because they need them.
D.
Fitness is a matter of reproductive success.
E.
Evolution follows a plan of nature.


6. Biodiversity is believed to be the result of the interaction between
A.
geographic isolation and reproductive isolation
B.
speciation and extinction
C.
mass extinction and background extinction
D.
speciation and genetic engineering
E.
reproductive isolation and extinction


7. The number of different species an ecosystem contains is its
A.
speciation
B.
species evenness
C.
species niche
D.
species richness
E.
habitat


8. Which of the following is true?
A.
The higher the species richness, the lower productivity.
B.
The high the species richness, the lower the sustainability.
C.
The lower the species richness, the more the productivity.
D.
The lower the species richness, the more the sustainability.
E.
The higher the species richness, the more the sustainability.


9. Which of the following is not an example of an indicator species?
A.
trout in water with a specific temperature requirement
B.
birds that need a large forested area
C.
butterflies that use a specific plant as food
D.
frogs that take in water and air through their skin
E.
All are examples of indicator species.


10. A species in an ecosystem that plays a central role in the health of that ecosystem, and whose removal may cause the collapse of the ecosystem, is called a(n)
A.
foundation species
B.
indicator species
C.
native species
D.
keystone species
E.
specialist species
 
cutter

cutter

Smash Champion
Joined
Jun 4, 2008
Messages
2,316
Location
Getting drilled by AWPers
I have very little time right now so this will be quite brief, but I can say that the answer to #2 is D.

Mutations are both harmful and helpful. So it's neither A nor E.

Errors in DNA replication do not follow any kind of specific pattern. It is not a systematic error. Likewise, just because DNA might be exposed to mutagens doesn't necessarily mean the genome is going to develop a mutation. We can rule out B.

Our body is very good when it comes to replicating DNA. There are many checks and triggers during interphase to make sure that the more blatantly obvious mutations do not get through into mitosis. Mutations are quite rare, which include mutations that have no functional changes (silent mutations). C is not true.

This leaves us with mutations being a source for new genetic material. This is quite true. A mutation can lead to new genetic code that programs our body to make a new protein or whatever.
 
OlimarFan

OlimarFan

Smash Ace
Joined
Apr 23, 2008
Messages
790
Location
ACT, Australia
Not sure about all my answers, but at least I had a shot!

1. I don't think it's C, D or E. A doesn't make much sense for me, so I think it's B.
2. D
3. D
4. E
5. A
6. A
7. D
8. What the.... The higher the species richness, the higher productivity? It can't be A or C...I think it's E.
9. C
10. D
 
GoldShadow

GoldShadow

Marsilea quadrifolia
BRoomer
Joined
Jun 6, 2003
Messages
14,463
Location
Location: Location
Victra said:
summon:

goldshadow
altf4
altf4warrior

...

magus
magus420
Click to expand...
Never fear, GS is here!

Some of what the people above said was right, but some were wrong too. Let me know if you want to know why any of the answers are what they are.

1) A (most likely... but possibly E)
B and C don't make sense for obvious reasons. E refers to the number and density of species in an ecosystem, not necessarily what this question is asking for. D refers to diversity of ecosystems in the biosphere/earth, not diversity within ecosystems. So if I had to pick one, I'd go with A.

2) D (most likely)

3) D

4) E

5) D

6) B (most likely)
C and D are wrong for obvious reasons; all the others involve "isolation", which isn't necessarily associated with diversity (most areas on the globe are not isolated). I would say the answer is B, an equilibrium between speciation (formation of new species) and extinction (loss of old species). Isolation can cause speciation (and extinction), but you don't need isolation to produce biodiversity. Still, I could see A as being a possibility, but would pick B if I had to choose one.

7) D

8) E
Not entirely sure off the bat, but we just need to use a little multiple choice strategy to arrive at the answer. A and C say the same thing, but opposite; they can't both be right so eliminate them. B and D say the same thing, but in opposite ways also. Eliminate them. We're left with E.

9) E

10) D
 
Saltix

Saltix

Smash Lord
Joined
Apr 12, 2008
Messages
1,092
Location
Georgia
cutter said:
I have very little time right now so this will be quite brief, but I can say that the answer to #2 is D.

Mutations are both harmful and helpful. So it's neither A nor E.

Errors in DNA replication do not follow any kind of specific pattern. It is not a systematic error. Likewise, just because DNA might be exposed to mutagens doesn't necessarily mean the genome is going to develop a mutation. We can rule out B.

Our body is very good when it comes to replicating DNA. There are many checks and triggers during interphase to make sure that the more blatantly obvious mutations get through before mitosis. Mutations are quite rare, which include mutations that have no functional changes (silent mutations). C is not true.

This leaves us with mutations being a source for new genetic material. This is quite true. A mutation can lead to new genetic code that programs our body to make a new protein or whatever.
Click to expand...
Wow, you know your stuff
Bio major?

GoldShadow said:
Never fear, GS is here!

Some of what the people above said was right, but some were wrong too. Let me know if you want to know why any of the answers are what they are.

1) A (most likely... but possibly E)
B and C don't make sense for obvious reasons. E refers to the number and density of species in an ecosystem, not necessarily what this question is asking for. D refers to diversity of ecosystems in the biosphere/earth, not diversity within ecosystems. So if I had to pick one, I'd go with A.

2) D (most likely)

3) D

4) E

5) D

6) B (most likely)
C and D are wrong for obvious reasons; all the others involve "isolation", which isn't necessarily associated with diversity (most areas on the globe are not isolated). I would say the answer is B, an equilibrium between speciation (formation of new species) and extinction (loss of old species). Isolation can cause speciation (and extinction), but you don't need isolation to produce biodiversity. Still, I could see A as being a possibility, but would pick B if I had to choose one.

7) D

8) E
Not entirely sure off the bat, but we just need to use a little multiple choice strategy to arrive at the answer. A and C say the same thing, but opposite; they can't both be right so eliminate them. B and D say the same thing, but in opposite ways also. Eliminate them. We're left with E.

9) E

10) D
Click to expand...
I went with the majority of your answers, and ended up getting a 90 on the assignment; The way my teacher has things set up, we cannot see what questions we got incorrect. I believe it was #1, but I can't be positive
I do appreciate the help!

~N9NE~ said:
http://tinyurl.com/yzhv5px

^ all the information you need
Click to expand...
thanks for the laugh
I googled some things, but the questions are worded to be read right out of the textbook
 
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