Water Quality B/C

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Re: Water Quality B/C

Postby PacificGoldenPlover » February 23rd, 2014, 3:29 pm

I have.
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Re: Water Quality B/C

Postby darkdeserthighway » February 24th, 2014, 12:44 pm

PacificGoldenPlover wrote:I have.


Just out of curiosity, in what context?
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Re: Water Quality B/C

Postby alczha » February 24th, 2014, 4:58 pm

If my team doesn't make a hydrometer, will we get disqualified? One of my friends said that his hydrometer broke right before the competition and he got dq'd. Now, I'm not sure if that's true or not, but is that supposed to happen?
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Re: Water Quality B/C

Postby cupcakegirl » February 24th, 2014, 5:09 pm

alczha wrote:If my team doesn't make a hydrometer, will we get disqualified? One of my friends said that his hydrometer broke right before the competition and he got dq'd. Now, I'm not sure if that's true or not, but is that supposed to happen?

No....I've seen many teams not bring a salinometer and no one has ever gotten DQ'd. Your friend should've just been allowed to guess on those questions and be ranked normally....
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Re: Water Quality B/C

Postby fozendog » February 24th, 2014, 6:20 pm

cupcakegirl wrote:
alczha wrote:If my team doesn't make a hydrometer, will we get disqualified? One of my friends said that his hydrometer broke right before the competition and he got dq'd. Now, I'm not sure if that's true or not, but is that supposed to happen?

No....I've seen many teams not bring a salinometer and no one has ever gotten DQ'd. Your friend should've just been allowed to guess on those questions and be ranked normally....

Yeah, you shouldn't be DQ'd, but it would be useful to just make a simple one out of a straw and some clay so you can get those points. Max. time to construct and calibrate with 0%, 5%, and 10% solutions would be 45 minutes.
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Re: Water Quality B/C

Postby megan » February 24th, 2014, 6:40 pm

Sorry to intrude, but I recently went to an invitational and encountered a question that's a bit puzzling. How would you answer this:

Q: Which of the organisms below (a-e) has a symbiotic relationship with coral?

a. gorgonia
b. long-spined black sea urchin
c. hard coral
d. pencil urchin
e. crown of thorns starfish

The only symbiotic relationship I know of involving coral is between zooxanthallae and coral. What are your thoughts?
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Re: Water Quality B/C

Postby silentsage » February 25th, 2014, 3:52 pm

megan wrote:Sorry to intrude, but I recently went to an invitational and encountered a question that's a bit puzzling. How would you answer this:

Q: Which of the organisms below (a-e) has a symbiotic relationship with coral?

a. gorgonia
b. long-spined black sea urchin
c. hard coral
d. pencil urchin
e. crown of thorns starfish

The only symbiotic relationship I know of involving coral is between zooxanthallae and coral. What are your thoughts?

Well, you are correct in your statement, but as none of these options are zooxanthellae, I would likely say crown of thorns. This is not a symbiotic relationship, as the definition would be with zooxanthellae, it would be a mutualism/predation species interaction. They prey on corals, allowing for diversification, but this would hardly be symbiotic.
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Re: Water Quality B/C

Postby darkdeserthighway » February 25th, 2014, 3:58 pm

alczha wrote:If my team doesn't make a hydrometer, will we get disqualified? One of my friends said that his hydrometer broke right before the competition and he got dq'd. Now, I'm not sure if that's true or not, but is that supposed to happen?


That shouldn't happen. It is very easy to build a hydrometer/salinometer though, and you should build one to help benefit your performance/placing in competition. It doesn't count that much towards your score, but every point is useful. Check the science olympiad website to find resources for building a salinometer!
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Re: Water Quality B/C

Postby colorado mtn science » February 25th, 2014, 4:20 pm

CulturallyScientific wrote:Just curious, but has anyone out there seen tests with scientific names (genus/family, etc.) of organisms not listed in the rules?


The rules specifically say that you need common names only, but still there are these people called regionals event supervisors that don't read the rules carefully.

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Re: Water Quality B/C

Postby colorado mtn science » February 25th, 2014, 4:23 pm

megan wrote:Sorry to intrude, but I recently went to an invitational and encountered a question that's a bit puzzling. How would you answer this:

Q: Which of the organisms below (a-e) has a symbiotic relationship with coral?

a. gorgonia
b. long-spined black sea urchin
c. hard coral
d. pencil urchin
e. crown of thorns starfish

The only symbiotic relationship I know of involving coral is between zooxanthallae and coral. What are your thoughts?


The definition of symbiosis is a relationship between two species where one species benefits. This includes parasitism (not sure about predation, though), so c-o-t starfish might work (p.s. don't always trust inviational tests).

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Re: Water Quality B/C

Postby PacificGoldenPlover » February 25th, 2014, 10:37 pm

darkdeserthighway wrote:
PacificGoldenPlover wrote:I have.


Just out of curiosity, in what context?


Tests I have written for invitationals. Personally, I like to stray a bit from the rules for the following reason: it helps identify the teams who have really gone out of their way to learn stuff about both coral reefs and estuaries (especially estuaries since "technically" you aren't required to really know any scientific names for organisms living there).

For example, on one invitational test, I asked what genus contains the symbiotic zooxanthallae. Technically, that's not allowed to be asked. But really, we're talking about by far the most important genus in coral reefs. Anyone who has done more than the most cursory study of reefs should have run across this genus (Symbiodinium). If not, all I can say is: you need to study more. This really isn't that hard to find. Get a good coral reef book. If you use wikipedia on zooxanthallae, it redirects you to this genus.

Same thing with the estuaries. I will check to see if you've done your research on mangroves, on cordgrass, etc. If you can't pick out their genus names from a multiple choice question, to me it seems likely that you have not really studied them fully.

Summary of my rant: When I write tests, I try and differentiate the teams that treat the rules as a boundary, and those who use it as a jumping-off point into the REAL marine biology, oceanography, etc. That's what the 5% of questions that I write that are outside the rules are for.
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Re: Water Quality B/C

Postby darkdeserthighway » February 26th, 2014, 6:52 pm

Tests I have written for invitationals. Personally, I like to stray a bit from the rules for the following reason: it helps identify the teams who have really gone out of their way to learn stuff about both coral reefs and estuaries (especially estuaries since "technically" you aren't required to really know any scientific names for organisms living there).

For example, on one invitational test, I asked what genus contains the symbiotic zooxanthallae. Technically, that's not allowed to be asked. But really, we're talking about by far the most important genus in coral reefs. Anyone who has done more than the most cursory study of reefs should have run across this genus (Symbiodinium). If not, all I can say is: you need to study more. This really isn't that hard to find. Get a good coral reef book. If you use wikipedia on zooxanthallae, it redirects you to this genus.

Same thing with the estuaries. I will check to see if you've done your research on mangroves, on cordgrass, etc. If you can't pick out their genus names from a multiple choice question, to me it seems likely that you have not really studied them fully.

Summary of my rant: When I write tests, I try and differentiate the teams that treat the rules as a boundary, and those who use it as a jumping-off point into the REAL marine biology, oceanography, etc. That's what the 5% of questions that I write that are outside the rules are for.


I understand your logic now, that's cool. So you're basically testing to see how in-depth the knowledge is.
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Re: Water Quality B/C

Postby PacificGoldenPlover » February 26th, 2014, 6:59 pm

Essentially.
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Re: Water Quality B/C

Postby PicturePerfect » February 26th, 2014, 7:32 pm

colorado mtn science wrote:
megan wrote:Sorry to intrude, but I recently went to an invitational and encountered a question that's a bit puzzling. How would you answer this:

Q: Which of the organisms below (a-e) has a symbiotic relationship with coral?

a. gorgonia
b. long-spined black sea urchin
c. hard coral
d. pencil urchin
e. crown of thorns starfish

The only symbiotic relationship I know of involving coral is between zooxanthallae and coral. What are your thoughts?


The definition of symbiosis is a relationship between two species where one species benefits. This includes parasitism (not sure about predation, though), so c-o-t starfish might work (p.s. don't always trust inviational tests).


I believe that symbiosis can also include relationships where both species benefit--for example, mutualism.

Also, for my own questions:
Which of these tropical locations is NOT known for its coral reefs?
a. Brazil
b. Caribbean Sea
c. Northern Australia
d. Southeast Asia

In estuaries, most organisms are
a. stenohaline
b. euryhaline
c. metahaline
d. mixohaline
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Re: Water Quality B/C

Postby PacificGoldenPlover » February 26th, 2014, 7:49 pm

The answer to your first question is Brazil. Despite being in a tropical location, no reefs form because the massive Amazon and Orinoco rivers deliver tons of sediment/nutrients that discourages coral reefs from growing.


For your second question, the answer I believe is euryhaline, meaning it can tolerate a wide variety of salinities.
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