Water Quality B/C

Test your knowledge of various Science Olympiad events.
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SciolyMaster
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Re: Water Quality B/C

Post by SciolyMaster » September 17th, 2020, 5:36 pm

Krish2007 wrote:
September 17th, 2020, 11:41 am
SciolyMaster wrote:
September 11th, 2020, 8:41 pm
Alright, I guess I'll continue:

1. What organism on the species list protects itself using toxins known as asterosaponins?
2. Most "red tides" are caused by members of what group of algae?
3. The feeding mechanism of parrotfish is an important contributor to what general process?
1) Crown of Thorns Starfish
2) Rhodophyta (red algae)?
3) Coral reef growth by eating seaweed on rocks.

I apologize in advance if these answers are all completely wrong, I’m still pretty new to the event, and haven't done that much on it.
1. correct
2. you would think so, but it's actually dinoflagellates
3. their feeding mechanism actually scrapes off bits of the reef, which is called bioerosion
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Re: Water Quality B/C

Post by Krish2007 » September 19th, 2020, 9:28 am

About your 3rd question, is this https://www.youtube.com/watch?v=rI9yUJl ... nel=TED-Ed video talking about another type of parrotfish, because it is what I based my answer off of. Anyways,
1) True or false: Giant Clams have zooxanthellae in parts of their tissue to provide nutrition.
2) Briefly explain what zooxanthellae are and their importance to coral reefs.
3) What phosphorus mineral is always needed to test for phosphorus (you need to convert other forms of phosphorus to this mineral)?
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Re: Water Quality B/C

Post by AstroClarinet » September 19th, 2020, 9:52 am

Krish2007 wrote:
September 19th, 2020, 9:28 am
1) True or false: Giant Clams have zooxanthellae in parts of their tissue to provide nutrition.
2) Briefly explain what zooxanthellae are and their importance to coral reefs.
3) What phosphorus mineral is always needed to test for phosphorus (you need to convert other forms of phosphorus to this mineral)?
1) True

2) Zooxanthellae are photosynthetic algae (dinoflagellates) which have a endosymbiotic relationship with hermatypic corals; they provide nutrients for corals, helping coral reefs grow.

3) Orthophosphate
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Re: Water Quality B/C

Post by Krish2007 » September 19th, 2020, 11:36 am

AstroClarinet wrote:
September 19th, 2020, 9:52 am
Krish2007 wrote:
September 19th, 2020, 9:28 am
1) True or false: Giant Clams have zooxanthellae in parts of their tissue to provide nutrition.
2) Briefly explain what zooxanthellae are and their importance to coral reefs.
3) What phosphorus mineral is always needed to test for phosphorus (you need to convert other forms of phosphorus to this mineral)?
1) True

2) Zooxanthellae are photosynthetic algae (dinoflagellates) which have a endosymbiotic relationship with hermatypic corals; they provide nutrients for corals, helping coral reefs grow.

3) Orthophosphate
All 3 are correct.
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Re: Water Quality B/C

Post by AstroClarinet » September 19th, 2020, 1:54 pm

1. Trepanging is the harvesting of which organism?
2. If populations of crown of thorns starfishes are kept under control, how do they help corals?
3. Name an organism other than coral which builds reefs.
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Re: Water Quality B/C

Post by SilverBreeze » September 20th, 2020, 9:30 pm

Krish2007 wrote:
September 19th, 2020, 9:28 am
About your 3rd question, is this https://www.youtube.com/watch?v=rI9yUJl ... nel=TED-Ed video talking about another type of parrotfish, because it is what I based my answer off of.
Actually both answers are correct! No parrotfish eats only coral, but many species can eat a lot of it. Most parrotfish are also herbivorous, so they both help clear out competing algae and contribute to bioerosion (a lot of beach sand in some areas is parrotfish poop).

EDIT: Whoops, forgot
AstroClarinet wrote:
September 19th, 2020, 1:54 pm
1. Trepanging is the harvesting of which organism?
2. If populations of crown of thorns starfishes are kept under control, how do they help corals?
3. Name an organism other than coral which builds reefs.
1. sea cucumber
2. they eat corals indiscriminately, helping maintain biodiversity by allowing slower-growing species compete with faster-growing ones more easily.
3. worms/sponges

Next set of questions in case I go offline and forget:
1. From where does the Nassau Grouper get the first word in its name?
2. What is the average salinity of the ocean, to two significant figures?
3. Describe the three stages of atoll development
Last edited by SilverBreeze on September 20th, 2020, 9:41 pm, edited 1 time in total.
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Re: Water Quality B/C

Post by AstroClarinet » September 21st, 2020, 5:00 am

SilverBreeze wrote:
September 20th, 2020, 9:30 pm
AstroClarinet wrote:
September 19th, 2020, 1:54 pm
1. Trepanging is the harvesting of which organism?
2. If populations of crown of thorns starfishes are kept under control, how do they help corals?
3. Name an organism other than coral which builds reefs.
1. sea cucumber
2. they eat corals indiscriminately, helping maintain biodiversity by allowing slower-growing species compete with faster-growing ones more easily.
3. worms/sponges
Correct!
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Re: Water Quality B/C

Post by SilverBreeze » September 26th, 2020, 1:10 pm

SilverBreeze wrote:
September 20th, 2020, 9:30 pm
Next set of questions in case I go offline and forget:
1. From where does the Nassau Grouper get the first word in its name?
2. What is the average salinity of the ocean, to two significant figures?
3. Describe the three stages of atoll development
Revive?
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Re: Water Quality B/C

Post by SciolyMaster » September 26th, 2020, 3:13 pm

SilverBreeze wrote:
September 20th, 2020, 9:30 pm
Next set of questions in case I go offline and forget:
1. From where does the Nassau Grouper get the first word in its name?
2. What is the average salinity of the ocean, to two significant figures?
3. Describe the three stages of atoll development
1. The city of Nassau in the Bahamas, I assume
2. 35 ppt
3. First a fringing reef forms around a volcanic island, then it becomes a barrier reef as the island subsides, and finally it becomes an atoll once the original island is completely submerged
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Re: Water Quality B/C

Post by SilverBreeze » September 26th, 2020, 3:24 pm

All correct!
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