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PHYLUM PLATYHELMINTHES - FLATWORMS - INVERTEBRATES

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PHYLUM PLATYHELMINTHES - FLATWORMS - INVERTEBRATES

Postby LaceFlowerCookies » Fri Dec 15, 2006 6:02 pm

Hey guys-

I have a few questions that I was wondering if you could help me out with...

1: True or false- Flatworms are the most complicated and complex of the worm groups.
2: A situation where a living thing lives off another living thing called a host is ___.
3: A flatworm reproduces by ___.
4: The Planarian head has ___.
5: True or false- A flatworm has one opening to take in food and get rid of wastes.
6: A tapeworm has what kind of symmetry?
7: An example of an Echinoderm is ___.
8: The Starfish is specially designed to eat Clams or mussels because it can turn its _________ inside out.
9: The Nervous System of a starfish consists of ___.
10: A Starfish can reproduce ___.
11: At the end of each arm of the starfish there is a(n) ___.


Thanks :wink:
"Why do you swim?" asked one young boy. "Because," answered Oren Azrad, who starting swimming...at the age of 12, "my parents wanted me to take up a sport that would tire me out at the end of the day. Ten years later, it's still tiring."
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Postby SU_reptile » Fri Dec 15, 2006 10:18 pm

1: True or false- Flatworms are the most complicated and complex of the worm groups.
As far as I know they are the most primitive ones so false
2: A situation where a living thing lives off another living thing called a host is ___.

Parasitism
3: A flatworm reproduces by ___.

Bisexual reproduction (??), cross-fertilization (??). They are hermaphrodytes
4: The Planarian head has ___.

a pair of ocelli
5: True or false- A flatworm has one opening to take in food and get rid of wastes.

true - except tapeworms that are osmotrophs
6: A tapeworm has what kind of symmetry?

Bilateral symmetry
7: An example of an Echinoderm is ___.

sea urchin, sea-cucumber, brittle-star, starfish, sea-lily
8: The Starfish is specially designed to eat Clams or mussels because it can turn its _________ inside out.

Stomach
9: The Nervous System of a starfish consists of ___.

ectoneural, hiponeural and endoneural part. Each of them consists of neural ring (surrounding bowel) with radially organised neural stems.
10: A Starfish can reproduce ___.

Sexually and vegetatively
11: At the end of each arm of the starfish there is a(n) ___.

tube feet (??)
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Postby victor » Sat Dec 16, 2006 12:31 pm

about number 11.
I think the answer would be "statocyst"
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Postby SU_reptile » Sat Dec 16, 2006 8:14 pm

statocyst


Is it? I couldn't find it in my textbook. Thanks too :wink:

NEW INFO: I have just found some info that at the tip of every arm there is an eyespot http://faculty.washington.edu/chudler/invert.html
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Postby victor » Sun Dec 17, 2006 11:52 am

Umm....it's kinda like stinging organ for starfish's arm. I remembered that my lab assistans said that it's statocyst.

Umm...about number 3. Are you trying to say that the hermaphrodytes, is a mean of using gravid proglotid?
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Postby SU_reptile » Sun Dec 17, 2006 5:33 pm

Um I am sorry, but I am not acquainted with zoological terminology very well. Hermaphrodites are organisms that may produce male and female gametes. They are males and females in one organism.
Frankly saying I am not sure what question 3 demands so I wrote what I know.
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Postby LaceFlowerCookies » Mon Dec 18, 2006 4:24 pm

Thanks so much, you guys really helped me ;)
"Why do you swim?" asked one young boy. "Because," answered Oren Azrad, who starting swimming...at the age of 12, "my parents wanted me to take up a sport that would tire me out at the end of the day. Ten years later, it's still tiring."
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Postby victor » Tue Dec 19, 2006 11:20 am

SU_reptile wrote:Um I am sorry, but I am not acquainted with zoological terminology very well. Hermaphrodites are organisms that may produce male and female gametes. They are males and females in one organism.
Frankly saying I am not sure what question 3 demands so I wrote what I know.


Umm, what I know is that tape worm is segmented and each segment is called as proglotid. In tapeworms, there're three types of proglotids, which are immature proglotid, mature proglotid, and gravid proglotid.
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Postby smilesfromhvn807 » Fri Jan 05, 2007 6:23 pm

you must be from one of those jubilee online academies. i have the same questions!! are you with morningstar?


1. False
2. Parasitic
3. Budding
4. Eyes and a brain
5. true
6. bilateral symmetry
7. sea urchin
8. pyloric stomache
9. a nerve ring with radial nerves on each arm
10. asexually and sexually
11. Madreporite
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