PHYLUM PLATYHELMINTHES - FLATWORMS - INVERTEBRATES

[LaceFlowerCookies]

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

[SU_reptile]

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 (??)

[victor]

about number 11.
I think the answer would be "statocyst"

[SU_reptile]

statocyst

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

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

[victor]

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?

[SU_reptile]

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.

[LaceFlowerCookies]

Thanks so much, you guys really helped me

[victor]

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.

[smilesfromhvn807]

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