Question

2. Examine some of the echinoderm specimens. Be able to recognize a sea star, sea urchin, and sea cucumber. Echinoderms are characterized by their "spiny skin". What are these spines made of, and from what do they arise? Instead of mouth Sponge have ting pores called Ostia in their outer mooth walls through water is drops cells in the walls filter foot from the water as the where is through 3. We associated radial symmetry with ancient phyla such as Cnidaria, however echinoderms also exhibit a Pumpul, through form of radial symmetry. What evidence suggests that this trait in echinoderms was secondarily derived? the body o blocs The trait is secondarly derived because the large of echniedoms exhibit bilateral symmetry 4. Sea stars utilize a water vascular system for locomotion, respiration and food capture. Describe the water vascular system. What is the name of the sieve that regulates water flow between the organism and the environment? 5. Examine the slide of the starfish ray (#121 or #122). On the back of this paper, make a drawing and label the coloem, radial canal, and a tube foot. PHYLUM CHORDATA 6. What four features define the phylum Chordata? 7. How are tunicates and lancelets different than most other chordates? Jual of this maner, make a drawing and label as many
question 4

Answer 1

It belongs to phylum Echinoderms

Ex:sea stars, sea urchins

Water vascular system

The water vascular system is essentially a system of fluid-filled canals that extend along each of the body regions and its external projections called tube feet.

Functions of the water vascular system is to use water pressure to mediate movement and assist in feeding. It also carries out respiratory, excretory, and some circulatory functions within the animal.

Madreporite is also called as seive tube. It regulates the in flow of water into organism and environment