Characters of a marine invertebrate is given.
- Spiny skinned body
- Presence of water vascular system.
a) Identify and write the phylum.
b) Write any two functions ofwater vascular system among them.

Diagnostic character of echirioderms is the presence of a. Water vascular system b. Spiny skin c. exclusively marine d: All the above.

Write one difference between following:pairs i. Canal system and water vascular system ii. Protochordata and vertebrata iii.Cockroach and crab

While doing anatomy practical, students observe ten following characters: (i) Undifferentiated ground tissue. (ii) Numerous vascular bundles and are scattered. (iii) Sclerenchymatous hypodermis. (iv) Presence of bundle sheath. Identify the material. Write any one example of a plant having such characters.