1. | Echinodermata | Water vascular system |
2. | Hemichordata | Stomochord |
3. | Cyclostomata | Cartilaginous jaw |
4. | Cephalochordata | Notochord persistent throughout life |
I: | Platyhelminthes |
II: | Mollusca |
III: | Annelida |
1. | Only I | 2. | Only II |
3. | Only II and III | 4. | I, II, and III |
1. | Choanocyte and helps sponges in movement of water through their canal system |
2. | Choanocyte and helps sponges in reproducing asexually under favourable conditions |
3. | Cnidocyte and helps sponges in catching their prey by paralyzing them |
4. | Colloblast and helps sponges in sticking to a surface |
a: | body bears eight external rows of ciliated comb plates, which help in locomotion. |
b: | reproduction takes place only by asexual means. |
c: | digestion is both extracellular and intracellular. |
d: | sexes are separate. |
1. | a and c only | 2. | b and d only |
3. | a, b and c only | 4. | a, b and d only |
1. | Catching food and digesting it |
2. | Exchange of gases |
3. | Excretion and Osmoregulation |
4. | Regeneration of lost body parts |
1. | Annelida | 2. | Platyhelminthes |
3. | Aschelminthes | 4. | Chordata |
1. | Sea Urchin | 2. | Sea lily |
3. | Brittle star | 4. | Brain coral |
Statement 1: | Hemichordates were earlier considered as a sub-phylum under Phylum Chordata but are now placed separately in a phylum under non-Chordata. |
Statement 2: | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to the notochord. |
1. | Both Statement 1 and Statement 2 are correct but Statement 2 does not explain Statement 1. |
2. | Statement 1 is correct and Statement 2 is incorrect. |
3. | Both Statement 1 and Statement 2 are incorrect. |
4. | Both Statement 1 and Statement 2 are correct and Statement 2 explains Statement 1. |