| Sycon – Scypha; Spongilla - Fresh water sponge; Euspongia - Bath sponge; Physalia -Portuguese man-of-war; Adamsia - Sea anemone; Pennatula - Sea-fan |
| 1. | Asterias | 2. | Pheretima |
| 3. | Rotifers | 4. | Pinctada |
| I: | Nematocysts for defence |
| II: | Radial symmetry |
| III: | Filter-feeding and porous bodies |
| IV: | Cellular grade of organisation |
| 1. | Alimentary canal is complete with a well-developed muscular pharynx. |
| 2. | An excretory tube removes body wastes from the body cavity through the excretory pore. |
| 3. | Sexes are separate (dioecious), i.e., males and females are distinct. |
| 4. | Often females are shorter than males. |
Identify the correct statements regarding arthropods:
| I: | All arthropods use internal fertilization |
| II: | All arthropods lay eggs |
| III: | All arthropods' embryos are segmented |
| 1. | Only II | 2. | Only III |
| 3. | Only I and II | 4. | None |
| I: | lacks a coelom |
| II: | is triploblastic |
| III: | is expected to have bilateral symmetry |
| IV: | is expected to be dorso-ventrally flattened |
Identify the incorrectly matched pair:
|
Phylum |
Characteristic |
|
|
1. |
Porifera |
Water vascular system |
|
2. |
Ctenophora |
Bioluminescence |
|
3. |
Molluska |
Radula |
|
4. |
Annelida |
Closed circulatory system |
| I. | Cartilaginous fishes have cycloid or ctenoid scales. |
| II. | An air bladder is present in bony fishes. |
| III. | Amphibians have three-chambered heart. |
| IV. | Reptiles have dermal scales. |
| V. | Birds are warm-blooded. |
| 1. | egg-laying mammal |
| 2. | vertebrate osmoconformer |
| 3. | limbless amphibian |
| 4. | pouched mammal |
| I: | All living members of the class Cyclostomata are ectoparasites on some fishes. |
| II: | Cyclostomes have a sucking and circular mouth without jaws. |
| III: | Circulation is of open type. |
| IV: | Their body is devoid of scales and paired fins. |