| 1. A sponge | 2. A Cnidarian | 
| 3. A Ctenophore | 4. A flatworm | 
| A: | I is found in all the molluscs. | 
| B: | II is a cavity used for egestion, excretion and respiration. | 
| 1. | Only I is correct | 
| 2. | Only II is correct | 
| 3. | Both I and II are correct | 
| 4. | Both I and II are incorrect | 
| A | B | C | D | E | F | |
| 1. | Blood vessel | Nerve cord | Trachea | Spiracles | Crop | Hearts | 
| 2. | Blood vessel | Nerve cord | Trachea | Spiracles | Oesophagus | Hearts | 
| 3. | Nerve cord | Blood vessel | Trachea | Spiracles | Crop | Ostia | 
| 4. | Nerve cord | Blood vessel | Stomo- chord  | 
			Ostia | Oesophagus | Spiracles | 
| I: | It is a hydraulic system used by echinoderms for locomotion, food and waste transportation, and respiration. | 
| II: | The system is composed of canals connecting numerous tube feet. | 
| 1. Ascidia | 2. Amphioxus | 
| 3. Petromyzon | 4. Exocoetus | 
The figure shows the mouth of a chordate. It can easily be seen that:
| I. The mouth is circular | II. Jaw is absent. | 
| 1. Ascidia | 2. Amphioxus | 
| 3. Petromyzon | 4. Exocoetus | 
| Column I | Column II | ||
| A. | Spongilla | P. | Sea-fan | 
| B. | Euspongia | Q. | Brain coral | 
| C. | Gorgonia | R. | Fresh Water sponge | 
| D. | Meandrina | S. | Sea-pen | 
| E. | Pennatula | T. | Bath sponge | 
| A | B | C | D | E | |
| 1. | T | R | P | Q | S | 
| 2. | R | T | P | Q | S | 
| 3. | T | R | Q | S | P | 
| 4. | R | T | S | P | Q | 
| 1. | Cnidaria | 2. | Aschelminthes | 
| 3. | Hemichordata | 4. | Echinodermata |