How many of the characters given below are true for echinoderms?
| I. | An endoskeleton of calcareous ossicles |
| II. | The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. |
| III. | They are triploblastic and coelomate animals. |
| IV. | Digestive system is complete. |
| V. | Water vascular system |
| VI. | Sexual reproduction, internal fertilization, and direct development. |
1. 3
2. 4
3. 5
4. 6
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
|
Column I Feature |
Column II Phylum |
|
(a) Lateral line system (b) Water vascular system (c) Radula (d) Comb plates (e) Parapodia |
(i) Ctenophora (ii) Mollusca (iii) Echinodermata (iv) Osteichthyes (v) Annelida |
Codes
(a) (b) (c) (d) (e)
1. (i) (ii) (iii) (iv) (v)
2. (iv) (iii) (ii) (i) (v)
3. (iv) (iii) (i) (v) (ii)
4. (iii) (ii) (i) (v) (iv)
Which of the following is not an Echinoderm character?
| 1. | Exclusively marine |
| 2. | Radial symmetry in adults |
| 3. | Protostome embryonic development |
| 4. | Water vascular system |
Echinoderms are not characterized by:
| 1. | An absence of excretory system |
| 2. | Bisexual animals |
| 3. | Usually external fertilization |
| 4. | Indirect development with free swimming larva |
In which of the following animals the adults have pentamerous radial symmetry while their larvae are bilaterally symmetrical?
1. Arthropods
2. Molluscs
3. Echinoderms
4. Annelids
Ambulacral grooves are absent in the living forms of the Class
1. Crinoidea
2. Asteroidea
3. Ophiuroidea
4. Echinodermata
Retrogressive metamorphosis occurs in
1. Hemichordata
2. Cephalochordata
3. Urochordata
4. Vertebrata
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