Parazoa is a taxon at the base of the phylogenetic tree of the animal kingdom and includes the most primitive forms, characterized by not having proper tissues. The phylum/phyla included in this taxon will be:

I. Porifera II. Cnidaria III. Ctenophora
 
1. Only I 2. Only II and III
3. Only I and II 4. I, II and III
Subtopic:  Phylum Porifera | Basis of Classification |
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Identify the incorrectly matched pair:

Phylum

Characteristic

1.

Porifera

Water vascular system

2.

Ctenophora

Bioluminescence

3.

Molluska

Radula

4.

Annelida

Closed circulatory system

Subtopic:  Phylum Porifera |
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Match the following list of animals with their level of organization.

Division of Labour Animal
A. Organ level i. Pheritima
B. Cellular aggregate level ii. Fasciola
C. Tissue level iii. Spongilla
D. Organ system level iv. Obelia

Choose the correct match showing division of labour with animal example:

i ii iii iv
1. B C D A
2. B D C A
3. D A B C
4. A D C B
Subtopic:  Phylum Porifera | Phylum Coelenterata | Phylum Ctenophora | Phylum Aschelminthes | Phylum Annelida | Phylum Arthropoda | Phylum Mollusca | Phylum Echinodermata | Phylum Hemichordata | General Introduction: Vertebrates & Agnatha |
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The animals belonging to all the following groups are exclusively marine except:

1. Ctenophora 2. Porifera
3. Protochordata 4. Echinodermata
Subtopic:  Phylum Porifera |
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