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Match the following list of animals with their level of organisation:

A. Organ Level                           p. Pheretima 
B. Cellular aggregate level        q. Fasciola 
C. Tissue level                           r. Spongilla 
D. Organ system level               s. Obelia      
 

Option: 1

A-s , B-r , C-p , D-q 
 


Option: 2

A-s , B-q , C-r , D-p
 


Option: 3

A-q , B-s , C-r , D-p 


Option: 4

A-q , B-r , C-s , D-p


Answers (1)

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The cellular level of organization: 

  • It is the most primitive type of organization and is suited for sedentary life-forms, Phylum Porifera shows this type of organisation. Example :Spongilla

Tissue level of organization: 

  • It is seen in animals belonging to Phylum Coelenterata and Phylum Ctenophora Example :Obelia

Organ level of organization: 

  • Phylum Platyhelminthes shows organ level of organisation Example: Fasciola

Organ system 

  • It is seen from Phylum Aschelminthes to Chordates

Hence,

Spongilla belongs to the phylum Porifera. It has cellular level of body organization. Obelia belongs to the phylum Cnidaria. It has tissue level of body organization. Fasciola belongs to the phylum Platyhelminthes. It has organ level of body organization. Pheretima belongs to the phylum Annelida. It has organ system level of body organization.
 

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