Question

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

Animal	Level of organisation
A. Pheretima	I. Organ level
B. Fasciola	II. Cellular level
C. Spongilla	III. Tissue level
D. Obelia	IV. Organ system level

• A. A-I, B-III, C-IV, D-II
• B. A-II, B-IV, C-III, D-I
• C. A-IV, B-I, C-II, D-III
• D. A-I, B-II, C-III, D-IV

Answer 1

The correct option is C A-IV, B-I, C-II, D-III

Spongilla belongs to phylum porifera (sponges) which exhibit cellular level of organisation.
Obelia belongs to phylum cnidaria, which generally exhibits tissue level of organisation.
Fasciola is a flatworm and hence belongs to the phylum platyhelminthes. They show organ level of organisation. Pheretima (earthworm) belongs to phylum annelida. These animals are more complex than the lower invertebrates, and exhibit organ system level of organisation.