Q.

Which of the following organisms lacks specific respiratory, excretory and digestive systems?

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a

Nereis

b

Apis

c

Echinus

d

Leucosolenia

answer is D.

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Detailed Solution

Leucosolenia (Porifera) lacks specific respiratory, excretory and digestive structures. It exhibits cellular level of organisation.Echinus (Echinodermata) has a complete digestive system.Apis (Arthropoda) has respiratory (trachea), excretory (Malpighian tubules) and digestive system.Nereis (Annelida) has specific excretory organs (nephridia) and digestive system.
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