Animal Kingdom Question 323
Question: Animals devoid of respiratory, excretory and circulatory organs are
[Haryana PMT 1993; DPMT 2002]
Options:
A) Tapeworms
B) Sponges
C) Threadworms
D) Liver Fluke
Show Answer
Answer:
Correct Answer: B
Solution:
Tapeworms, thread worms and liver fluke belong to phylum Platyhelminthes.
They have protonephridia or flame cells as excretory organs. Respiration is both aerobic and anaerobic. Circulatory organs are well developed.
Sponges do not have respiratory organs because they have a porous body.
They neither have excretory organs and circulatory organs as circulation occurs by means of canal system. So, the correct answer is ‘Sponges’.
BETA
