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Regarding canal system of sponges : Match the following and choose the most appropriate option:

A. ostia 1. minute pores
B. spongocoel 2. goes out through
C. osculum 3. in the body wall
D. Choanocytes 4. central cavity
E. collar cells 5. water enters through
6. line the spongocoel
7. line the canals

( A ) A-2; B-4; C-1,5; D-6; E-7
( B ) A-2; B-6; C-1,3,5; D-7; E-6
( C ) A-1,3,5; B-4; C-2; D,E-6,7
( D ) A-1,3,5; B-6; C-2; D,E-7
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(C) is the right answer.

Sponges have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste. Choanocytes or collar cells line the spongocoel and the canals.
answered Apr 2, 2014 by pady_1
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