(a) Siphonostele
(b) Amphiphloic siphonostele
(c) Protostele
(d) Ectophloic siphonostele
Ans. c
(a) Siphonostele
(b) Amphiphloic siphonostele
(c) Protostele
(d) Ectophloic siphonostele
Ans. c
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