Question Detail
Question
What is the primary feature that distinguishes a siphonostele from a protostele?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 17 defines Siphonostele as 'the type of stele with central pith surrounded by a ring of vascular tissue,' whereas Protostele is described as 'lacking a central pith'.
Hint
Think about the key structural addition that makes a siphonostele more advanced.