Multiple choice

Which of the following stele, evolved first and is the most primitve type?

  1. Haplostele

  2. Siphonostele

  3. Solenostele

  4. Amphiphloic siphonostele

  5. Protostele
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The earliest vascular plants had stems with a central core of vascular tissue. This consisted of a cylindrical strand of xylem, surrounded by a region of phloem. Around the vascular tissue there might have been an endodermis that regulated the flow of water into and out of the vascular system. Such an arrangement is termed a protostele.

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