Multiple choice

In the rachis of Cycas, the exarch bundles are

  1. more of the centrifugal xylem

  2. more of the centripetal xylem

  3. equal amount of centrifugal and centripetal xylem

  4. variable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Cycas and other cycads, the exarch vascular bundles in the rachis contain predominantly centripetal xylem, which develops inward toward the center of the stem. This is characteristic of these ancient gymnosperms, where the xylem matures from the outside inward (exarch) but the majority of the tissue develops centripetally. Centrifugal xylem development is more common in other plant groups.

Keep practicing — related questions