Question

Name the common ancestor of a) cycads and dicots b) coniferns and ferns

Answer 1

The common ancestor of cycads and dicots are seed ferns.
And the common ancestors of coniferns and ferns are trimerophytes.

Answer 2

Seed ferns and trimerophytes are the answers.

Explanation:

• Cycads are a historic institution of vascular vegetation that has been as soon an outstanding aspect of the world's flora.
• The dicotyledons additionally called dicots (or, greater rarely, dicotyls), are one of the corporations into which all of the flowering vegetation (angiosperms) have been, formerly, divided.

trimerophytes A institution of extinct land vegetation that flourished throughout the latter a part of the Devonian period, participants of which developed into the ancestors of seed vegetation and ferns.

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