Question

During which period did the first vascular plants appear? A. Cambrian B. Ordovician C. Silurian D. Devonian

Answer 1

Psilopsids were he first vascular plants which were in C. Silurian period!

Answer 2

C. Silurian
The first jawed fishes and uniramians (like insects, centipedes and millipedes) appeared during the Silurian (over 400 million years ago). First vascular plants (plants with water-conducting tissue as compared with non-vascular plants like mosses) appear on land (Cooksonia is the first known).