Multiple choice The three main groups of cryptogams are thallophyta, bryophyta and _______. cryptogams spermatophyta gymnosperm pteridophyta Reveal answer Fill a bubble to check yourself D Correct answer Explanation The three main groups of cryptogams (flowerless, seedless plants) are Thallophyta (simple plants like algae), Bryophyta (mosses and liverworts), and Pteridophyta (ferns). They all reproduce via spores rather than seeds.