In which of the following plant group, reproductive organs are not enclosed in a layer of sterile cells?
Thallophytes are autotrophic, plant body is thallus-like and devoid of vascular tissues. Both algae and bryophytes have motile sperms and need water for fertilization. But bryophytes can be separated from algae (Thallophyta) because archegonium originated for the first time in bryophytes in the plant kingdom wherein the reproductive organs are covered by a jacket of sterile cells. In algae, sex organs are non-jacketed and unicellular. Hence the correct option is B.