Cycas and Azolla plants are associated with

The kingdom characterized by the presence of a rigid cell wall and the formation of an embryo is ......... .

What is the carrier of the male gamete in Pinus, Marchantia, Mango, Chara, and Funaria, respectively?
[where $A = \text{Pollen tube}$, $B = H_2O$]

Cycas and Adiantum resemble each other in having

Both gymnosperms and angiosperms bear seeds,then why are they classified separately?

$A$ motile stage is not found in the life cycle of..........