In ferns,sporangia are borne on the

Vascular cryptogams or seedless vascular plants are included in .......

$Nephrolepis$ is a:

Spore-bearing tracheophytes are known as:

Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
$A.$ Prothallus stage
$B.$ Meiosis in spore mother cells
$C.$ Fertilisation
$D.$ Formation of archegonia and antheridia in gametophyte.
$E.$ Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below.

Heterospory is found in