Sometimes the prothallus of a fern gives rise to a fern plant. This is an example of:

In some of the pteridophytes and gymnosperms,the sporophylls aggregate at the apices of the main stem or its branches to form definite compact structures. These compact structures are called:

Identify the pteridophyte from the given options.

$A$ mature ligule,having a prominent basal portion,is called

Compared with the gametophytes of the bryophytes,the gametophytes of vascular plants tend to be

$A$ collection of sporangia attached to the placenta and covered by an indusium is known as: