Rhizophores are formed in

The kidney-shaped covering of sorus in $Dryopteris$ is called:

Spores with chloroplasts are present in:

In which plants are heterosporous conditions found,and what structures do they produce?

The stele is arranged in the form of a '$C$' in which portion of the fern plant $(Dryopteris)$?

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: