Heteromorphic alternation of generations is found in

The leaves of pteridophytes are .....

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:

Into how many classes is the subphylum Pteridophyta divided?

The name "Walking Fern" is given because of:

The ferns in which the entire sporangium develops from a single superficial cell of the sporophyll are known as