21. Know the life cycle diagram of the fern.

Frond (fern leaf)
Fiddlehead (shape of new unfolding fern leaf)
Pinnae (leaflet)
Rhizome (underground stem)
Roots (multicelluar growths)
Thallus (plant body)
Archegonium (female structure)
Antheridium (Male structure)
Rhizoids (unicellular root-like projections)