Q.The plant of this group are adapted to live partly in water and partly above substratum and free from water

Hydrophytes are plants living in water or permanently wet places, sub-divided by how much of the plant contacts water, mud and air: free-floating (touch water/air only — Eichhornia, Pistia, Wolffia), rooted-floating (roots in mud, leaves/flowers floating — Nelumbo, Nymphaea, Potamogeton, Marsilea), submerged-floating (entirely underwater, no soil/air contact — Ceratophyllum, Utricularia), rooted-submerged (rooted, fully underwater — Hydrilla, Vallisneria, Isoetes), and amphibious/rooted-emergent (adapted to both aquatic and terrestrial life in shallow water — Ranunculus, Typha, Sagittaria); a related smaller group, hygrophytes, grow in moist shady places rather than standing water (Habenaria, mosses). Morphologically: roots may be absent, poor or well-developed depending on type, with root pockets replacing root caps in some (Eichhornia); stems are long/slender/spongy when submerged, short/thick/stoloniferous when free-floating, or rhizomatous when rooted-floating, propagating readily via runners/stolons/tubers/offsets; leaves vary from ribbon-shaped (Vallisneria) to large …