Q.Name land plants that can tolerate sea (marine) salinity.

Mesophytes are plants of habitats where water is neither excessive, as for hydrophytes, nor scarce, as for xerophytes, but moderate and fairly reliable through the year. Most ordinary garden plants, non-arid trees, and cultivated crop plants belong here, since typical farmland or garden soil offers a balanced water regime rather than either extreme. Structurally, mesophytes sit between the two extremes: a moderately developed (neither reduced nor unusually extensive) root system, a cuticle present but not heavily thickened, stomata distributed on both surfaces or concentrated on the lower surface, and normally developed xylem and mechanical tissue, since — unlike a hydrophyte — a mesophyte genuinely depends on root uptake and internal water transport, and — unlike a xerophyte — it faces no chronic drought stress requiring extra reinforcement. Mesophytes can usefully be thought of as the structural "default," with both hydrophyte and xerophyte adaptations understood as departures from this balanced condition, pushed in opposite directions by how much water their habitat supplies.

Halophytes are plants able to tolerate the high salt concentrations of coastal and marine habitats — conditions ordinary land plants cannot survive. Their habitat is the muddy, tidally flooded margin of coasts and estuaries, where mangrove trees and their associated species grow; these are the land plants that can tolerate sea or marine salinity. The physiological challenge is specific: in an ordinary land habitat, plants absorb water because the surrounding soil water is less salty than their own cells, but in a saline coastal soil the surrounding water can be as salty as, or saltier than, the plant's own tissues, which would otherwise obstruct water uptake and risk excess salt entering the plant. …