Male and female gametophytes are independent and freeliving in (a) mustard (b) castor (c) Pinus (d) Sphagnum.
Option D Sphagnum is a bryophyte in which dominant phase or plant body is independent and free living gametophyte. The sporophyte is parasitic over gametophyte. In Pinus(a gymnosperm), mustard and castor (angiosperms), the main plant body is sporophytic. Gametophyte is highly reduced and is completely dependent on sporophyte.
