Question

In which of the following gametophytes is not independent free living?
A.Pteris
B.Pinus
C.Funaria
D.Marchantia

Answer 1

Hint: In gymnosperms and angiosperms, the gametophytes are dependent on sporophyte. Gymnosperms are flowerless plants that produce cones and seeds. Angiosperms are vascular plants. They have stems, roots, and leaves.

Complete answer:In gymnosperms (like Pinus), the male and female gametophyte do not have an independent free-living existence. So They remain within the sporangia retained on the sporophytes that are female gametophyte (within megasporangium) and male gametophyte (within microsporangium). The gametophyte is a phase of the life cycle in which the gametes, the egg, and the sperm are produced. In bryophytes (Funaria and Marchantia) fertilization is dependent on water for the transfer of sperm to the egg The gametophyte is fertilized outside the body. Therefore, they have Independent free-living gametophytes In this respect Pteridophytes are similar to bryophytes they still have free-living gametophytes. Pinaceae (Pinus) has a well-developed gametophyte in which sperm cells are fertilized with egg cells within the ovule.
So option B is correct.

Note: Pinus have needle-shaped that remain on the trees throughout the whole year (evergreen plants). Pinus reproduce via cones, conically shaped structures that contain male and female sex organs. Pinus is a monoecious plant, which means that one plant produces individual male and female cones.