Question

Role of amphibious plants in evolution of land plants

Answer 1

"The origin of the sporophyte in land plants(Embryophytes) is a fundamentalevolutionary problem. ... In contrast, in allland plants, life cycle is constituted by an alternation of generations, the diploid sporophyte and the haploid gametophyte. The sporophyte does not form gametes but haploid spores by meiosis."

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Answer 2

Answer:

There are evidences that supports the fact that land plants are evolved from ancestor amphibious plants. Green algae being the primitive plants were transformed into mosses, ferns, conifers and other flowering plants. The primitive amphibious plants undergone with several adaptations to develop into land plants. The rigid cell walls were developed in order to develop bark like woody characteristics. In amphibious plants the translocation of water and minerals was directly from water. But later on in the course of evolution they developed a system of conducting vessels or tube like structures which were developed to transport materials up and down of the plant. True leaves, stems and roots were developed in order to support plant in different functions. In order to facilitate fertilization the gametophytic generation developed. Pollen (male gametophyte)  is adapted to use water as medium to reach female gametophyte. In amphibious plants a fertilized egg can develop into embryo inside the water to prevent embryo being dried but in the case of land plants embryo can dry out rapidly.