Question

The diploid sporophyte is represented by a dominant, independent , photosynthetic, vascular plant body. It alternates with multicellular, independent but Short -lived haploid gametophyte such pattern of life cycle is found in
A) Bryophytes
B) Bryophytes and pteridophytes
C) Gymnosperms and angiosperms
D) Pteridophytes

Answer 1

As we know sporophyte is the diploid multicellular stage in the life cycle of a plant or alga. It is developed from the zygote which is formed when a haploid egg cell is fertilized by haploid sperm and each sporophyte cell consists of a double set of chromosomes where one set is received from each parent.

Complete answer:
Pteridophytes like ferns and lycophytes are free-sporing vascular plants that have a life cycle with free-living gametophytes and also sporophyte phases which are independent at maturity. The body of the sporophyte is well differentiated into parts like roots, stem and leaves. The root system is always adventitious.
Pteridophytes are diploid terrestrial plants which have a well developed vascular system. The plants produce haploid spores by meiosis in sporangia. The sporangia are arranged in clusters along the abaxial margin of the leaf as in Adiantum , Nephrolepis etc or distinguished structures called strobilus in Selaginella. These spores germinate to produce haploid gametophytes which in turn give rise to male reproductive structures the antheridia and female structures called archegonia. The gametophytes can be monoecious or dioecious. The fusion of antherozoids from the antheridia and the egg from the archegonia results in the formation of the diploid zygote which eventually gives rise to a new diploid plant.

So, the correct answer is option D) which is Pteridophytes.

Note:
A pteridophyte is a vascular plant with xylem and phloem which releases spores. Since pteridophytes do not produce flowers or seeds, they are referred to as cryptogams which means that their means of reproduction is hidden. The stem is either underground or aerial.